CN116516685B - Preparation method of physiological monitoring multifunctional sensor - Google Patents
Preparation method of physiological monitoring multifunctional sensor Download PDFInfo
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- CN116516685B CN116516685B CN202310424173.5A CN202310424173A CN116516685B CN 116516685 B CN116516685 B CN 116516685B CN 202310424173 A CN202310424173 A CN 202310424173A CN 116516685 B CN116516685 B CN 116516685B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 12
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- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 32
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- 238000000034 method Methods 0.000 claims abstract description 32
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 33
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- NJXWZWXCHBNOOG-UHFFFAOYSA-N 3,3-diphenylpropyl(1-phenylethyl)azanium;chloride Chemical compound [Cl-].C=1C=CC=CC=1C(C)[NH2+]CCC(C=1C=CC=CC=1)C1=CC=CC=C1 NJXWZWXCHBNOOG-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/02—Polyamines
- C08G73/026—Wholly aromatic polyamines
- C08G73/0266—Polyanilines or derivatives thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/07—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof
- D06M11/11—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof with halogen acids or salts thereof
- D06M11/13—Ammonium halides or halides of elements of Groups 1 or 11 of the Periodic System
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/07—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof
- D06M11/30—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof with oxides of halogens, oxyacids of halogens or their salts, e.g. with perchlorates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/184—Carboxylic acids; Anhydrides, halides or salts thereof
- D06M13/188—Monocarboxylic acids; Anhydrides, halides or salts thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/61—Polyamines polyimines
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
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- D06M2101/04—Vegetal fibres
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
Abstract
The invention provides a preparation method of a physiological monitoring multifunctional sensor, which comprises the following steps: sequentially obtaining cut lotus stems, preparing polyaniline solution, vacuum filtering, treating with concentrated ammonia water, drying, extracting, centrifugally homogenizing, soaking, airing and braiding wires. The preparation of polyaniline solution specifically comprises: aniline, concentrated hydrochloric acid and deionized water are placed in an ice bath for mixing and stirring, so as to obtain a solution A; then placing ammonium persulfate and deionized water in an ice bath for mixing and stirring to obtain a solution B; and finally, dropwise adding the solution B into the solution A in the stirring process of the solution A, and obtaining the polyaniline solution under the ice bath condition. The method adopts the biological material to obtain the multifunctional sensor, the raw material is degradable, flexible and nontoxic, and meanwhile, the raw material has wide sources, low cost and excellent performance, and is effectively used in the intelligent wearable field.
Description
Technical Field
The invention relates to the technical field of strain and gas sensing, in particular to a preparation method of a physiological monitoring multifunctional sensor.
Background
The sensor is a detection device which can sense the measured information and convert the sensed information into an electric signal or other information output in a required form according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like; the sensor has the characteristics of microminiaturization, digitalization, intellectualization, multifunction, systemization and networking, and is widely applied to the fields of food, agriculture, national defense, exhibition halls, medical operation, intelligent industry, vehicle engineering, aerospace and the like. Currently, sensors are generally classified into ten types of sensors, including thermosensitive elements, photosensitive elements, gas-sensitive elements, force-sensitive elements, magnetic-sensitive elements, humidity-sensitive elements, acoustic-sensitive elements, radiation-sensitive elements, color-sensitive elements, and taste-sensitive elements, according to their basic sensing functions.
Along with portability and intellectualization of electronic products, wearable electronic devices, soft robots, man-machine interaction and the like have played an important role in daily life of people; the traditional sensor takes rigid semiconductor materials, ceramic materials and the like as sensing elements, has large rigidity, fixed shape and poor stretching performance, and is difficult to meet the requirements of flexible stretchable equipment such as wearable electronic devices, soft robots, man-machine interaction and the like; thus, the production of flexible wearable sensing devices is an important concern in the field of wearable applications today. At present, flexible wearable sensing devices prepared on the market have the problems of complex process, high price, incapability of recycling, large volume, toxicity, inconvenient raw material exploration and the like, and greatly limit the application and development of the sensing devices in the field of wearable devices. How to obtain a flexible sensor which has excellent comprehensive performance, low cost, simple process, wide raw material sources, flexibility, no toxicity, simplicity and portability becomes the key point and the difficulty of the research of the wearable sensing device at present.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a preparation method of a physiological monitoring multifunctional sensor, which adopts biological materials to obtain the multifunctional sensor, has the advantages of degradable raw materials, flexibility, no toxicity, wide raw material sources, low cost and excellent performance; the multifunctional sensor obtained by the method has high response sensitivity to humidity and strain monitoring, can greatly shorten response/recovery time, has good air permeability, and is further effectively used in the intelligent wearable field.
The aim of the invention is achieved by the following technical scheme:
a preparation method of a physiological monitoring multifunctional sensor is characterized by comprising the following steps of: comprising the following steps: sequentially obtaining cut lotus stems, preparing polyaniline solution, vacuum filtering, treating with concentrated ammonia water, drying, extracting, centrifugally homogenizing, soaking, airing and braiding wires;
the preparation of the polyaniline solution specifically comprises the following steps: firstly, aniline, concentrated hydrochloric acid and deionized water are placed in an ice bath for mixing and stirring until the temperature of an ice-water mixture is reached, so as to obtain a solution A; then placing ammonium persulfate and deionized water in an ice bath for mixing and stirring until the temperature of the ice-water mixture to obtain a solution B; and finally, dropwise adding the solution B into the solution A in the stirring process of the solution A, and reacting under the ice bath condition to obtain the polyaniline solution.
