CN110044969B - Rod-shaped ZnO nano material loaded with Au nano particles, preparation method thereof and application thereof in acetone gas sensor - Google Patents
Rod-shaped ZnO nano material loaded with Au nano particles, preparation method thereof and application thereof in acetone gas sensor Download PDFInfo
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- CN110044969B CN110044969B CN201910206677.3A CN201910206677A CN110044969B CN 110044969 B CN110044969 B CN 110044969B CN 201910206677 A CN201910206677 A CN 201910206677A CN 110044969 B CN110044969 B CN 110044969B
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- 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
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- 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
- G01N27/127—Composition of the body, e.g. the composition of its sensitive layer comprising nanoparticles
Abstract
The invention provides a rod-shaped ZnO nano material loaded with Au nano particles, wherein crystals of the rod-shaped ZnO nano material are rod-shaped crystals, the average particle size of crystal particles is 50nm, and the Au nano particles are uniformly loaded on the surfaces of the ZnO nano particles. The rod-shaped ZnO nano material loaded with Au nano particles is used as a sensitive material, so that the high specific surface area of the rod-shaped ZnO nano material is applied, and the catalytic action of Au on the surface of ZnO and acetone gas can be effectively utilized to improve the gas-sensitive response; in addition, the acetone gas sensor is an improvement on the existing structure, and the rod-shaped ZnO nano material loaded with the Au nano particles is coated on the sensitive element, so that the acetone gas sensor has the characteristics of simple preparation method, low cost, excellent quick response recovery characteristic and large-scale production, and has good detection performance on acetone gas.
Description
Technical Field
The invention belongs to the technical field of gas sensors, and particularly relates to an acetone gas sensor taking a rod-shaped ZnO nano material modified by Au nano particles as a gas sensitive material and a preparation method thereof.
Background
In industrial production, acetone is mainly used as a solvent in industries such as leather making, explosives, rubber, spray paint, plastics, grease, fiber and the like, and can also be used as an important raw material component for synthesizing substances such as iodoform, acetic anhydride, ketene, polyisoprene rubber, chloroform, methyl methacrylate, epoxy resin and the like. However, acetone has a great harm to human health, and is mainly manifested as an anesthetic effect on the central nervous system during acute poisoning, and symptoms of nausea, fatigue, dizziness, headache and easy excitation. In severe cases, the patients may suffer from shortness of breath, vomiting, spasm, or even coma. The air can irritate eyes, nose and throat. The chronic effects of acetone include burning, vertigo, bronchitis, pharyngitis, easy excitement, asthenia, etc. due to long-term contact. Prolonged contact with the skin can lead to dermatitis. Acetone itself has the characteristics of being extremely flammable and explosive. Therefore, the development of a sensor for rapidly and intelligently detecting the acetone gas is urgent.
Among various gas sensors, the metal oxide semiconductor type gas sensor is one of the most widely used gas sensors at present because of its advantages of high sensitivity, good selectivity, fast response recovery, low cost, convenient carrying and the like. The metal oxide semiconductor gas sensor can directly adsorb gas to be detected by using a sensitive material, so that the characteristics of the material, such as electrical property and the like, are changed, and the concentration of the gas to be detected is detected by detecting the change of an output signal of a peripheral circuit to a sensitive element. The oxide semiconductor sensitive materials with different morphologies also have great influence on the gas-sensitive performance, so the gas-sensitive performance of the materials can be improved by synthesizing the sensitive materials with different morphologies. In addition, the catalytic material has a great influence on the gas-sensitive performance of the sensitive material.
Disclosure of Invention
In order to solve the technical problems, the invention provides a rod-shaped ZnO nano material loaded with Au (gold) nano particles.
The invention also aims to provide a preparation method of the rod-shaped ZnO nano material loaded with the Au nano particles.
The invention further aims to provide application of the rod-shaped ZnO nano material loaded with the Au nano particles in an acetone gas sensor.
The crystal of the rodlike ZnO nanomaterial loaded with Au nanoparticles is a rodlike crystal, the average particle size of the crystal particles is 50nm, and the Au nanoparticles are uniformly loaded on the surface of the ZnO nanoparticles.
