CN107290389B - Gas-sensitive material for detecting low-concentration formaldehyde at room temperature, preparation method thereof and gas-sensitive sensor - Google Patents
Gas-sensitive material for detecting low-concentration formaldehyde at room temperature, preparation method thereof and gas-sensitive sensor Download PDFInfo
- Publication number
- CN107290389B CN107290389B CN201710439435.XA CN201710439435A CN107290389B CN 107290389 B CN107290389 B CN 107290389B CN 201710439435 A CN201710439435 A CN 201710439435A CN 107290389 B CN107290389 B CN 107290389B
- Authority
- CN
- China
- Prior art keywords
- gas
- metal
- composite material
- sensitive material
- room temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
Abstract
The invention provides a gas-sensitive material for detecting low-concentration formaldehyde at room temperature, which comprises the following components in part by weight: the ternary composite material comprises noble metal, metal oxide and functionalized graphene, wherein the molar ratio of the metal oxide to the noble metal is 0.2-5, and the mass of the functionalized graphene is 15-50% of the sum of the mass of the metal oxide and the mass of the noble metal; or the ternary composite material of the noble metal, the metal hydroxide and the functionalized graphene, wherein the molar ratio of the metal hydroxide to the noble metal is 0.2-5, and the mass of the functionalized graphene is 15-50% of the sum of the mass of the metal hydroxide and the mass of the noble metal. Compared with the traditional metal oxide gas-sensitive material, the gas-sensitive material and the gas-sensitive sensor containing the gas-sensitive material do not need a high-temperature working environment, greatly reduce the power consumption and save resources. The material required on each sensor substrate is less, so the material cost is relatively lower, and the industrial implementation of the formaldehyde gas sensor can be facilitated.
Description
Technical Field
The invention relates to the technical field of gas sensors, in particular to a gas-sensitive material for detecting low-concentration formaldehyde at room temperature, a preparation method thereof and a gas sensor.
Background
Along with the improvement of living standard of people and the transformation of requirements of people on furniture environment decoration, the problem of indoor air quality is increasingly outstanding, and main indoor polluted gases after home decoration are formaldehyde and benzene series. Inhalation of high concentrations of formaldehyde gas can cause significant harm to humans, such as headache, nausea, cough, and gastrointestinal dysfunction. According to the related studies, if the concentration of formaldehyde gas in the room exceeds about 10 times of the national standard for formaldehyde concentration in the room, the person in the room is equivalent to chronic suicide. Therefore, the detection of formaldehyde in indoor air has great significance for protecting human health and environmental protection.
The traditional formaldehyde detection methods are many, but most of formaldehyde gas sensors mainly use electrochemical measurement, and the traditional sensors have the defects of poor accuracy, poor selectivity, large volume and the like. And the existing high-sensitivity formaldehyde gas sensors need to detect under the heating condition, so that the power consumption is high, and the development of the sensors with low power consumption, small element size, long service life and low price becomes very significant.
Disclosure of Invention
One object of the present invention is to provide a gas-sensitive material for detecting low-concentration formaldehyde at room temperature, wherein the gas-sensitive material is:
the ternary composite material comprises a noble metal, a metal oxide and functionalized graphene, wherein the molar ratio of the metal oxide to the noble metal is 0.2-5, and the mass of the functionalized graphene is 15-50% of the sum of the mass of the metal oxide and the mass of the noble metal; or
The ternary composite material comprises a noble metal, a metal hydroxide and functionalized graphene, wherein the molar ratio of the metal hydroxide to the noble metal is 0.2-5, and the mass of the functionalized graphene is 15-50% of the sum of the mass of the metal hydroxide and the mass of the noble metal;
wherein the gas-sensitive material can detect the formaldehyde gas with the concentration of ppb level at room temperature.
Further, the noble metal is Pt, Au or Pd metal;
wherein the metal oxide is nickel oxide, iron oxide, cobalt oxide, manganese oxide or tin oxide.