Further optimizing, the obtaining of the cut lotus stems specifically comprises the following steps: firstly, washing the picked lotus stems with clear water; then, lightly scribing the lotus peduncles on the peduncles around the peduncles axis by a cutter (such as a craft knife); finally, breaking off the outer skin of the lotus peduncles and extracting the cut lotus peduncles.
In the preparation process of the polyaniline solution, aniline is distilled and purified by a rotary evaporator at the temperature of 90-100 ℃.
Further optimizing, wherein in the preparation process of the polyaniline solution, the volume ratio of aniline to concentrated hydrochloric acid to deionized water is 11-12:12-13:120-130, the stirring speed of the obtained solution A is 280-320 r/min, and the temperature of the ice-water mixture is 0-5 ℃; the mass ratio of ammonium persulfate to deionized water is 14-14.5:120-130, the stirring speed of the obtained solution B is 280-320 r/min, and the temperature of the ice-water mixture is 0-5 ℃; the dropping rate of the solution B into the solution A is 240-260 ml/h, the ice bath temperature is 0 ℃ and the time is 8h.
Further optimizing, the vacuum suction filtration and the treatment of the concentrated ammonia water are specifically as follows: firstly, carrying out vacuum suction filtration on a polyaniline solution, then adding pure water, uniformly stirring, repeating the above processes for a plurality of times, and completing the primary extraction of the polyaniline solution; then, putting the solid powder obtained by vacuum filtration into concentrated ammonia water, stirring at the speed of 280-320 r/min, stirring for 11-13 h, and then carrying out vacuum filtration extraction by deionized water until the pH value is neutral.
Further optimizing, the drying and extracting specifically comprises the following steps: sequentially treating the powder obtained after vacuum filtration and concentrated ammonia water treatment with aqueous solution of toluene and ethanol under the protection of nitrogen to obtain a mixed solution; then, the mixed solution is vacuum-dried at 38-42 ℃, and then ground into powder.
Preferably, the treatment time of the toluene and the ethanol water solution is respectively 34-38 hours; the volume ratio of toluene to ethanol water solution is 6-8:16-18; in the ethanol water solution, the volume ratio of ethanol to water is 9:1.
Further optimizing, the centrifugal homogenization is specifically as follows: adding the powder obtained after the drying and extraction into NMP (N-methyl pyrrolidone) solvent, and magnetically stirring on a magnetic stirrer to obtain a mixed solution C; and then, centrifuging the mixed solution C, and collecting supernatant after centrifugation to obtain polyaniline dispersion liquid.
Preferably, the mass ratio of NMP to powder obtained after drying and extraction is 4-4.6: 0.08 to 0.12.
Preferably, the magnetic stirring time is 46-50 h.
The person skilled in the art knows that when ammonium persulfate is used as an oxidant to prepare polyaniline, the polyaniline is in random particles, the polyaniline particles are easy to be clustered together, the arrangement of the polyaniline particles is extremely irregular, and meanwhile, the prepared polyaniline particles are basically free of holes. After the polyaniline solution is prepared by ammonium persulfate, the polyaniline solution is dedoped by vacuum suction filtration and concentrated ammonia water treatment, so that the pH value of the polyaniline solution is neutral, and the subsequent dissolution (namely, the dissolution process when NMP is used as a solvent) is prevented from being influenced by the fact that the polyaniline contains hydrogen ions (namely, is acidic); then, sequentially treating the toluene and the ethanol water solution to realize the removal of polyaniline with low polymerization degree in the polyaniline solution, and ensuring that the polyaniline with high polymerization degree is only contained in the solution, namely ensuring the purity of the polyaniline solution; and then NMP is utilized to dissolve the high-purity neutral polyaniline after vacuum drying, and the polyaniline is sequentially subjected to magnetic stirring centrifugation and supernatant removal, so that the polyaniline with high purity and high polymerization degree is obtained, and the problems of agglomeration and irregular arrangement of the polyaniline are effectively avoided.
Further optimizing, the soaking and airing steps are as follows: firstly, one end of the cut lotus stem fiber is grasped, and the other end of the cut lotus stem fiber swings back and forth in the polyaniline dispersion liquid, so that the polyaniline dispersion liquid is firstly coated at one end of the cut lotus stem fiber; then, releasing one end of the pinched cut lotus stem fiber, fully immersing the cut lotus stem fiber in the polyaniline dispersion liquid, positively stirring the polyaniline dispersion liquid at a first rotating speed, and reversely stirring the polyaniline dispersion liquid at a second rotating speed; and finally, taking out the soaked cut lotus stem fibers, and vertically hanging and naturally airing to obtain the composite cut lotus stem fibers.
Preferably, the swinging time is 1-2 min; the first rotating speed is 30-50 r/min, and the forward stirring time is 30-60 s; the second rotating speed is 60-80 r/min, and the reverse stirring time is 30-60 s.
