CN114408962A - Preparation method and application of rGO modified zinc oxide-based sensing material - Google Patents
Preparation method and application of rGO modified zinc oxide-based sensing material Download PDFInfo
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- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical class [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000011540 sensing material Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000011787 zinc oxide Substances 0.000 claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 33
- 239000002244 precipitate Substances 0.000 claims abstract description 31
- 238000005406 washing Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 19
- 239000006185 dispersion Substances 0.000 claims abstract description 18
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000011259 mixed solution Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 47
- 239000007789 gas Substances 0.000 claims description 39
- 239000000243 solution Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims description 5
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 5
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 19
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- 235000019441 ethanol Nutrition 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000005119 centrifugation Methods 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000005485 electric heating Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- -1 formaldehyde, nitrogen oxides Chemical class 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004246 zinc acetate Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
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- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
-
- 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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
Abstract
The application belongs to the technical field of sensing detection material application, and provides a preparation method and application of a rGO modified zinc oxide-based sensing material, wherein the preparation method comprises the following steps: s1, mixing the graphene oxide dispersion liquid with zinc oxide to obtain a mixed solution; the mass percentage of the graphene oxide and the zinc oxide in the graphene oxide dispersion liquid is more than 5%; s2, carrying out hydrothermal reaction on the mixed solution to obtain a precipitate; s3, centrifuging, washing and drying the precipitate to obtain the rGO modified zinc oxide based sensing material. Through sample measurement, compared with the traditional ZnO, the response of the rGO modified ZnO material disclosed by the invention to gas is improved by more than 4 times, and the gas sensitivity is better.
Description
Technical Field
The application belongs to the technical field of application of sensing detection materials, and particularly relates to a preparation method and application of a rGO modified zinc oxide-based sensing material.
Background
Today, the popularity of the internet is increasing day by day, convenient and fast scientific and technological products make great contribution to the development of human society, and information technology becomes an essential part in life and production of people. However, as science and technology are gradually developed, the discharge amount of fossil energy is increased, and various environmental pollution problems are caused by accumulated discharge pollution, so that adverse consequences are caused. Among the pollution problems caused by these chemical emissions, air pollution is a relatively serious one. The probability that people contact harmful gases such as carbon monoxide, formaldehyde, nitrogen oxides, acetone and the like in daily life and production is increased, and the problems of serious casualties and economic losses caused by leakage and explosion of flammable and explosive gases are also attracted by wide social attention. In order to solve these problems, people need effective technical means to detect the types, concentrations and corresponding changes of harmful gases in the air so as to respond timely.
The demand of sensor technology determines the scientific research direction aiming at the detection problem of the external environment condition. Among semiconductor materials, zinc oxide materials themselves have good gas sensing properties, so zinc oxide is commonly used in the preparation of various gas sensors. The zinc oxide-based gas sensor has the advantages of multiple detection gas types, simple preparation process, stable property and the like, but has slow response speed and poor gas selectivity, and influences the application range of the zinc oxide-based gas sensor in practice.
Disclosure of Invention
In view of this, the application provides a preparation method and application of a rGO modified zinc oxide-based sensing material.
The invention provides a preparation method of a rGO modified zinc oxide based sensing material, which comprises the following steps:
s1, mixing the graphene oxide dispersion liquid with zinc oxide to obtain a mixed solution; the mass percentage of the graphene oxide and the zinc oxide in the graphene oxide dispersion liquid is more than 5%;
s2, carrying out hydrothermal reaction on the mixed solution to obtain a precipitate;
s3, centrifuging, washing and drying the precipitate to obtain the rGO modified zinc oxide based sensing material.
Preferably, in step S1, the mass percentage of the graphene oxide and the zinc oxide in the graphene oxide dispersion liquid is 6-11%.
Preferably, in step S1, the graphene oxide dispersion liquid is prepared by dissolving graphene oxide in an alcohol-water solvent and then performing ultrasonic processing; the zinc oxide is micro-nano zinc oxide obtained by a precipitation method or a hydrothermal method.
Preferably, in step S2, the temperature of the hydrothermal reaction is 150-165 ℃, and the holding time is more than 8 h.
Preferably, in step S3, the centrifugal washing is performed by three ethanol washes, four water washes and one ethanol wash.
Preferably, in step S3, the drying temperature is 50-70 ℃ and the drying time is 10-12 h.
The invention provides application of the rGO modified zinc oxide based sensing material obtained by the preparation method in gas detection.
Preferably, the gas comprises one or more of nitrogen dioxide, carbon dioxide, methanol, ethanol and dimethyl ether.