The preparation method of the rod-shaped ZnO nano material loaded with the Au nano particles comprises the following steps:
step one, preparing rod-shaped ZnO
The rod-shaped ZnO can be prepared by a plurality of methods, such as a hydrothermal method, a thermal zinc powder evaporation method, a microwave heating method and the like, and the invention provides the following preparation method:
s11, adding 1-4 g of NaOH into 30-45 ml of water to completely dissolve the NaOH, and marking as solution A;
s12 mixing 0.5-1.0 g ZnSO 4 Dissolving the mixture in 10-15 ml of water to completely dissolve the mixture, and marking the solution as a solution B;
placing the S13A solution in a water bath at 55-70 ℃, dropwise adding the B solution into the A solution while stirring; then diluting the solution with 40-60 ml of water, and drying at 60-80 ℃ for 4-6 hours; and then centrifugally washing the mixed solution, drying the precipitate for 12-24 hours at the temperature of 60-80 ℃, taking out the precipitate and grinding the precipitate to obtain rod-shaped ZnO white powder.
Step two, preparation of rod-shaped ZnO nano material modified by Au nano particles
S21, adding 0.02-0.1 g of the rod-shaped ZnO powder prepared in the step one into 25-50 ml of water to completely dissolve the rod-shaped ZnO powder;
s22 HAuCl with the concentration of 45-60 mmol/L and the concentration of 0.04-0.08 ml 4 Adding the solution into the solution prepared in the S21, and uniformly mixing;
s23 mixing 1.0-3.0 ml of NH 3 ·H 2 Adding O into the mixed solution prepared by the S22, and reacting for 1.5-3 hours;
s24, collecting the reaction product prepared in S23, washing the reaction product with deionized water and anhydrous alcohol, drying the reaction product for 3-5 hours at 55-70 ℃, finally, annealing the obtained powder for 1-2 hours at 340-360 ℃ by using a muffle furnace, taking out the powder, and grinding the powder for 20-30 minutes to obtain the rod-shaped ZnO nano material modified by the Au nano particles.
Further, the solvent water used in the first step and the second step is deionized water or ultrapure water.
Further, in the step S13, the dropping speed of the solution B to the solution a is 1 drop/second, the dropping speed is controlled to completely react the zinc sulfate with the sodium hydroxide, and the target rod-like crystal ZnO can be prepared by controlling the reactant ratio, the reaction temperature and the drying parameters.
The rod-shaped ZnO nano material loaded with the Au nano particles is applied to an acetone gas sensor, and the rod-shaped ZnO nano material loaded with the Au nano particles is coated on a sensitive element of the sensor.
Furthermore, the thickness of a sensitive layer formed by the rod-shaped ZnO nano material loaded with the Au nano particles is 20-40 μm.
Furthermore, the acetone gas sensor comprises an explosion-proof cover, a sensitive element coated with rod-shaped ZnO nano material loaded with Au nano particles and a six-pin tube seat.
Further, the preparation method of the acetone gas sensor comprises the following steps:
(1) preparing a rod-shaped ZnO nano material loaded with Au nano particles into slurry, and uniformly coating the slurry on Al with an annular Au electrode 2 O 3 Forming a sensitive layer with the thickness of 20-40 mu m on the outer surface of the ceramic tube, wherein the sensitive layer completely covers the annular Au electrode;
(2) drying the element obtained in the step (1) at the temperature of 60-80 ℃ for 1-3 hours;
(3) then, passing the Ni-Cr alloy heating wire with the resistance value of 35-40 omega through Al 2 O 3 The ceramic tube is used as a heating wire to obtain a sensitive element;
(4) and welding the sensitive element on a six-pin tube seat and packaging.
Further, the preparation method of the slurry in the step (1) comprises the steps of putting the dried rod-shaped ZnO nano material loaded with the Au nano particles into a mortar, and grinding for 20-30 minutes; and then dripping water into the mortar and continuing to grind for 20-30 minutes to obtain viscous slurry.
Further, the mass ratio of the rod-like ZnO nanomaterial loaded with Au nanoparticles to water in the slurry preparation is 5: 1-3.