Further, the gas sensing material is a Pt-NiO-RGO ternary composite material, wherein the molar ratio of NiO to Pt is 0.6-0.8, and the mass of RGO is 20-30% of the sum of the masses of NiO and Pt.
Further, the gas-sensitive material is Pt-Ni (OH)2-RGO ternary composite wherein Ni (OH)2And Pt in a molar ratio of 0.5 to 1, the mass of RGO being Ni (OH)2And 25-28% of the sum of the mass of Pt.
Particularly, the invention also provides a preparation method of the gas-sensitive material for detecting low-concentration formaldehyde at room temperature, which comprises the following steps:
providing graphene oxide powder;
dispersing the graphene powder in an organic solvent, and adding a metal salt solution and hydroxide ion type alkali to react to obtain a metal hydroxide and graphene oxide composite material;
dispersing the metal hydroxide and graphene oxide composite material in an organic solvent, and adding a noble metal precursor solution and a reducing agent to react to obtain a noble metal, metal hydroxide and functionalized graphene ternary composite material;
or further comprising the steps of:
and annealing the ternary composite material of the noble metal, the metal hydroxide and the functionalized graphene to obtain the ternary composite material of the noble metal, the metal oxide and the functionalized graphene.
Further, the reaction conditions of the metal hydroxide and graphene oxide composite material are as follows: heating to 30-120 deg.C in oil bath, and stirring for 2-18 h.
Further, the reaction conditions of the ternary composite material of the noble metal, the metal hydroxide and the functionalized graphene are as follows: carrying out reaction in microwave, wherein the power of the microwave is 450-900W, and the reaction time is 30-180 s.
In particular, the present invention also provides a gas sensor for detecting low-concentration formaldehyde at room temperature, comprising:
a substrate;
at least two electrodes formed at a surface of the substrate; and
the gas-sensitive material of any one of claims 1-4, which is applied to a surface of the substrate and at least partially covers the at least two electrodes, such that the at least two electrodes are conductive;
wherein the gas sensor can detect the formaldehyde gas with the concentration of ppb level at room temperature.
Further, the substrate is selected from one of a PCB board, a silicon substrate, and a ceramic substrate.
Further, the electrode is prepared from a metal or alloy film;
wherein the metal is selected from one of Pt, Au, Ag, Cu, Al, Ni and W, and the alloy thin film is selected from one of Ni/Cr, Mo/Mn, Cu/Zn, Ag/Pd, Pt/Au and Fe/Co.
The gas sensor of the invention belongs to a semiconductor type gas sensor, namely a metal oxide sensor, which is a detection element made of metal oxide materials. The sensor detects gas by interacting with gas to generate surface adsorption or oxidation-reduction reaction, and causing carrier movement as characteristic conductivity or volt-ampere characteristic or surface potential change to measure gas concentration.
According to the scheme, the inventor finds that when the ternary composite material of the noble metal, the metal oxide and the functionalized graphene or the ternary composite material of the noble metal, the metal hydroxide and the functionalized graphene is used as the formaldehyde gas-sensitive material through a large amount of experimental researches, particularly when the gas-sensitive material is a Pt-NiO-RGO ternary composite material or Pt-Ni (OH)2The RGO ternary composite material has the advantages of unexpected technical effect, capability of detecting ppb-level formaldehyde gas under the condition of room temperature and very high sensitivity. The method completely breaks through the high-temperature working environment when the conventional metal oxide is used as a gas-sensitive material, and realizes the purpose of detecting the formaldehyde gas at room temperature. In addition, the noble metal can be a noble metal nano material such as nano particles or nano wires, the existing nano material as the gas sensitive material only stays in the experimental stage and can not detect the low-concentration formaldehyde gas at room temperature, and the gas sensitive material can be really applied to life practice to detect the low-concentration formaldehyde gas at room temperature.