After the polyaniline dispersion liquid with high purity and high polymerization degree contacts with the lotus root fibers rich in hydroxyl groups, a structure with the lotus root fibers as an inner core and the polyaniline as a shell layer is formed, and the polyaniline contacts with the lotus root fibers to form hydrogen bonds, so that the bonding property, namely the bonding property, between the polyaniline and the lotus root fibers is effectively improved; meanwhile, due to the wrapping of polyaniline, the problem of knotting and agglomeration among the cut lotus stem fibers is effectively avoided. In addition, through sectional soaking and forward and reverse stirring of the cut lotus stem fibers, one end of the cut lotus stem fibers is coated at first, the problems of knotting and agglomeration of the end are avoided, and then the traction of the other end is realized by matching the forward and reverse stirring of the coated end, so that the mutual knotting and agglomeration of the cut lotus stem fibers in the soaking process is effectively avoided. Finally, by means of vertical suspension and natural airing, the thickness and uniformity of polyaniline attached to the surfaces of the cut lotus stem fibers are ensured through the traction of hydrogen bonds, and further the softness and mechanical strength (namely toughness) of the cut lotus stem fabrics are ensured.
Further optimizing, the knitting of the wire is specifically as follows: firstly, twisting a plurality of composite lotus stem silk yarns into single silk yarns, and then knitting two silk yarns into a sensor fabric; and then, fumigating the sensor fabric by hypochlorous acid for 40-60 s, fumigating the sensor fabric by a mixture of concentrated hydrochloric acid and concentrated acetic acid for 1-2 min, and then, standing the sensor fabric for stabilization at room temperature under ventilation conditions for 22-26 h to obtain the flexible sensor material.
Preferably, the temperature of the hypochlorous acid fumigation is 45-55 ℃; the fumigating temperature of the mixture of the concentrated hydrochloric acid and the concentrated acetic acid is 30-50 ℃, wherein the volume ratio of the concentrated hydrochloric acid to the concentrated acetic acid is 2-3:0.8-0.9.
HCl and HClO produced after thermal decomposition by hypochlorous acid 3 Hole making and start doping are carried out on the shell structure polyaniline, namely the generated HClO is utilized 3 The oxidizing property of the polyaniline shell structure deprives electrons from the main chain of the polyaniline shell structure so as to generate holes, and HCl is utilized to carry out preliminary doping on the polyaniline shell structure after the holes are generated; then, by utilizing the coordination of the volatilized inorganic acid and the organic acid, firstly, the polyaniline shell structure is further doped, and electrons are moved to enable hydrogen ions to enter holes generated by the polyaniline, so that the polyaniline is protonated and converted into a salt structure, and the conductivity of the polyaniline is increased, secondly, the corrosion of the polyaniline shell by corrosive protonic acid is inhibited, the problems of holes, collapse and the like on the surface of the shell structure are avoided, and further, the performance, namely the conductivity of the cut lotus stem fibers is ensured.
Further optimized, the preparation method also comprises the preparation of the sensor, specifically: and fixing two high-purity copper wires on the upper and lower surfaces of the flexible sensor material at the farthest distance by using conductive silver paste to obtain the flexible fabric sensor.
The invention has the following technical effects:
the polyaniline solution is prepared, subjected to vacuum filtration and concentrated ammonia water treatment, dried, extracted and centrifugally homogenized, so that the problems that polyaniline is in random particle shape and easy to agglomerate together, is extremely irregular in arrangement, has no holes basically and the like when ammonium persulfate is used as an oxidant in the process of preparing the polyaniline solution are effectively solved, and the polyaniline with holes is obtained, wherein the polyaniline is high in purity and uniform; the hydrogen bond is formed between polyaniline and lotus root filaments in a soaking and compounding mode, so that the link between polyaniline and the lotus root filaments as biological materials is enhanced, and the problem of knotting and agglomeration of lotus root filaments in the soaking process is avoided; and then, firstly, starting by using hypochlorous acid, and then, volatilizing by using concentrated hydrochloric acid and concentrated acetic acid to carry out doping treatment, so that the overall conductivity of the fabric is improved. The polyaniline and cut lotus stem composite fabric prepared by the method has strong conductivity and high resolution; the proton exchange reaction between the polyaniline molecular chain and the water molecules can change the conductivity, and simultaneously, as the relative humidity is increased, the water molecules adsorbed by the polyaniline are increased, and free movement ions are also increased, so that the conductivity of the polyaniline is increased. The polyaniline and cut lotus stem composite fabric surface has hydrophilic hydroxyl groups and permeable gaps, and necessary pore channels are provided for water molecules, so that the sensor has good linear change and resolution on humidity.
The flexible sensor obtained by the application has the sensitivity of 0.3kPa in the range of 0 to 1.5kPa -1 After long-term test, the response is not obviously reduced, and the response time and the recovery time of the sensor are extremely short; the flexible sensor obtained by the application has high stability, good comfort, air permeability and long-term wearability, and has wide application prospects in the aspects of physiological index detection, health care, artificial skin and the like.
Drawings
Fig. 1 is an XRD pattern of polyaniline powder prepared in the embodiments of the present application.
Fig. 2 is an SEM image of polyaniline powder prepared in the embodiments of the present application.
Fig. 3 is an SEM image of lotus stalk fibers prepared in embodiments of the present application.
Fig. 4 is an SEM image of a composite cut lotus stem thread prepared in an embodiment of the present application.
FIG. 5 is a plot of sensitivity of a flexible sensor prepared in embodiments of the present application over a pressure range of 0-20 kPa.
FIG. 6 is a graph of cyclic test curves for flexible sensors prepared in embodiments of the present application at various pressures.
FIG. 7 is a graph of repeatability and durability testing of flexible sensors prepared according to embodiments of the present application under a pressure of 4 kPa.
Fig. 8 is a graph of pulse recordings of a flexible sensor prepared in an embodiment of the present application versus a volunteer.
Fig. 9 is a graph of a flexible sensor prepared in an embodiment of the present application for 30 °, 60 °, 90 ° of index finger movement.