The invention has the advantages and beneficial effects that: the rod-shaped ZnO nano material loaded with the Au nano particles has high specific surface area, and meanwhile, the sensitivity of ZnO to acetone gas is improved by modifying Au, so that the rod-shaped ZnO nano material loaded with the Au nano particles is used as a sensitive material, the high specific surface area is applied, and the gas-sensitive response can be improved by effectively utilizing the catalytic action of Au on the surface of ZnO and the acetone gas; in addition, the acetone gas sensor is an improvement on the existing structure, and the rod-shaped ZnO nano material loaded with the Au nano particles is coated on the sensitive element, so that the acetone gas sensor has the characteristics of simple preparation method, low cost, excellent quick response recovery characteristic and large-scale production, and has good detection performance on acetone gas. Generally, the invention has simple process, small volume of the manufactured device and suitability for mass production, thereby having important application value.
Drawings
FIG. 1: the shapes of SEM (a) and TEM (b) of the rod-shaped ZnO nano material modified by the Au nano particles are shown in the specification;
FIG. 2: the device structure of the acetone sensor prepared by the invention is shown schematically;
FIG. 3: the XRD pattern of the rod-shaped ZnO nano material modified by the Au nano particles prepared by the invention;
FIG. 4 is a schematic view of: the sensitivity-concentration characteristic curve of the device of the acetone sensor is shown at the working temperature of 172 ℃;
FIG. 5 is a schematic view of: the acetone sensor has a response recovery curve of the device under the conditions that the working temperature is 172 ℃ and the concentration of acetone gas is 100 ppm;
FIG. 6: the acetone sensor has the selective characteristics of devices under the conditions that the working temperature is 172 ℃ and the concentration of acetone gas is 100 ppm.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Example 1
An isothermal acetone sensor is manufactured by taking a rod-shaped ZnO nano material modified by Au nano particles as a sensitive material, and as shown in figure 2, the sensor consists of an explosion-proof protective cover 1, a sensitive element 2 coated with the rod-shaped ZnO nano material loaded with the Au nano particles and a six-pin tube seat 3.
The specific manufacturing steps are as follows:
(1) adding 2g of NaOH into 37.5ml of deionized water, and stirring for 5 minutes by magnetic force to completely dissolve the NaOH, wherein the solution is marked as A solution;
(2) 0.7189g of ZnSO 4 ·7H 2 Dissolving O in 12.5ml of deionized water, and stirring for 5 minutes by magnetic force to completely dissolve the O, and marking as a solution B;
(3) slowly dropwise adding the solution B into the solution A in a water bath at 60 ℃, magnetically stirring until the dropwise adding is completed, diluting the solution with 50ml of deionized water, and transferring the solution into an oven to dry for 6 hours at 60 ℃; centrifuging the mixed solution by using deionized water for multiple times to wash, drying the precipitate for 24 hours at 60 ℃, taking out and grinding to obtain rod-shaped ZnO white powder;
(4) adding 0.05g of rod-shaped ZnO powder into 40ml of deionized water, and completely dissolving the rod-shaped ZnO powder under magnetic stirring;
(5) 0.05076ml of HAuCl was taken 4 Adding the solution (with the concentration of 50mmol/L) into the solution prepared in the step (4), and magnetically stirring at room temperature to completely dissolve the solution;
(6) 2.0ml of NH 3 ·H 2 Adding O into the solution prepared in the step (5), stirring for 2 hours, collecting a product through centrifugation, washing with deionized water and anhydrous alcohol for multiple times, drying in an oven at 60 ℃ for 4 hours, finally annealing the obtained powder at 350 ℃ for 1 hour by using a muffle furnace, taking out the powder, and grinding in a large mortar for 20-30 minutes to obtain the rod-shaped ZnO nano material modified by the Au nano particles;
(7) putting the dried powder of the rod-shaped ZnO nano material modified by the Au nano particles into a mortar, and grinding for 30 minutes; then, dropping deionized water (the mass ratio of the nano material to the water is 5:2) into the mortar, and continuously grinding for 30 minutes to obtain viscous slurry; uniformly coating the paste on Al with annular Au electrodes by using a brush 2 O 3 Forming a sensitive layer with the thickness of 30 microns on the outer surface of the ceramic tube, wherein the sensitive layer completely covers the annular Au electrode;
(8) coating Al of rod-shaped ZnO nano material modified by Au nano particles 2 O 3 Drying the ceramic tube at 70 ℃ for 1 hour; then, a Ni-Cr alloy heating wire with the resistance value of 38 omega is penetrated through Al 2 O 3 And finally welding the sensitive element on a six-pin tube seat and packaging to obtain the acetone gas sensor of the powder of the rod-shaped ZnO nano material modified by the Au nano particles.