Through a large number of experiments, when the noble metal is Pt, Au or Pd metal, and the metal oxide is nickel oxide, iron oxide, cobalt oxide, manganese oxide or tin oxide, the gas-sensitive material obtains an unexpected technical effect that low-concentration formaldehyde can be detected very sensitively at room temperature, and the stability is very good. Particularly, the gas sensitive material is a Pt-NiO-RGO ternary composite material, the molar ratio of NiO to Pt is 0.6-0.8, and the mass of RGO is the mass of NiO and PtWhen the sum of the two components is 20-30%, the gas-sensitive material can obtain unexpected technical effects, has very high sensitivity for detecting low-concentration formaldehyde, and can completely replace the gas-sensitive material which needs high-temperature operation in the prior art. In addition, the gas-sensitive material is Pt-Ni (OH)2-RGO ternary composite material and Ni (OH)2And Pt in a molar ratio of 0.5 to 1, the mass of RGO being Ni (OH)2And 25-28% of the sum of the mass of Pt, the gas-sensitive material also obtains unexpected technical effect, and has very high sensitivity for detecting low-concentration formaldehyde. When the gas-sensitive material is applied to the gas-sensitive sensor, the gas-sensitive material is made into nano ink which is dripped on an electrode, so that the using amount of the gas-sensitive material used by each sensor is very small, and the cost is low.
In addition, the operating temperature of the formaldehyde gas sensor in the prior art metal oxide sensor technology is high, and therefore, the substrate material of the formaldehyde gas sensor in the prior art cannot be selected from a PCB board, but only a high temperature resistant substrate, such as a silicon substrate or a ceramic substrate, can be selected. Because the working temperature of the formaldehyde gas sensor in the invention can be normal temperature, the substrate material of the sensor can be selected to be a PCB (printed Circuit Board), and the cost of the PCB is obviously lower than that of a silicon substrate or a ceramic substrate.
Therefore, compared with the traditional metal oxide gas-sensitive material, the gas-sensitive material and the formaldehyde gas-sensitive sensor containing the gas-sensitive material do not need a high-temperature working environment, greatly reduce the power consumption, save the resources and enable the application field of the formaldehyde gas sensor to be wider. In addition, each sensor substrate needs less materials, so the cost of the materials is relatively low, and the industrial implementation of the formaldehyde gas sensor can be facilitated.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic structural diagram of a gas sensor for detecting low-concentration formaldehyde at room temperature according to an embodiment of the present invention;
FIG. 2 is a test chart of a gas sensor for detecting formaldehyde gas at room temperature in a low concentration according to an embodiment of the present invention;
FIG. 3 is a test chart of a gas sensor for detecting formaldehyde gas at room temperature in a low concentration according to another embodiment of the present invention;
fig. 4 is a test chart for detecting formaldehyde gas at room temperature when the gas sensitive material in the prior art of metal oxide gas sensor is applied to the gas sensitive sensor.
Detailed Description
One embodiment of the present invention provides a gas sensitive material 130 for detecting low-concentration formaldehyde at room temperature, where the gas sensitive material 130 is: the ternary composite material comprises a noble metal, a metal oxide and functionalized graphene, wherein the molar ratio of the metal oxide to the noble metal is 0.2-5, and the mass of the functionalized graphene is 15-50% of the sum of the mass of the metal oxide and the mass of the noble metal. The noble metal is Pt, Au or Pd metal, and the metal oxide is nickel oxide, iron oxide, cobalt oxide, manganese oxide or tin oxide.
In a preferred embodiment, the gas sensing material 130 is a Pt-NiO-RGO ternary composite material, wherein the molar ratio of NiO to Pt is 0.6-0.8, and the mass of RGO is 20-30% of the sum of the masses of NiO and Pt. In a further preferred embodiment, the molar ratio of NiO to Pt is 0.7 and the mass of RGO is 26% of the sum of the masses of NiO and Pt. In other embodiments, the molar ratio of NiO to Pt may also be, for example, 0.6, 0.65, 0.75, or 0.8, and the mass of RGO may also be 20%, 23%, 25%, 28%, or 30% of the sum of the mass of NiO and Pt. Wherein RGO is english abbreviation of reduced graphene oxide. Wherein, the Pt metal can be Pt nano particles and can also be Pt nano wires.