FIG. 10 is a graph of dynamic current variation for different relative humidities under a nitrogen atmosphere for a flexible sensor prepared in an embodiment of the present application.
FIG. 11 is a graph of flexible sensor current versus RH% response prepared in embodiments of the present application.
FIG. 12 is a graph of dynamic current variation for different relative humidities in an air background for a flexible sensor prepared in an embodiment of the present application; wherein the inset is the response time and recovery time at 43.3% RH.
Fig. 13 is a graph of flexible sensor current vs RH% response prepared in an embodiment of the present application.
FIG. 14 is a graph of a flexible sensor repeatability performance test at 43.7% RH for a flexible sensor prepared according to embodiments of the present application.
Fig. 15 is a breath test graph of a flexible sensor prepared in an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
a preparation method of a physiological monitoring multifunctional sensor is characterized by comprising the following steps of: comprising the following steps: sequentially obtaining cut lotus stems, preparing polyaniline solution, vacuum filtering, treating with concentrated ammonia water, drying, extracting, centrifugally homogenizing, soaking, airing and braiding wires;
the method for obtaining the cut lotus stems specifically comprises the following steps: firstly, washing the picked lotus stems with clear water; then, lightly scribing the lotus peduncles (specifically, the position of 5cm at one end of the lotus peduncles) on the lotus peduncles by a cutter (such as an art designer) around the peduncles axis for one circle; finally, breaking off the outer skin of the lotus peduncles, extracting the cut lotus peduncles, and flatly placing the extracted cut lotus peduncles on a tabletop covered by the preservative film for standby.
The preparation of polyaniline solution specifically comprises: firstly, distilling and purifying 100ml of aniline at 90 ℃ by using a rotary evaporator, then placing aniline, concentrated hydrochloric acid and deionized water into an ice bath for mixing and stirring to obtain a solution A, wherein the volumes of the aniline, the concentrated hydrochloric acid and deionized water are respectively 11ml, 12ml and 120ml, the stirring speed is 280r/min, and the temperature of the ice-water mixture is 1 ℃. And then placing ammonium persulfate and deionized water into an ice bath for mixing and stirring until the temperature of the ice-water mixture is reached, so as to obtain a solution B, wherein the mass and the volume of the ammonium persulfate and the deionized water are respectively 14g and 120ml, the stirring speed of the solution B is 280r/min, and the temperature of the ice-water mixture is 1 ℃. Finally, in the stirring process of the solution A, the solution B is dropwise added into the solution A, the dropwise adding rate is 240ml/h, and the reaction is carried out under the ice bath condition, so that the polyaniline solution is obtained, and the ice bath temperature is 0 ℃ and the time is 8h.
The vacuum suction filtration and the concentrated ammonia water treatment are specifically as follows: firstly, carrying out vacuum suction filtration on a polyaniline solution, then, uniformly stirring the solution into pure water, and repeating the above processes for a plurality of times (the times are determined according to actual conditions) to finish the primary extraction of the polyaniline solution; then, the solid powder obtained by vacuum filtration is put into concentrated ammonia water, and stirred at the speed of 280r/min, and after stirring for 11h, 4L of deionized water is used for vacuum filtration extraction until the pH value is neutral.
The drying and extracting steps are as follows: the powder obtained after vacuum filtration and concentrated ammonia water treatment is treated with aqueous solution of toluene and ethanol in sequence under the protection of nitrogen, so as to obtain mixed solution, which is specifically as follows: firstly, 60ml of toluene is used for treatment for 34 hours, and then 160ml of ethanol aqueous solution is used for treatment for 34 hours, wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 9:1; then, the mixed solution was vacuum-dried at 38 ℃, and then ground into powder.
The centrifugal homogenization is specifically as follows: adding the powder obtained after drying and extraction into NMP (N-methyl pyrrolidone) solvent, wherein the volumes and the masses of the NMP and the powder obtained after drying and extraction are respectively as follows: 7.78ml and 0.16g, and magnetically stirring the mixture on a magnetic stirrer for 46 hours to obtain a mixed solution C; and then, centrifuging the mixed solution C, and collecting supernatant after centrifugation to obtain polyaniline dispersion liquid.
The soaking and airing steps are as follows: firstly, one end of the cut lotus stem fiber is grasped, the other end of the cut lotus stem fiber swings back and forth in the polyaniline dispersion liquid for 1min, and the polyaniline dispersion liquid is firstly coated at one end of the cut lotus stem fiber; then, releasing one end of the pinched cut lotus stem fiber, fully immersing the cut lotus stem fiber in the polyaniline dispersion liquid, firstly positively stirring the polyaniline dispersion liquid at 30r/min for 60s, and then reversely stirring the polyaniline dispersion liquid at 60r/min for 60s; and finally, taking out the soaked cut lotus stem fibers, and vertically hanging and naturally airing to obtain the composite cut lotus stem fibers.
The knitting of the wire is specifically as follows: firstly, twisting a plurality of composite lotus stem silk yarns into single silk yarns, and then knitting two silk yarns into a sensor fabric; then, the sensor fabric is smoked by hypochlorous acid for 40 seconds at the smoking temperature of 45 ℃, then is smoked by a mixture of concentrated hydrochloric acid and concentrated acetic acid for 1min at the smoking temperature of 30 ℃, wherein the volume ratio of the concentrated hydrochloric acid to the concentrated acetic acid is 2:0.8, and is then placed under the room temperature and ventilation condition for stabilization for 22 hours, and the flexible sensor material is obtained.