Example 2
An isothermal acetone sensor is manufactured by taking a rod-shaped ZnO nano material modified by Au nano particles as a sensitive material, and as shown in figure 2, the sensor consists of an explosion-proof protective cover 1, a sensitive element 2 coated with the rod-shaped ZnO nano material loaded with the Au nano particles and a six-pin tube seat 3.
The specific manufacturing steps are as follows:
(1) adding 1.5g of NaOH into 33.0ml of deionized water, and stirring for 5 minutes by magnetic force to completely dissolve the NaOH, wherein the solution is marked as solution A;
(2) 0.5113g of ZnSO 4 ·7H 2 Dissolving O in 10.5ml of deionized water, and stirring by magnetic force for 5 minutes to completely dissolve the O, and marking as a solution B;
(3) slowly dropwise adding the solution B into the solution A in a water bath at 60 ℃, magnetically stirring until the dropwise adding is completed, then diluting the solution with 50ml of deionized water, and transferring the solution into an oven to dry for 4 hours at 80 ℃; washing the mixed solution for many times by using deionized water through centrifugation, drying the precipitate for 12 hours at the temperature of 80 ℃, taking out the precipitate and grinding the precipitate to obtain rod-shaped ZnO white powder;
(4) adding 0.02g of rod-shaped ZnO powder into 25ml of deionized water, and completely dissolving the rod-shaped ZnO powder under magnetic stirring;
(5) 0.06123ml of HAuCl was taken 4 Adding the solution (with the concentration of 45mmol/L) into the solution prepared in the step (4), and magnetically stirring at room temperature to completely dissolve the solution;
(6) 1.5ml of NH 3 ·H 2 Adding O into the solution prepared in the step (5), stirring for 2 hours, collecting a product through centrifugation, washing with deionized water and anhydrous alcohol for multiple times, drying in an oven at 60 ℃ for 4 hours, finally annealing the obtained powder at 350 ℃ for 1 hour by using a muffle furnace, taking out the powder, and grinding in a large mortar for 20-30 minutes to obtain the rod-shaped ZnO nano material modified by the Au nano particles;
(7) putting the dried powder of the rod-shaped ZnO nano material modified by the Au nano particles into a mortar, and grinding for 30 minutes; then, dropping deionized water (the mass ratio of the nano material to the water is 5:1) into the mortar, and continuously grinding for 30 minutes to obtain viscous slurry; uniformly coating the paste on Al with annular Au electrode by using a brush 2 O 3 The outer surface of the ceramic tube is provided with a ceramic tube,forming a sensitive layer with the thickness of 40 microns, wherein the sensitive layer is required to completely cover the annular Au electrode;
(8) coating Al of rod-shaped ZnO nano material modified by Au nano particles 2 O 3 Drying the ceramic tube at 70 ℃ for 1 hour; then, a Ni-Cr alloy heating wire with the resistance value of 38 omega is penetrated through Al 2 O 3 And finally, welding the sensitive element on a six-pin tube seat and packaging to obtain the acetone gas sensor of the powder of the rod-shaped ZnO nano material modified by the Au nano particles.
Example 3
An isothermal acetone sensor is manufactured by taking a rod-shaped ZnO nano material modified by Au nano particles as a sensitive material, and as shown in figure 2, the sensor consists of an explosion-proof protective cover 1, a sensitive element 2 coated with the rod-shaped ZnO nano material loaded with the Au nano particles and a six-pin tube seat 3.