According to the scheme, the inventor finds that unexpected technical effects are obtained when the ternary composite material of the noble metal, the metal oxide and the functionalized graphene is used as the formaldehyde gas-sensitive material 130, particularly when the gas-sensitive material 130 is a Pt-NiO-RGO ternary composite material, ppb-level formaldehyde gas can be detected at room temperature, and the sensitivity is very high. The high-temperature working environment of the conventional metal oxide as the gas sensitive material 130 is completely broken through, and the formaldehyde gas is detected at room temperature.
Accordingly, an embodiment of the present invention further provides a method for preparing the gas sensitive material 130 for detecting low-concentration formaldehyde at room temperature, which includes the following steps:
s100, providing graphene oxide powder;
s200, dispersing the graphene powder in an organic solvent, and adding a metal salt solution and hydroxide ion type alkali to react to obtain a metal hydroxide and graphene oxide composite material;
s300, dispersing the metal hydroxide and graphene oxide composite material in an organic solvent, and adding a noble metal precursor solution and a reducing agent to react to obtain a ternary composite material of noble metal, metal hydroxide and functionalized graphene; and
s400, annealing the ternary composite material of the noble metal, the metal hydroxide and the functionalized graphene to obtain the ternary composite material of the noble metal, the metal oxide and the functionalized graphene.
In step S100, Graphene Oxide (GO) powder may be purchased or prepared by a known method such as staudenmai, Hummer, Brodie, or the like.
In a preferred embodiment, the step S200 includes the following steps:
s210, dispersing the graphene powder in an N, N-Dimethylformamide (DMF) organic solvent;
s220, adding a certain amount of nickel acetate and ammonia water;
s230, oil bath at 85 DEG CAnd stirred for 15h to obtain Ni (OH)2-RGO material.
The step S300 includes the following steps:
s310, mixing Ni (OH)2-RGO material dispersed in DMF organic solvent;
s320, adding a certain amount of chloroplatinic acid and a reducing agent;
s330, microwave reaction is carried out for 90S, wherein the power of the microwave is 600W.
In other embodiments, the oil bath temperature in step S230 may be 30 °, 50 °, 70 °, 90 °, or 120 °, and the stirring time may be 2h, 5h, 13h, 16h, or 18 h.
The microwave in the step S330 is reacted for 30S, 60S, 100S, 140S or 180S, and the power of the microwave is 450W, 500W, 700W or 900W.
One embodiment of the invention provides a gas sensor for detecting low-concentration formaldehyde at room temperature, which comprises the Pt-NiO-RGO ternary composite material. The gas sensor also includes a substrate 110 and at least two electrodes 120. The at least two electrodes 120 are formed at the surface of the substrate 110. The gas sensitive material 130 is applied to the surface of the substrate 110 and at least partially covers the at least two electrodes 120, such that the at least two electrodes 120 are conductive. In one embodiment, the gas sensor can include two electrodes 120. The two electrodes 120 are electrically connected to each other through the gas sensing material 130. The electrode 120 is made of a metal or alloy thin film. Wherein, the metal can be Pt, Au, Ag, Cu, Al, Ni or W, and the alloy film can be Ni/Cr, Mo/Mn, Cu/Zn, Ag/Pd, Pt/Au or Fe/Co. In one embodiment, the gas sensitive material 130 is made into a nano-ink and dropped on the substrate 110 to prepare a gas sensor.
FIG. 2 shows a test chart of a Pt-NiO-RGO ternary composite material applied to a gas sensor for detecting formaldehyde gas at room temperature. As shown in FIG. 2, the Pt-NiO-RGO ternary composite material can detect 0.2ppm of formaldehyde gas at room temperature, thereby illustrating that the material can detect ppb level of formaldehyde gas at room temperature. The sensitivity was 1.9% at 0.2ppm as calculated from the sensitivity formula. Therefore, the material has higher sensitivity for detecting formaldehyde at room temperature.