Example 2:
a preparation method of a physiological monitoring multifunctional sensor is characterized by comprising the following steps of: comprising the following steps: sequentially obtaining cut lotus stems, preparing polyaniline solution, vacuum filtering, treating with concentrated ammonia water, drying, extracting, centrifugally homogenizing, soaking, airing and braiding wires;
the method for obtaining the cut lotus stems specifically comprises the following steps: firstly, washing the picked lotus stems with clear water; then, lightly scribing the lotus peduncles (specifically, the position of 5cm at one end of the lotus peduncles) on the lotus peduncles by a cutter (such as an art designer) around the peduncles axis for one circle; finally, breaking off the outer skin of the lotus peduncles, extracting the cut lotus peduncles, and flatly placing the extracted cut lotus peduncles on a tabletop covered by the preservative film for standby.
The preparation of polyaniline solution specifically comprises: firstly, distilling and purifying 100ml of aniline by using a rotary evaporator at 95 ℃, then placing aniline, concentrated hydrochloric acid and deionized water into an ice bath for mixing and stirring to obtain solution A, wherein the volumes of the aniline, the concentrated hydrochloric acid and deionized water are respectively 11.4ml, 12.5ml and 125ml, the stirring speed is 300r/min, and the temperature of the ice water mixture is 3 ℃. And then placing ammonium persulfate and deionized water into an ice bath for mixing and stirring until the temperature of the ice-water mixture is reached, so as to obtain a solution B, wherein the mass and the volume of the ammonium persulfate and the deionized water are respectively 14.25g and 125ml, the stirring speed of the solution B is 300r/min, and the temperature of the ice-water mixture is 3 ℃. Finally, in the stirring process of the solution A, the solution B is dropwise added into the solution A, the dropwise adding rate is 250ml/h, and the reaction is carried out under the ice bath condition, so that the polyaniline solution is obtained, and the ice bath temperature is 0 ℃ and the time is 8h.
The vacuum suction filtration and the concentrated ammonia water treatment are specifically as follows: firstly, carrying out vacuum suction filtration on a polyaniline solution, then, uniformly stirring the solution into pure water, and repeating the above processes for a plurality of times (the times are determined according to actual conditions) to finish the primary extraction of the polyaniline solution; then, the solid powder obtained by vacuum filtration is put into concentrated ammonia water, and stirred at the speed of 300r/min, and after stirring for 12 hours, the solid powder is extracted by vacuum filtration by 5L of deionized water until the pH value is neutral.
The drying and extracting steps are as follows: the powder obtained after vacuum filtration and concentrated ammonia water treatment is treated with aqueous solution of toluene and ethanol in sequence under the protection of nitrogen, so as to obtain mixed solution, which is specifically as follows: firstly, 70ml of toluene is used for treatment for 36 hours, and then 170ml of ethanol aqueous solution is used for treatment for 36 hours, wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 9:1; then, the mixed solution was vacuum-dried at 40 ℃, and then ground into powder.
The centrifugal homogenization is specifically as follows: the powder obtained after the drying and extraction is added into NMP (N-methyl pyrrolidone) solvent, and the volumes and the masses of the NMP and the powder obtained after the drying and extraction are respectively 8ml:0.2g, and magnetically stirring on a magnetic stirrer for 48 hours to obtain a mixed solution C; and then, centrifuging the mixed solution C, and collecting supernatant after centrifugation to obtain polyaniline dispersion liquid.
The soaking and airing steps are as follows: firstly, one end of the cut lotus stem fiber is grasped, the other end of the cut lotus stem fiber swings back and forth in the polyaniline dispersion liquid for 1.5min, and the polyaniline dispersion liquid is firstly coated at one end of the cut lotus stem fiber; then, releasing one end of the pinched cut lotus stem fiber, fully immersing the cut lotus stem fiber in the polyaniline dispersion liquid, firstly positively stirring the polyaniline dispersion liquid at 40r/min for 45s, and then reversely stirring the polyaniline dispersion liquid at 70r/min for 45s; and finally, taking out the soaked cut lotus stem fibers, and vertically hanging and naturally airing to obtain the composite cut lotus stem fibers.
The knitting of the wire is specifically as follows: firstly, twisting a plurality of composite lotus stem silk yarns into single silk yarns, and then knitting two silk yarns into a sensor fabric; and then, fumigating the sensor fabric with hypochlorous acid for 50s at 50 ℃, fumigating with a mixture of concentrated hydrochloric acid and concentrated acetic acid for 1.5min at 40 ℃, wherein the volume ratio of the concentrated hydrochloric acid to the concentrated acetic acid is 2.5:0.85, and then, standing for stabilization at room temperature under ventilation conditions for 24 hours to obtain the flexible sensor material.
Example 3:
a preparation method of a physiological monitoring multifunctional sensor is characterized by comprising the following steps of: comprising the following steps: sequentially obtaining cut lotus stems, preparing polyaniline solution, vacuum filtering, treating with concentrated ammonia water, drying, extracting, centrifugally homogenizing, soaking, airing and braiding wires;
the method for obtaining the cut lotus stems specifically comprises the following steps: firstly, washing the picked lotus stems with clear water; then, lightly scribing the lotus peduncles (specifically, the position of 5cm at one end of the lotus peduncles) on the lotus peduncles by a cutter (such as an art designer) around the peduncles axis for one circle; finally, breaking off the outer skin of the lotus peduncles, extracting the cut lotus peduncles, and flatly placing the extracted cut lotus peduncles on a tabletop covered by the preservative film for standby.