Compared with the prior art, the rGO-modified ZnO-based sensing material is prepared by mainly adopting the graphene oxide dispersion liquid and zinc oxide through a hydrothermal method, wherein the mass percentage of the graphene oxide and the zinc oxide in the graphene oxide dispersion liquid is controlled to be more than 5%, and the target sample material is obtained through centrifugal washing and drying after hydrothermal reaction. Through sample measurement, compared with the traditional ZnO, the response of the rGO modified ZnO material disclosed by the invention to gas is improved by more than 4 times, and the gas sensitivity is better.
Drawings
FIG. 1 is an SEM image of a rGO modified ZnO material prepared in example 3 of the present invention;
FIG. 2 is a graph showing the response of carbon dioxide detection in example 4 of the present invention;
fig. 3 is the gas selectivity results for rGO modified ZnO material described in example 5 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a preparation method of a rGO modified zinc oxide based sensing material, which comprises the following steps:
s1, mixing the graphene oxide dispersion liquid with zinc oxide to obtain a mixed solution; the mass percentage of the graphene oxide and the zinc oxide in the graphene oxide dispersion liquid is more than 5%;
s2, carrying out hydrothermal reaction on the mixed solution to obtain a precipitate;
s3, centrifuging, washing and drying the precipitate to obtain the rGO modified zinc oxide based sensing material.
The method can prepare the zinc oxide-based sensing material with better gas sensitivity, and is beneficial to application in gas sensors.
In the embodiment of the invention, Graphene Oxide (GO) is firstly dispersed, specifically, GO with a certain mass can be dissolved in an alcohol-water solvent, and graphene oxide dispersion liquid is obtained through ultrasound. Wherein the graphene oxide is commercially available. The alcohol-water solvent is mainly a mixed solvent of water and absolute ethyl alcohol, and the volume ratio of the alcohol-water solvent to the absolute ethyl alcohol is preferably 2: 1.
in the embodiment of the present invention, zinc oxide (ZnO) solid is added to the solution after the ultrasonic treatment, and the mixed solution is preferably stirred uniformly. The zinc oxide can be micro-nano zinc oxide obtained by a precipitation method or a hydrothermal method, and can be commercially available or self-made. The mass percentage of the graphene oxide to the zinc oxide in the graphene oxide dispersion liquid is more than 5%, preferably 6-11%, and more preferably 8-10%.
In the preferred embodiment of the invention, 0.012g of graphene oxide is weighed and dissolved in a beaker filled with 20ml of water and 10ml of absolute ethyl alcohol, and the graphene oxide is fully mixed with 0.12g of zinc oxide after ultrasonic treatment.
In the embodiment of the invention, the obtained mixed solution is transferred into a reaction kettle with a polytetrafluoroethylene lining and heated for reaction. The zinc oxide-based sensing material is prepared through hydrothermal reaction, wherein the reaction temperature is preferably 150-165 ℃, and more preferably 160 ℃; the holding time may be 8 hours or more, preferably 9 to 11 hours, more preferably 10 hours.
After the reaction is finished, the embodiment of the invention is naturally cooled to room temperature, and the reaction kettle is opened to carry out solid-liquid separation on the solution with the precipitate in the lining, so as to obtain the precipitate.
In some preferred embodiments of the present invention, the precipitate obtained by centrifugation is subjected to centrifugal washing, preferably using three ethanol washes, four water washes and one ethanol wash.
According to the embodiment of the invention, the sediment after centrifugal washing and a centrifugal tube are placed in a 50-70 ℃ electrothermal blowing drying oven together, dried for 10-12h, taken out and ground in a mortar, and the obtained rGO modified zinc oxide based powder material is bottled and stored.
The invention provides application of the rGO modified zinc oxide-based sensing material obtained by the preparation method in gas detection, namely, the modified ZnO-based gas sensor is constructed or prepared for gas detection in the embodiment of the invention.
Preferably, the gas comprises nitrogen dioxide (NO)2) Carbon dioxide (CO)2) Methanol (CH)3OH), ethanol (C)2H5OH) and methyl ether (C)2H6O), and more preferably nitrogen dioxide, and has good detection sensitivity. The invention can detect more kinds of gases; the gas sensor constructed by the embodiment of the invention has good selectivity, sensitivity, convenience and the like, and is beneficial to practical application.
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the invention. Commercially available raw materials were used in the examples of the present invention.