Another embodiment of the present invention provides a gas sensitive material 130 for detecting low-concentration formaldehyde at room temperature, where the gas sensitive material 130 is: the ternary composite material comprises a noble metal, a metal hydroxide and functionalized graphene, wherein the molar ratio of the metal hydroxide to the noble metal is 0.2-5, and the mass of the functionalized graphene is 15-50% of the sum of the mass of the metal hydroxide and the mass of the noble metal. The noble metal is Pt, Au or Pd metal, and the metal hydroxide is nickel hydroxide, iron hydroxide, cobalt hydroxide, manganese hydroxide or tin hydroxide.
In a preferred embodiment, the gas sensitive material 130 is Pt-Ni (OH)2-RGO ternary composite wherein Ni (OH)2And Pt in a molar ratio of 0.5 to 1, the mass of RGO being Ni (OH)2And 25-28% of the sum of the mass of Pt. In a further preferred embodiment, Ni (OH)2And Pt in a molar ratio of 0.6, the mass of RGO being Ni (OH)2And 27% of the sum of the masses of Pt. In other embodiments, Ni (OH)2The molar ratio of Pt to Pt may be, for example, 0.5, 0.65, 0.75 or 0.8, and the mass of RGO may be Ni (OH)2And 25%, 26% or 28% of the sum of the mass of Pt.
Accordingly, an embodiment of the present invention further provides a method for preparing the gas sensitive material 130 for detecting low-concentration formaldehyde at room temperature, which includes the following steps:
s100', providing graphene oxide powder;
s200', dispersing the graphene powder in an organic solvent, and adding a metal salt solution and hydroxide ion type alkali to react to obtain a metal hydroxide and graphene oxide composite material;
s300', dispersing the metal hydroxide and graphene oxide composite material in an organic solvent, and adding a noble metal precursor solution and a reducing agent to react to obtain the ternary composite material of noble metal, metal hydroxide and functionalized graphene.
In the step S100', the graphene oxide powder may be purchased or prepared by a known method such as staudenmai, Hummer, Brodie, or the like.
In a preferred embodiment, the step S200' includes the following steps:
s210', dispersing the graphene powder in a DMF organic solvent;
s220', adding a certain amount of nickel acetate and ammonia water;
s230', oil bath at 85 ℃ and stirring for 15h to obtain Ni (OH)2-RGO material.
The step S300 includes the following steps:
s310', mixing Ni (OH)2-RGO material dispersed in DMF organic solvent;
s320', adding a certain amount of chloroplatinic acid and a reducing agent;
s330', and carrying out microwave reaction for 90S, wherein the power of the microwave is 600W.
In other embodiments, the oil bath temperature in step S230' may be 30 °, 50 °, 70 °, 90 °, or 120 °, and the stirring time may be 2h, 5h, 13h, 16h, or 18 h.
The microwave in the step S330' reacts for 30S, 60S, 100S, 140S or 180S, and the power of the microwave is 450W, 500W, 700W or 900W.
Another embodiment of the invention provides a gas sensor for detecting low-concentration formaldehyde at room temperature, which comprises the Pt-Ni (OH)2-RGO ternary composites. The gas sensor also includes a substrate 110 and at least two electrodes 120. The at least two electrodes 120 are formed at the surface of the substrate 110. The gas sensitive material 130 is applied to the surface of the substrate 110 and at least partially covers the at least two electrodes 120, such that the at least two electrodes 120 are conductive. In one embodiment, the gas sensor can include two electrodes 120. The two electrodes 120 are electrically connected to each other through the gas sensing material 130. The electrode 120 is made of a metal or alloy thin film. Wherein, the metal can be Pt, Au, Ag, Cu, Al, Ni or W, and the alloy film can be Ni/Cr, Mo/Mn, Cu/Zn, Ag/Pd, Pt/Au or Fe/Co.