The specific manufacturing steps are as follows:
(1) adding 3g of NaOH into 42.0ml of deionized water, and magnetically stirring for 5 minutes to completely dissolve the NaOH, wherein the solution is marked as A solution;
(2) 0.9357g of ZnSO 4 ·7H 2 Dissolving O in 14.0ml of deionized water, and stirring for 5 minutes by magnetic force to completely dissolve the O, and marking as a solution B;
(3) slowly dropwise adding the solution B into the solution A in a water bath at 60 ℃, magnetically stirring until the dropwise adding is completed, diluting the solution with 50ml of deionized water, and transferring the solution into an oven to dry for 4 hours at 80 ℃; centrifuging the mixed solution with deionized water for multiple times to wash, drying the precipitate at 80 ℃ for 12 hours, taking out and grinding to obtain rod-shaped ZnO white powder;
(4) adding 0.1g of rod-shaped ZnO powder into 50ml of deionized water, and completely dissolving the rod-shaped ZnO powder under magnetic stirring;
(5) 0.07800ml of HAuCl was taken 4 Adding the solution (with the concentration of 55mmol/L) into the solution prepared in the step (4), and magnetically stirring at room temperature to completely dissolve the solution;
(6) 3.0ml of NH 3 ·H 2 Adding O into the solution obtained in the step (5), stirring for 2 hours, collecting the product by centrifugation, and adding deionized water and anhydrous alcoholWashing for multiple times, drying for 4 hours in an oven at 60 ℃, finally annealing the obtained powder for 1 hour at 350 ℃ by using a muffle furnace, taking out the powder, and grinding for 20-30 minutes in a large mortar to obtain a rod-shaped ZnO nano material modified by Au nano particles;
(7) putting the dried powder of the rod-shaped ZnO nano material modified by the Au nano particles into a mortar, and grinding for 30 minutes; then, dropping deionized water (the mass ratio of the nano material to the water is 5:3) into the mortar, and continuously grinding for 30 minutes to obtain viscous slurry; uniformly coating the paste on Al with annular Au electrodes by using a brush 2 O 3 Forming a sensitive layer with the thickness of 40 mu m on the outer surface of the ceramic tube, wherein the sensitive layer completely covers the annular Au electrode;
(8) coating Al of rod-shaped ZnO nano material modified by Au nano particles 2 O 3 Drying the ceramic tube at 70 ℃ for 1 hour; then, a Ni-Cr alloy heating wire with the resistance value of 38 omega is penetrated through Al 2 O 3 And finally welding the sensitive element on a six-pin tube seat and packaging to obtain the acetone gas sensor of the powder of the rod-shaped ZnO nano material modified by the Au nano particles.
The ZnO nanocrystals obtained in the above examples were observed, and the results in the examples are similar, so that the description will be given by referring to example 1 only. As shown in FIG. 1, (a) shows that the Au nanoparticle-modified ZnO nanocrystals were rod-shaped crystals, and (b) shows that the particle size of the Au nanoparticle-modified rod-shaped ZnO nanomaterial was 50 nm; as shown in fig. 3, the XRD spectrum of the sample showed characteristic peaks of ZnO, indicating that the sample contained ZnO crystals.
The performance of the acetone sensor manufactured in each of the above examples was measured, and the results of each example were similar, so that the description will be given by only referring to example 1. As shown in fig. 4, when the device was operated at 172 c, the sensitivity of the device increased with increasing acetone concentration, and the curve showed a good linear relationship over the range of 10-200ppm acetone concentration. As shown in FIG. 5, when the device was operated at 172 ℃ and acetone concentration was 100ppm, the response time of the device was 1 second and the recovery time of the device was 24 seconds. The method shows excellent response recovery characteristics and has good detection on acetone gas. As shown in FIG. 6, when the device is operated at 172 ℃ and the gas concentration is 100ppm, the device has higher sensitivity to acetone than other detection gases, and the device shows good selectivity.
Materials, reagents and experimental equipment related to the embodiment of the invention are all commercial products in the field of sensor materials if no special description is provided.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. Any changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (9)
1. The preparation method of the rod-shaped ZnO nano material loaded with the Au nano particles is characterized in that crystals are rod-shaped crystals, the average grain diameter of crystal particles is 50nm, and the Au nano particles are uniformly loaded on the surfaces of the ZnO nano particles;
the preparation method comprises the following steps:
step one, preparing rodlike ZnO by a hydrothermal method to obtain ZnO white powder of rodlike crystals;
step two, preparing the rod-shaped ZnO nano material modified by the Au nano particles as follows:
s21, adding 0.02-0.1 g of the rod-shaped ZnO powder prepared in the step one into 25-50 ml of water to completely dissolve the rod-shaped ZnO powder;
s22 HAuCl with the concentration of 45-60 mmol/L and the concentration of 0.04-0.08 ml 4 Adding the solution into the solution prepared in the S21, and uniformly mixing;
s23 mixing 1.0-3.0 ml of NH 3 ·H 2 Adding O into the mixed solution prepared by the S22, and reacting for 1.5-3 hours;
s24, collecting the reaction product prepared in S23, washing the reaction product with deionized water and anhydrous alcohol, drying the reaction product for 3-5 hours at 55-70 ℃, finally, annealing the obtained powder for 1-2 hours at 340-360 ℃ by using a muffle furnace, taking out the powder, and grinding the powder for 20-30 minutes to obtain the rod-shaped ZnO nano material modified by the Au nano particles;
the method for preparing the rod-shaped ZnO in the first step comprises the following steps:
s11, adding 1-4 g of NaOH into 30-45 ml of water to completely dissolve the NaOH, and marking as solution A;
s12 mixing 0.5-1.0 g ZnSO 4 Dissolving the mixture in 10-15 ml of water to completely dissolve the mixture, and marking the solution as a solution B;
S13A, placing the solution in a water bath at 55-70 ℃, dropwise adding the solution B into the solution A, and stirring while dropwise adding; then diluting the solution with 40-60 ml of water, and drying at 60-80 ℃ for 4-6 hours; and then centrifugally washing the mixed solution, drying the precipitate for 12-24 hours at the temperature of 60-80 ℃, taking out and grinding to obtain rod-shaped ZnO white powder.
2. The method for preparing a rod-like ZnO nanomaterial supporting Au nanoparticles according to claim 1, wherein the solvent water used in the first and second steps is deionized water or ultrapure water.
3. The method for preparing Au nanoparticle-supported rod-shaped ZnO nanomaterial according to claim 1, wherein the dropping speed of the solution B into the solution a in step S13 is 1 drop/sec.
4. The application of the rod-shaped ZnO nanomaterial loaded with Au nanoparticles prepared by the preparation method of claim 1 in an acetone gas sensor is characterized in that the rod-shaped ZnO nanomaterial loaded with Au nanoparticles is coated on a sensitive element of the sensor.
5. The application of the rod-shaped ZnO nanomaterial loaded with Au nanoparticles in an acetone gas sensor as claimed in claim 4, wherein the thickness of a sensitive layer formed on a sensitive element by the rod-shaped ZnO nanomaterial loaded with Au nanoparticles is 20-40 μm.
6. The use of the Au nanoparticle-supported rod-shaped ZnO nanomaterial in an acetone gas sensor according to claim 4, wherein the acetone gas sensor comprises an explosion-proof cover, a sensitive element coated with the Au nanoparticle-supported rod-shaped ZnO nanomaterial, and a hexapod.
7. The application of the rod-shaped ZnO nanomaterial loaded with Au nanoparticles in the acetone gas sensor as claimed in claim 4, wherein the preparation method of the acetone gas sensor comprises the following steps:
(1) preparing a rod-shaped ZnO nano material loaded with Au nano particles into slurry, and uniformly coating the slurry on Al with an annular Au electrode 2 O 3 Forming a sensitive layer with the thickness of 20-40 mu m on the outer surface of the ceramic tube, wherein the sensitive layer completely covers the annular Au electrode;
(2) drying the element obtained in the step (1) at the temperature of 60-80 ℃ for 1-3 hours;
(3) then, passing the Ni-Cr alloy heating wire with the resistance value of 35-40 omega through Al 2 O 3 The ceramic tube is used as a heating wire to obtain a sensitive element;
(4) and welding the sensitive element on the six-pin tube seat and packaging.
8. The application of the rod-shaped ZnO nanomaterial loaded with Au nanoparticles in the acetone gas sensor according to claim 7, wherein the slurry in the step (1) is prepared by putting the dried rod-shaped ZnO nanomaterial loaded with Au nanoparticles into a mortar and grinding for 20-30 minutes; and then dripping water into the mortar and continuing to grind for 20-30 minutes to obtain viscous slurry.
9. The application of the Au nanoparticle-loaded rod-shaped ZnO nanomaterial in an acetone gas sensor according to claim 8, wherein the mass ratio of the Au nanoparticle-loaded rod-shaped ZnO nanomaterial to water during slurry preparation is 5: 1-5: 3.
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