Example 1 process for the preparation of particulate zinc oxide:
(1) preparing a solution. 0.50g of zinc acetate and 0.50g of citric acid were weighed, and the weighed medicine was added to 100ml of deionized water. To prepare a solution.
(2) And (c) preparing a solution b. 0.56g of polyvinylpyrrolidone (pvp) is weighed and dissolved in 40ml of deionized water, the solution is added dropwise to the solution a and mixed to obtain a solution b, the solution is placed in a magnetic stirrer and is stirred continuously for 5min at the rotating speed of 400r/min, and the subsequent treatment is waited.
(3) And (c) preparing a solution. Solution c was prepared by weighing 1.60g of sodium hydroxide and dissolving in 20ml of deionized water.
(4) A precipitate formed. And (c) dropwise adding the solution c into the solution b, continuously stirring for more than 30min at the speed of 400r/min, changing the solution into emulsion from the precipitate generated by clear liquid in the stirring process, gradually disappearing the precipitate, changing the emulsion into light yellow, continuously darkening the light yellow into brown, finally obtaining dark pink solution, standing the solution for 10min, and pouring out part of the supernatant to obtain zinc oxide precipitate.
(5) And (5) carrying out precipitation treatment. And (3) performing three-time ethanol washing, four-time water washing and one-time ethanol washing on the precipitate after centrifugation, placing the precipitate in a high-speed centrifuge, centrifuging for 5min at the rotating speed of 8000r/min, and repeatedly washing for eight times.
(6) And (5) drying the precipitate. And after centrifugation, placing the precipitate and a centrifuge tube in an electrothermal blowing drying oven at 60 ℃, drying for 12h, taking out the precipitate, grinding in a mortar, and bottling for storage.
The above examples produced zinc oxide in particulate form, on the micron scale, by precipitation. The sensor is constructed by taking the sensor as a substrate, but because the resistance value of the sensor is larger than the range of equipment, the related gas-sensitive performance test cannot be carried out.
Example 2:
(1) solution a was prepared. 0.878g of zinc acetate was weighed and dissolved in 60ml of deionized water to prepare a solution.
(2) Solution b was prepared. 2.40g of sodium hydroxide was weighed and dissolved in 20ml of deionized water to prepare a solution b.
(3) Prepared by a hydrothermal method. And slowly adding the solution b into the solution a, stirring at 400r/min for 5min, then moving into a 100ml polytetrafluoroethylene lining, reserving 1/3 safety space, and screwing the lining after being filled into a reaction kettle to ensure the experimental safety. The reaction conditions of the electric heating constant temperature incubator are 160 ℃, the heat preservation time is 10 hours, the electric heating constant temperature incubator is naturally cooled to the room temperature after the experiment is finished, the reaction kettle is opened to subpackage the solution in the lining together with the precipitate, and the solution is moved into four centrifugal tubes with the same specification.
(4) And (5) carrying out precipitation treatment. And (4) carrying out three-time ethanol washing, four-time water washing and one-time ethanol washing on the precipitate after centrifugation. The precipitate was placed in a high speed centrifuge and centrifuged at 8000r/min for 5min, and the washing was repeated eight times.
(5) And (5) drying the precipitate. And after centrifugal washing, placing the precipitate and a centrifuge tube in a 60 ℃ electric heating air blast drying oven, drying for 12h, taking out the precipitate, grinding in a mortar, and bottling for storage.
The zinc oxide prepared in this example has a conical cylinder shape and is white powder.
Example 3:
(1) dispersing GO. 0.012g of GO is dissolved in a beaker containing 20ml of water and 10ml of absolute ethyl alcohol, and is covered with a layer of preservative film and then is subjected to ultrasonic treatment for 1 hour at 60 kHz.
(2) And (4) fully mixing. 0.12g of the pyramidal ZnO prepared in example 2 was slowly added to the sonicated solution, and the mixed solution was stirred on a magnetic stirrer at 400r/min for 3 hours.
(3) Prepared by a hydrothermal method. The mixed solution is moved into a 50ml polytetrafluoroethylene lining, a 1/3 safety space is reserved, the lining is screwed after being filled into a reaction kettle, and the experimental safety is ensured. The reaction conditions of the electric heating constant temperature incubator are 160 ℃, the heat preservation time is 10 hours, the electric heating constant temperature incubator is naturally cooled to the room temperature after the experiment is finished, and the reaction kettle is opened to subpackage and move the solution in the lining and the sediment into four centrifugal tubes with the same specification.