FIG. 3 shows a reaction of Pt-Ni (OH)2Application of RGO ternary composite material in gas sensor for detecting formaldehyde gas at room temperatureAnd (6) testing the graph. As shown in FIG. 3, Pt-Ni (OH)2The RGO ternary composite material can detect 0.5ppm of formaldehyde gas at room temperature, thereby indicating that the material can detect ppb level of formaldehyde gas at room temperature. The sensitivity was 0.1% at 0.5ppm as calculated from the sensitivity formula. Therefore, the material has higher sensitivity for detecting formaldehyde at room temperature. However, compared to the application of Pt-NiO-RGO ternary composite material in gas sensors, Pt-Ni (OH)2The sensitivity of RGO is slightly worse. The reason is that the resistance of the material before annealing is about several K, and Ni (OH) after annealing2The material is changed into NiO material, the resistance is increased, and the lower limit and the sensitivity of formaldehyde test are both increased.
For comparison, the invention makes a comparison experiment, and the gas sensitive material selects Pd-SnO which is commonly used in the prior art and has higher sensitivity2The material is used for detecting formaldehyde gas with different concentrations at room temperature. Fig. 4 shows a test chart of detecting formaldehyde gas at room temperature when the gas sensitive material in the prior art is applied to a gas sensor, wherein a test diagram of responses of formaldehyde gas with different concentrations is shown. As shown in FIG. 4, the prior art gas sensor has no response when the concentration of formaldehyde gas is 0.8ppm-3ppm, and the baseline of the material is always reduced during detection, so that the resistance is very unstable. From this, it is known that the gas sensor in the related art cannot detect a low concentration of formaldehyde gas at normal temperature.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (11)
1. A gas-sensitive material for detecting low-concentration formaldehyde at room temperature,
the gas sensitive material is a ternary composite material of precious metal, metal oxide and functionalized graphene, wherein the ternary composite material consists of Pt-NiO-RGO, the molar ratio of NiO to Pt is 0.6-0.8, and the mass of RGO is 20-30% of the sum of the mass of NiO and Pt;
wherein the gas-sensitive material can detect the formaldehyde gas with the concentration of ppb level at room temperature.
2. A gas-sensitive material for detecting low-concentration formaldehyde at room temperature,
the gas-sensitive material is prepared from Pt-Ni (OH)2-ternary composite of noble metal, metal oxide and functionalized graphene, of RGO, wherein ni (oh)2And Pt in a molar ratio of 0.5 to 1, the mass of RGO being Ni (OH)2And 25-28% of the sum of the mass of Pt;
wherein the gas-sensitive material can detect the formaldehyde gas with the concentration of ppb level at room temperature.
3. A method for preparing the gas-sensitive material of claim 2 for detecting low-concentration formaldehyde at room temperature, comprising the steps of:
providing graphene oxide powder;
dispersing the graphene powder in an organic solvent, and adding a metal salt solution and hydroxide ion type alkali to react to obtain a metal hydroxide and graphene oxide composite material;
and dispersing the metal hydroxide and graphene oxide composite material in an organic solvent, and adding a noble metal precursor solution and a reducing agent to react to obtain the ternary composite material of noble metal, metal hydroxide and functionalized graphene.
4. The preparation method according to claim 3, wherein the reaction conditions of the metal hydroxide and graphene oxide composite material are as follows: heating to 30-120 deg.C in oil bath, and stirring for 2-18 h.
5. The preparation method of claim 4, wherein the reaction conditions of the ternary composite material of the noble metal, the metal hydroxide and the functionalized graphene are as follows: carrying out reaction in microwave, wherein the power of the microwave is 450-900W, and the reaction time is 30-180 s.
6. A method for preparing the gas-sensitive material of claim 1 for detecting low-concentration formaldehyde at room temperature, comprising the steps of:
providing graphene oxide powder;
dispersing the graphene powder in an organic solvent, and adding a metal salt solution and hydroxide ion type alkali to react to obtain a metal hydroxide and graphene oxide composite material;
dispersing the metal hydroxide and graphene oxide composite material in an organic solvent, and adding a noble metal precursor solution and a reducing agent to react to obtain a noble metal, metal hydroxide and functionalized graphene ternary composite material;
and annealing the ternary composite material of the noble metal, the metal hydroxide and the functionalized graphene to obtain the ternary composite material of the noble metal, the metal oxide and the functionalized graphene.