The preparation of polyaniline solution specifically comprises: firstly, distilling and purifying 100ml of aniline by using a rotary evaporator at 100 ℃, then placing aniline, concentrated hydrochloric acid and deionized water into an ice bath for mixing and stirring to obtain a solution A, wherein the volumes of the aniline, the concentrated hydrochloric acid and deionized water are respectively 12ml, 13ml and 130ml, the stirring speed is 320r/min, and the temperature of the ice-water mixture is 5 ℃. And then placing ammonium persulfate and deionized water into an ice bath for mixing and stirring until the temperature of the ice-water mixture is reached, so as to obtain a solution B, wherein the mass and the volume of the ammonium persulfate and the deionized water are respectively 14.5g and 130ml, the stirring speed of the solution B is 320r/min, and the temperature of the ice-water mixture is 5 ℃. Finally, in the stirring process of the solution A, the solution B is dropwise added into the solution A, the dropwise adding rate is 260ml/h, and the reaction is carried out under the ice bath condition, so that the polyaniline solution is obtained, and the ice bath temperature is 0 ℃ and the time is 8h.
The vacuum suction filtration and the concentrated ammonia water treatment are specifically as follows: firstly, carrying out vacuum suction filtration on a polyaniline solution, then, uniformly stirring the solution into pure water, and repeating the above processes for a plurality of times (the times are determined according to actual conditions) to finish the primary extraction of the polyaniline solution; then, the solid powder obtained by vacuum filtration is put into concentrated ammonia water, and stirred at the speed of 320r/min, and after stirring for 13h, 6L deionized water is used for vacuum filtration extraction until the pH value is neutral.
The drying and extracting steps are as follows: the powder obtained after vacuum filtration and concentrated ammonia water treatment is treated with aqueous solution of toluene and ethanol in sequence under the protection of nitrogen, so as to obtain mixed solution, which is specifically as follows: firstly, 80ml of toluene is used for treatment for 38 hours, and then 180ml of ethanol aqueous solution is used for treatment for 38 hours, wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 9:1; then, the mixed solution was vacuum-dried at 42 ℃, and then ground into powder.
The centrifugal homogenization is specifically as follows: adding the powder obtained after drying and extraction into NMP (N-methylpyrrolidone) solvent, wherein the volumes and the masses of the NMP and the powder obtained after drying and extraction are 8.9ml and 0.24g respectively, and magnetically stirring on a magnetic stirrer for 50 hours to obtain a mixed solution C; and then, centrifuging the mixed solution C, and collecting supernatant after centrifugation to obtain polyaniline dispersion liquid.
The soaking and airing steps are as follows: firstly, one end of the cut lotus stem fiber is grasped, the other end of the cut lotus stem fiber swings back and forth in the polyaniline dispersion liquid for 2 minutes, and the polyaniline dispersion liquid is firstly coated at one end of the cut lotus stem fiber; then, releasing one end of the pinched cut lotus stem fiber, fully immersing the cut lotus stem fiber in the polyaniline dispersion liquid, firstly positively stirring the polyaniline dispersion liquid for 30s at 50r/min, and then reversely stirring the polyaniline dispersion liquid for 30s at 80 r/min; and finally, taking out the soaked cut lotus stem fibers, and vertically hanging and naturally airing to obtain the composite cut lotus stem fibers.
The knitting of the wire is specifically as follows: firstly, twisting a plurality of composite lotus stem silk yarns into single silk yarns, and then knitting two silk yarns into a sensor fabric; then, the sensor fabric is firstly smoked by hypochlorous acid for 60 seconds at the smoking temperature of 55 ℃, then is smoked by a mixture of concentrated hydrochloric acid and concentrated acetic acid for 2 minutes at the smoking temperature of 50 ℃, wherein the volume ratio of the concentrated hydrochloric acid to the concentrated acetic acid is 3:0.9, and is then placed under the room temperature and ventilation condition for stabilization for 26 hours, so that the flexible sensor material is obtained.
Example 4:
as a further optimization of the scheme of the application, on the premise of any one of examples 1 to 3, the preparation method further comprises the preparation of the sensor, specifically: and fixing two high-purity copper wires with diameters of 0.15mm at the farthest distance between the upper surface and the lower surface of the flexible sensor material by using conductive silver paste to obtain the portable humidity and pressure sensing dual-function breathable flexible fabric sensor.
Comparative example 1:
a preparation method of a physiological monitoring multifunctional sensor is characterized by comprising the following steps of: comprising the following steps: sequentially obtaining cut lotus stems, preparing polyaniline solution, vacuum filtering, treating with concentrated ammonia water, drying, extracting, centrifugally homogenizing, soaking, airing and braiding wires;
the method for obtaining the cut lotus stems specifically comprises the following steps: firstly, washing the picked lotus stems with clear water; then, lightly scribing the lotus peduncles (specifically, the position of 5cm at one end of the lotus peduncles) on the lotus peduncles by a cutter (such as an art designer) around the peduncles axis for one circle; finally, breaking off the outer skin of the lotus peduncles, extracting the cut lotus peduncles, and flatly placing the extracted cut lotus peduncles on a tabletop covered by the preservative film for standby.
The preparation of polyaniline solution specifically comprises: firstly, distilling and purifying 100ml of aniline by using a rotary evaporator at 95 ℃, then placing aniline, concentrated hydrochloric acid and deionized water into an ice bath for mixing and stirring to obtain solution A, wherein the volumes of the aniline, the concentrated hydrochloric acid and deionized water are respectively 11.4ml, 12.5ml and 125ml, the stirring speed is 300r/min, and the temperature of the ice water mixture is 3 ℃. And then placing ammonium persulfate and deionized water into an ice bath for mixing and stirring until the temperature of the ice-water mixture is reached, so as to obtain a solution B, wherein the mass and the volume of the ammonium persulfate and the deionized water are respectively 14.25g and 125ml, the stirring speed of the solution B is 300r/min, and the temperature of the ice-water mixture is 3 ℃. Finally, in the stirring process of the solution A, the solution B is dropwise added into the solution A, the dropwise adding rate is 250ml/h, and the reaction is carried out under the ice bath condition, so that the polyaniline solution is obtained, and the ice bath temperature is 0 ℃ and the time is 8h.
The vacuum suction filtration and the concentrated ammonia water treatment are specifically as follows: firstly, carrying out vacuum suction filtration on a polyaniline solution, then, uniformly stirring the solution into pure water, and repeating the above processes for a plurality of times (the times are determined according to actual conditions) to finish the primary extraction of the polyaniline solution; then, the solid powder obtained by vacuum filtration is put into concentrated ammonia water, and stirred at the speed of 300r/min, and after stirring for 12 hours, the solid powder is extracted by vacuum filtration by 5L of deionized water until the pH value is neutral.
The drying and extracting steps are as follows: the powder obtained after vacuum filtration and concentrated ammonia water treatment is treated with aqueous solution of toluene and ethanol in sequence under the protection of nitrogen, so as to obtain mixed solution, which is specifically as follows: firstly, 70ml of toluene is used for treatment for 36 hours, and then 170ml of ethanol aqueous solution is used for treatment for 36 hours, wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 9:1; then, the mixed solution was vacuum-dried at 40 ℃, and then ground into powder.
The centrifugal homogenization is specifically as follows: the powder obtained after the drying and extraction is added into NMP (N-methyl pyrrolidone) solvent, and the volumes and the masses of the NMP and the powder obtained after the drying and extraction are respectively 8ml:0.2g, and magnetically stirring on a magnetic stirrer for 48 hours to obtain a mixed solution C; and then, centrifuging the mixed solution C, and collecting supernatant after centrifugation to obtain polyaniline dispersion liquid.
The soaking and airing steps are as follows: firstly, one end of the cut lotus stem fiber is grasped, the other end of the cut lotus stem fiber swings back and forth in the polyaniline dispersion liquid for 1.5min, and the polyaniline dispersion liquid is firstly coated at one end of the cut lotus stem fiber; then, releasing one end of the pinched cut lotus stem fiber, fully immersing the cut lotus stem fiber in the polyaniline dispersion liquid, firstly positively stirring the polyaniline dispersion liquid at 40r/min for 45s, and then reversely stirring the polyaniline dispersion liquid at 70r/min for 45s; and finally, taking out the soaked cut lotus stem fibers, and vertically hanging and naturally airing to obtain the composite cut lotus stem fibers.
The knitting of the wire is specifically as follows: firstly, twisting a plurality of composite lotus stem silk yarns into single silk yarns, and then knitting two silk yarns into a sensor fabric; then, the concentrated hydrochloric acid is smoked for 2min, the smoking temperature is 40 ℃, and the flexible sensor material is obtained after the concentrated hydrochloric acid is placed under the conditions of room temperature and ventilation for stabilization for 24 h.
The flexible sensor materials of example 2 and comparative example 1 were tested for conductivity, response time, and recovery time, respectively, with the conductivity of example 2 being significantly higher than that of comparative example 1, and the response time of example 2 being 150ms and the recovery time being 120ms being significantly shorter than that of comparative example 1, 640ms, and 620ms. Meanwhile, the flexible sensor material prepared in the comparative example 1 is subjected to electron microscope scanning, and obvious holes exist on the surface of the flexible sensor material, so that the flexible sensor material is proved to be etched by corrosive hydrochloric acid.
In the preparation process of the embodiment 2, a ZQ-900 universal tensile tester is adopted to compress a sensing device, and then an electrochemical workstation is connected to record signals in real time; secondly, connecting a SenSit Smart U disk type electrochemical analyzer with PSTouch software on a mobile phone to monitor physiological movements of a human body such as respiration, joint bending, pulse and the like in real time; humidity testing of the device is performed by a self-assembled humidity testing platform.
The pressure response is defined as:wherein: i 0 Indicating the initial current without external pressure, I indicating the current after pressure is applied; sensitivity is defined as: />Wherein: delta is equal to the real-time current value I minus the initial current value I 0 ，/>The relative current change is indicated, and Δp is the amount of change in pressure. The response time is the time required by the current signal to reach 90% of the stable output value; similarly, recovery time refers to the time for the current value to reach 90% of the total resistance change.
Testing of sensing performance at different pressures: as shown in FIG. 5, the sensor is more sensitive to low pressure (0-1.5 kPa), and the sensitivity is 0.3kPa -1 . Cycle stability test: the fabric sensor prepared by the present application has repeatability under different pressures and durability tests under long-term circulation as shown in fig. 6 and 7, respectively, and it can be clearly seen that the sensor of the present application exhibits excellent stability. Physiological exercise testing: the fabric sensor has high recognition degree on different physiological movements, and test record curves are shown in fig. 8 and 9. Testing of intrinsic humidity Performance: the fabric sensor prepared by the method has good linearity and discrimination of humidity response in the nitrogen protection background, as shown in fig. 10 and 11. Humidity response performance test under air conditions: the fabric sensor of the present application has excellent discrimination and linearity for a wide range of humidity responses in a normal gas (air) background, as shown in fig. 12 and 13. Stability test: fabric transfer of the present applicationThe sensor has good stability against air background as shown in fig. 14. Breath test: the fabric sensor of the present application may be used to identify different breaths, as shown in fig. 15.
To sum up: the cut lotus stem fabric has the advantages of excellent air permeability, skin compatibility, light weight and the like as a flexible substrate; the sensitivity of the flexible sensor can reach 0.3kPa within the range of 0-1.5kPa -1 The method comprises the steps of carrying out a first treatment on the surface of the In addition, the sensor has good linearity and discrimination degree (22.8% -70.5% RH) on the intrinsic response of humidity under the background of nitrogen protection; in the air environment, the sensor has good recognition degree to the range of 19.6-66.8% RH, extremely short response time and recovery time and reliable stability.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A preparation method of a physiological monitoring multifunctional sensor is characterized by comprising the following steps of: comprising the following steps: sequentially obtaining cut lotus stems, preparing polyaniline solution, vacuum filtering, treating with concentrated ammonia water, drying, extracting, centrifugally homogenizing, soaking, airing and braiding wires;
the preparation of the polyaniline solution specifically comprises the following steps: firstly, aniline, concentrated hydrochloric acid and deionized water are placed in an ice bath for mixing and stirring until the temperature of an ice-water mixture is reached, so as to obtain a solution A; then placing ammonium persulfate and deionized water in an ice bath for mixing and stirring until the temperature of the ice-water mixture to obtain a solution B; finally, dropwise adding the solution B into the solution A in the stirring process of the solution A, and reacting under the ice bath condition to obtain a polyaniline solution;
the vacuum suction filtration and the treatment of the concentrated ammonia water are specifically as follows: firstly, carrying out vacuum suction filtration on a polyaniline solution, then adding pure water, uniformly stirring, repeating the above processes for a plurality of times, and completing the primary extraction of the polyaniline solution; then, putting the solid powder obtained by vacuum filtration into concentrated ammonia water, stirring at the speed of 280-320 r/min, stirring for 11-13 h, and then carrying out vacuum filtration extraction by deionized water until the pH value is neutral;
the drying and extracting steps are specifically as follows: sequentially treating the powder obtained after vacuum filtration and concentrated ammonia water treatment with aqueous solution of toluene and ethanol under the protection of nitrogen to obtain a mixed solution; then, carrying out vacuum drying on the mixed solution at 38-42 ℃, and grinding into powder;
the centrifugal homogenization is specifically as follows: adding the powder obtained after the drying and extraction into NMP solvent, and magnetically stirring on a magnetic stirrer to obtain mixed solution C; then, centrifuging the mixed solution C, and collecting supernatant after centrifugation to obtain polyaniline dispersion liquid;
the soaking and airing steps are specifically as follows: the soaking and airing steps are specifically as follows: firstly, one end of the cut lotus stem fiber is grasped, and the other end of the cut lotus stem fiber swings back and forth in the polyaniline dispersion liquid, so that the polyaniline dispersion liquid is firstly coated at one end of the cut lotus stem fiber; then, releasing one end of the pinched cut lotus stem fiber, fully immersing the cut lotus stem fiber in the polyaniline dispersion liquid, positively stirring the polyaniline dispersion liquid at a first rotating speed, and reversely stirring the polyaniline dispersion liquid at a second rotating speed; finally, taking out the soaked cut lotus root fibers, and vertically hanging and naturally airing to obtain the composite cut lotus root fibers;
the wire braiding is specifically as follows: firstly, twisting a plurality of composite lotus stem silk yarns into single silk yarns, and then knitting two silk yarns into a sensor fabric; and then, fumigating the sensor fabric by hypochlorous acid for 40-60 s, fumigating the sensor fabric by a mixture of concentrated hydrochloric acid and concentrated acetic acid for 1-2 min, and then, standing the sensor fabric for stabilization at room temperature under ventilation conditions for 22-26 h to obtain the flexible sensor material.
2. The method for preparing the physiological monitor multifunctional sensor according to claim 1, wherein the method comprises the following steps: the cut lotus stems are obtained specifically as follows: firstly, washing the picked lotus stems with clear water; then, lightly scratching the lotus peduncles on the peduncles around the peduncles axis by a cutter; finally, breaking off the outer skin of the lotus peduncles and extracting the cut lotus peduncles.
3. A method for preparing a physiological monitor multifunctional sensor according to claim 1 or 2, characterized in that: in the preparation process of the polyaniline solution, aniline is distilled and purified by a rotary evaporator at the temperature of 90-100 ℃.
4. A method for preparing a physiological monitor multifunctional sensor according to claim 3, characterized in that: in the preparation process of the polyaniline solution, the volume ratio of aniline to concentrated hydrochloric acid to deionized water is 11-12:12-13:120-130, the stirring rotation speed of the obtained solution A is 280-320 r/min, and the temperature of an ice-water mixture is 0-5 ℃; the mass ratio of ammonium persulfate to deionized water is 14-14.5:120-130, the stirring speed of the obtained solution B is 280-320 r/min, and the temperature of the ice-water mixture is 0-5 ℃; the dropping rate of the solution B into the solution A is 240-260 ml/h, the ice bath temperature is 0 ℃ and the time is 8h.
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