(4) And (5) carrying out precipitation treatment. And (4) washing the precipitate after centrifugation with three times of ethanol and four times of water and one time of ethanol. The precipitate was placed in a high speed centrifuge and centrifuged at 8000r/min for 5min, and the washing was repeated eight times.
(5) And (5) drying the precipitate. And after centrifugation, placing the precipitate and a centrifuge tube in an electrothermal blowing drying oven at 60 ℃, drying for 12h, taking out the precipitate, grinding in a mortar, and bottling for storage.
The sample obtained in example 3 is characterized by (X-ray diffraction) XRD, Scanning Electron Microscope (SEM) and ultraviolet-visible spectrum, wherein the Scanning Electron Microscope (SEM) picture is shown in figure 1.
The result shows that the rGO modified zinc oxide-based powder material is prepared by a hydrothermal method, wherein the rGO accounts for 10%.
Comparative example 1
The modified zinc oxide-based powder material is obtained according to the method and the steps of the embodiment 3, and the difference is that the rGO accounts for 5 percent.
Example 4
Gas sensors were constructed from particulate ZnO (prepared in example 1), the rGO-modified zinc oxide-based powder material (10% rGO) prepared in example 3, and the modified zinc oxide-based powder material (5% rGO) prepared in comparative example 1, respectively, for CO2Response detection is performed. Wherein, the gas sensor is constructed by using water as a bonding agent, and the zinc oxide material is coated on a gas sensor substrate to be used as a gas sensitive material film of the gas sensor; the sensor was then placed in a different concentration of CO2The test was performed at room temperature in the sealed bottle of (1).
The result is shown in figure 2, and the sensing detection effect of the zinc oxide-based powder modified by 10% rGO is the best.
Example 5
Gas sensors were constructed from particulate ZnO (prepared in example 1), the rGO-modified zinc oxide-based powder material prepared in example 3 (10% rGO), and the modified zinc oxide-based powder material prepared in comparative example 1 (5% rGO) in the same manner as in example 4, and various gas responses were detected. Gas sensitivity test conditions: the gas with the concentration is introduced into a sealed space, and the impedance response of the gas is tested by a digital multimeter, so that the change of the sensitivity to the gas is reflected.
The results are shown in FIG. 3, which results in a 10% rGO modified zinc oxide basePowder to NO2The sensing detection effect of (2) is the best.
According to the embodiments, the rGO-modified ZnO-based sensing material is prepared by mainly adopting the graphene oxide dispersion liquid and zinc oxide through a hydrothermal method, wherein the mass percentage of the graphene oxide and the zinc oxide in the graphene oxide dispersion liquid is controlled to be more than 5%, and the target sample material is obtained through centrifugal washing and drying after hydrothermal reaction. Through sample measurement, the response of the rGO modified ZnO material to gas is improved by more than 4 times compared with the traditional ZnO material. The rGO modified ZnO-based sensing material prepared by the invention has better gas sensitivity and is beneficial to application in gas sensors.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A preparation method of an rGO modified zinc oxide based sensing material is characterized by comprising the following steps:
s1, mixing the graphene oxide dispersion liquid with zinc oxide to obtain a mixed solution; the mass percentage of the graphene oxide and the zinc oxide in the graphene oxide dispersion liquid is more than 5%;
s2, carrying out hydrothermal reaction on the mixed solution to obtain a precipitate;
s3, centrifuging, washing and drying the precipitate to obtain the rGO modified zinc oxide based sensing material.
2. The preparation method according to claim 1, wherein in step S1, the mass percentage of graphene oxide to zinc oxide in the graphene oxide dispersion liquid is 6 to 11%.
3. The preparation method according to claim 2, wherein in step S1, the graphene oxide dispersion liquid is prepared by dissolving graphene oxide in an alcohol-water solvent and then subjecting the solution to ultrasonic treatment; the zinc oxide is micro-nano zinc oxide obtained by a precipitation method or a hydrothermal method.
4. The method as claimed in any one of claims 1 to 3, wherein the hydrothermal reaction temperature in step S2 is 150-165 ℃, and the holding time is more than 8 h.
5. The method according to claim 4, wherein in step S3, the centrifugal washing is performed by three ethanol washes, four water washes, and one ethanol wash.
6. The method according to claim 5, wherein the drying is performed at 50-70 ℃ for 10-12h in step S3.
7. Use of a rGO-modified zinc oxide-based sensing material obtained by the preparation process according to any one of claims 1 to 6 for the detection of gases.
8. Use according to claim 7, wherein the gas comprises one or more of nitrogen dioxide, carbon dioxide, methanol, ethanol and dimethyl ether.
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