7. The preparation method according to claim 6, wherein the reaction conditions of the metal hydroxide and graphene oxide composite material are as follows: heating to 30-120 deg.C in oil bath, and stirring for 2-18 h.
8. The preparation method of claim 7, wherein the reaction conditions of the ternary composite material of the noble metal, the metal hydroxide and the functionalized graphene are as follows: carrying out reaction in microwave, wherein the power of the microwave is 450-900W, and the reaction time is 30-180 s.
9. A gas sensor for detecting low-concentration formaldehyde at room temperature, comprising:
a substrate;
at least two electrodes formed at a surface of the substrate; and
the gas-sensitive material of claim 1 or 2, which is applied to the surface of the substrate and at least partially covers the at least two electrodes, so that the at least two electrodes are conductive;
wherein the gas sensor can detect the formaldehyde gas with the concentration of ppb level at room temperature.
10. The gas sensor of claim 9, wherein the substrate is selected from one of a PCB board, a silicon substrate, and a ceramic substrate.
11. The gas sensor of claim 10, wherein the electrodes are made of a metal or alloy thin film;
wherein the metal is selected from one of Pt, Au, Ag, Cu, Al, Ni and W, and the alloy thin film is selected from one of Ni/Cr, Mo/Mn, Cu/Zn, Ag/Pd, Pt/Au and Fe/Co.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710439435.XA CN107290389B (en) | 2017-06-12 | 2017-06-12 | Gas-sensitive material for detecting low-concentration formaldehyde at room temperature, preparation method thereof and gas-sensitive sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710439435.XA CN107290389B (en) | 2017-06-12 | 2017-06-12 | Gas-sensitive material for detecting low-concentration formaldehyde at room temperature, preparation method thereof and gas-sensitive sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107290389A CN107290389A (en) | 2017-10-24 |
| CN107290389B true CN107290389B (en) | 2020-02-07 |
Family
ID=60096509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710439435.XA Active CN107290389B (en) | 2017-06-12 | 2017-06-12 | Gas-sensitive material for detecting low-concentration formaldehyde at room temperature, preparation method thereof and gas-sensitive sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107290389B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860794A (en) * | 2017-11-06 | 2018-03-30 | 余帝乾 | A kind of gas sensor encapsulating structure |
| CN107884443A (en) * | 2017-11-06 | 2018-04-06 | 余帝乾 | A kind of gas sensor |
| CN107879381B (en) * | 2017-11-07 | 2019-08-23 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of the monatomic modification NiO nano material of Sn for formaldehyde sensor and products thereof and application |
| CN108318510B (en) * | 2018-01-09 | 2019-11-26 | 山东大学 | The Pt/SnO2 nano particle cluster gas sensor and preparation method thereof of RGO package |
| CN108732207B (en) * | 2018-04-17 | 2020-03-20 | 上海理工大学 | Sensitive material for formaldehyde detection and preparation method and application thereof |
| CN110412085A (en) * | 2019-07-17 | 2019-11-05 | 济南大学 | A kind of formaldehyde sensor gas sensitive and its sensor and preparation method, application |
| CN111781152B (en) * | 2020-07-10 | 2021-05-11 | 德州学院 | Graphene-sensitized optical fiber lactic acid sensor and preparation method thereof |
| CN115057437B (en) * | 2022-05-30 | 2023-11-24 | 苏州大学 | SnO (tin oxide) 2 NiO/graphene ternary composite material and preparation method and application thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8344358B2 (en) * | 2010-09-07 | 2013-01-01 | International Business Machines Corporation | Graphene transistor with a self-aligned gate |
| CN102866178A (en) * | 2012-09-07 | 2013-01-09 | 清华大学 | Gas sensor and forming method thereof |
| CN104034758A (en) * | 2014-05-28 | 2014-09-10 | 南京益得冠电子科技有限公司 | Integrated hydrogen sensor made from mixed graphene film, noble metal particles and metallic oxide materials and preparation method thereof |
| CN104849263B (en) * | 2015-04-20 | 2017-08-15 | 北京联合大学 | The catalytic luminescence sensitive material of fast measuring formaldehyde and carbon monoxide |
| CN105158303B (en) * | 2015-09-09 | 2018-08-17 | 安徽工程大学 | Noble metal/base metal oxide/graphene tri compound gas sensitive and preparation |
-
2017
- 2017-06-12 CN CN201710439435.XA patent/CN107290389B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107290389A (en) | 2017-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107290389B (en) | Gas-sensitive material for detecting low-concentration formaldehyde at room temperature, preparation method thereof and gas-sensitive sensor | |
| CN107132258B (en) | gas-sensitive material for detecting low-concentration formaldehyde at room temperature, preparation method thereof and formaldehyde gas sensor | |
| Wan et al. | Screen-printed gold electrode with gold nanoparticles modification for simultaneous electrochemical determination of lead and copper | |
| Yang et al. | Enhanced anti-interference on electrochemical detection of arsenite with nanoporous gold in mild condition | |
| Liao et al. | Wireless water quality monitoring and spatial mapping with disposable whole-copper electrochemical sensors and a smartphone | |
| Promsuwan et al. | Nitrite amperometric sensor for gunshot residue screening | |
| Stanković et al. | Determination of nitrite in tap water: A comparative study between cerium, titanium and selenium dioxide doped reduced graphene oxide modified glassy carbon electrodes | |
| Sarkar et al. | Electrochemical sensing systems for arsenate estimation by oxidation of L-cysteine | |
| CN102692437A (en) | Gas sensitive material, carbon monoxide gas sensitive element adopting gas sensitive material and preparation method of carbon monoxide gas sensitive element | |
| AU2015268607B2 (en) | Gas sensor, measuring element for a gas sensor and method for preparing a measuring element | |
| CN105572170B (en) | SnO with environment epidemic disaster self compensation ability2Base hot wire type semiconductor gas sensor | |
| Velmurugan et al. | Development of electrochemical sensor for the determination of palladium ions (Pd2+) using flexible screen printed un-modified carbon electrode | |
| Penagos‐Llanos et al. | Carbon paste composite with Co3O4 as a new electrochemical sensor for the detection of Allura Red by reduction | |
| Cheng et al. | Enhanced non-enzyme nitrite electrochemical sensing property based on stir bar-shaped ZnO nanorods decorated with nitrogen-doped reduced graphene oxide | |
| Wang et al. | A highly sensitive sensor for the detection of nitrite based on a nanoporous Fe 2 O 3–CoO composite | |
| Wang et al. | Preparation and CO gas-sensing behavior of Au-doped SnO2 sensors | |
| Yıldız et al. | Highly sensitive direct simultaneous determination of zinc (II), cadmium (II), lead (II), and copper (II) based on in-situ-bismuth and mercury thin-film plated screen-printed carbon electrode | |
| Ali et al. | Construction and performance characteristics of modified screen printed and modified carbon paste sensors for selective determination of cu (ii) ion in different polluted water samples | |
| Batista et al. | Metal organic framework‐235 (MOF‐235) modified carbon paste electrode for catechol determination in water | |
| Khan | Detecting inorganic arsenic below WHO threshold limit; A comparative study of various sensors | |
| Pungjunun et al. | Smartphone-based electrochemical analysis integrated with NFC system for the voltammetric detection of heavy metals using a screen-printed graphene electrode | |
| Shamsipur et al. | Electrocatalytic Determination of Traces of Hydrazine by a Glassy Carbon Electrode Modified with Palladium‐Gold Nanoparticles | |
| Lin et al. | Copper tape to improve analytical performance of disposable carbon electrodes in stripping analysis | |
| Gui et al. | Detection and discrimination of low concentration explosives using MOS nanoparticle sensors | |
| Wang et al. | Potentiometric microsensor based on ion-imprinted polymer for the trace determination of cesium (I) ions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |