CN108717072A - A kind of light activated formaldehyde gas sensor and its preparation process - Google Patents
A kind of light activated formaldehyde gas sensor and its preparation process Download PDFInfo
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- CN108717072A CN108717072A CN201810495604.6A CN201810495604A CN108717072A CN 108717072 A CN108717072 A CN 108717072A CN 201810495604 A CN201810495604 A CN 201810495604A CN 108717072 A CN108717072 A CN 108717072A
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- 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
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- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
- C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
- C01P2004/84—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases one phase coated with the other
Abstract
The invention belongs to sensor technical field, a kind of light activated formaldehyde gas sensor and its preparation process are provided.The sensor includes light source, gas sensitive and substrate, the gas sensitive is coated uniformly on the substrate surface, the gas sensitive ingredient is hollow microsphere zinc oxide stannic oxide hetero-junctions composite nano materials, the gas sensitive coating thickness is 1 μm~100 μm, and use condition is to be irradiated in wave band 365nmLED lamp beads.The response of the formaldehyde sensor PARA FORMALDEHYDE PRILLS(91,95) gas of the present invention is higher, while having the characteristics that better choice, sensitivity, stability and can work at room temperature.
Description
Technical field
The invention belongs to sensor technical fields, and in particular to a kind of light activated formaldehyde gas sensor and its prepare work
Skill.
Background technology
Gas sensor is mainly used for the detection of various gases, especially environmental gas.To toxic, pernicious gas in environment
The requirement of contamination control accelerates the research of gas sensor.Gas sensor is mainly used for CO gas in the prior art
Detection, the detection of methane gas, the detection of coal gas, the detection of freon (R11, R12), the detection of ethyl alcohol, human body in expiration
Detection of oral cavity halitosis etc..It is converted into electric signal by gaseous species and its with concentration dependent information, according to these telecommunications
Number power be obtained with under test gas in the environment there are the related information of situation, so as to be detected, supervise
Control, alarm；The interface circuit and automatic detection of computer composition, control and alarm system can also be passed through.Wherein, though formaldehyde with compared with
Low concentration exists in the environment, but the formaldehyde of low concentration still has harmful effect to the health of people and environmental pollution, because
This how rapid and accurate determination go out the content of formaldehyde for the improvement of air environment provide according to become this field a big hot spot ask
Topic.
And semiconductor gas sensor plays the part of important role in industrial exhaust gas, the fields such as Indoor Environment Detection, has
Wide application background.But semiconductor gas sensor is unsatisfactory to the characteristic of gas at ambient temperature, it usually needs
Heater strip is installed on gas sensor element, improves the temperature of element manipulation, overcomes the reaction activity that semi-conducting material is high, is increased
The sensitivity characteristic of strong gas sensor.But by the performance of mode of heating raising element, there are many deficiencies and defect, not only increases
Add the power consumption of energy, is also easy that the imflammable gas in environment can be ignited, causes security risk.Meanwhile it can also make element function
Deteriorate, shortens the working life.In recent years, research shows that light exciting method, which may be used, replaces heating, improve gas sensor and exist
Performance under room temperature.It is excited by the LED light of low-power and provides energy for gas sensitive, effectively reduce gas sensor
Operating temperature, accelerate response and recovery of the element under test gas, extend element service life.
Therefore, it is simple to prepare a kind of processing step, at low cost and PARA FORMALDEHYDE PRILLS(91,95) high selectivity, can be in ultraviolet excitation
Under work at room temperature, a kind of novel methylene sensor that stability and restorability are strong become those skilled in the art urgently
Technical problem to be solved.
Invention content
It is high, stable that it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of responses of PARA FORMALDEHYDE PRILLS(91,95) gas
A kind of property novel methylene sensor and preparation method thereof that is strong, and can working at room temperature.
Technical scheme of the present invention：
A kind of light activated formaldehyde gas sensor, including light source, gas sensitive and substrate, the gas sensitive uniformly apply
The substrate surface is overlayed on, gas sensitive ingredient is hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials,
Coating thickness is 1 μm~100 μm.
The hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials are empty by internal layer stannic oxide nanometer
Bulbus cordis and the combination of outer oxide zinc encasement are constituted, and it is different that the oxide coated by zinc shell accounts for hollow microsphere zinc oxide stannic oxide bilayer
The 10%-30% of matter knot composite nano materials quality.
The sphere diameter of the hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials is 100nm-
300nm, spherome surface are uniformly distributed meso-hole structure；The a diameter of 100nm-250nm of internal layer stannic oxide nanometer hollow ball, titanium dioxide
Tin nano-hollow ball shell thickness is 10nm-20nm, and outer oxide zinc encasement is 20nm-40nm, the sky of internal layer and outer interlayer
Gap is 3nm-5nm, and internal layer is 30nm-50nm with the shell thickness that outer layer is constituted.
The light source is the ultraviolet leds light source of wavelength 365nm, power 75mW.
The substrate is the Si substrates with Au electrodes.
A kind of preparation process of light activated formaldehyde gas sensor, includes the following steps：
Operation principle：Formaldehyde gas sensor of the present invention is Gas Sensors of Electric Resistance Semiconductors, and Main Basiss element is inhaled
Resistance variations before and after attached gas are detected, and are physically or chemically inhaled, are desorbed on gas sensitive using under test gas,
Cause the change in electrical properties such as material resistance to reach testing goal.Formaldehyde sensor of the present invention is under LED ultraviolet lights
Operating temperature is room temperature；Sensor resistance in air and is exposed in formaldehyde gas and changes and sensor signal is made to produce
It is raw；The real-time monitoring signals of sensor are the variations of sensor resistance.
Step 1 prepares stannic oxide nanometer hollow ball：A diameter of 500nm-1 μm of carbosphere is mixed with ethyl alcohol
It is even, obtain the suspending liquid A that carbosphere material concentration is 0.2-0.3g/mL；Tin source is dissolved in ethyl alcohol, tin ion concentration is obtained
For the suspension B of 3.2-4.8mol/L；By two kinds of suspension by volume 1:1 mixing, ultrasonic agitation are mixed after mixing
Close liquid；Then mixed liquor is stood 24 hours, filtering is washed with ethyl alcohol, filtered, it is dry, obtain carbon ball tin mixture；Carbon ball tin
Mixture is calcined 3 hours under 500 DEG C of temperature conditions, after removing carbon ball, obtains stannic oxide nanometer hollow ball；
Step 2 prepares zinc-tin precursor solution：Stannic oxide nanometer hollow ball difference prepared by zinc source and step 1
Deionized water is dissolved in, it is a concentration of for the solution A and stannic oxide nanometer hollow ball of 0.05-0.1mol/L to obtain zinc ion concentration
The suspension C of 0.03-0.04g/mL, by solution A and suspension C by volume 1:1 mixing after stirring evenly, adjusts pH into
Property, obtain zinc-tin precursor solution；
Step 3 prepares the aqueous solution of cationic surfactant active of a concentration of 0.03-0.05mol/L, for connect zinc from
Son and stannic oxide nanometer hollow ball；
Step 4 prepares hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials：Step 2 is obtained
Zinc-tin precursor solution by volume 1 is mixed with the surfactant solution that step 3 obtains:1 mixing, after stirring evenly, in
Heating reaction 16 hours, are washed repeatedly with deionized water and ethyl alcohol under the conditions of temperature is 120 DEG C, under the conditions of temperature is 60 DEG C
It is 10 hours dry；It is calcined 3 hours under the conditions of being finally 600 DEG C in temperature, it is different to obtain hollow microsphere zinc oxide stannic oxide bilayer
Matter knot composite nano materials；
Step 5 prepares formaldehyde gas sensor：The hollow microsphere zinc oxide stannic oxide prepared in step 4 is double-deck
Hetero-junctions composite nano materials are dispersed in organic solvent, formed 5mg/mL~15mg/mL dispersion liquid, by dispersion liquid with
The concentration of 2.5L/ ㎡~4L/ ㎡ is coated to substrate surface, and formaldehyde gas sensor is obtained after dry.
Organic solvent in step 5 is ethyl alcohol, acetone, tetrahydrofuran, n,N-Dimethylformamide, N, N- dimethyl second
The combination of one or more of amide, N-Methyl pyrrolidone.The coating method is spraying, roller coating or dipping.
Beneficial effects of the present invention：
1. the present invention obtains hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials using template, lead to
It crosses and uses carbon ball as template, prepare double shells hollow microsphere structure using surfactant, which can greatly improve material
The specific surface area of material so that the response area of material and tested gas increases, and improves adsorption capacity of the gas sensitive to gas, and
The metal oxide bulb diameter of preparation is uniform, and size is controllable, single layer thickness of the shell 10nm-30nm, and the double-deck thickness of the shell is less than 50nm, far
It is that a kind of equipment investment is small less than the average thickness of similar material single layer shell 100nm, the simple shell nano ball shell of technological process
Material preparation scheme.
2. being smaller than 5nm between composite material double shells of the present invention, portion can be in contact, stannic oxide and oxygen
Hetero-junctions is will produce between change Zinc material, electronics can be guided to be deposited on surfacing, the air-sensitive of strengthening material selects performance.
Therefore composite material of the present invention is stablized with chemical property, the good advantage of PARA FORMALDEHYDE PRILLS(91,95) gas air-sensitive performance.
3. inventive sensor is excited using ultraviolet light, ultraviolet light by material surface will excite valence-band electrons into
Enter conduction band, increase sheet electron concentration, strengthens air-sensitive response, and composite material of the present invention is since single layer thickness of the shell is relatively thin, into one
Step optimizes ultraviolet excitation effect, will greatly improve the combination efficiency of material and tested gas molecule, thus improves gas sensing property
Can, so that working sensor required temperature is declined, can work at room temperature, therefore do not need heater element, avoid material and exist
Material aging caused by working under hot environment and damage.
Description of the drawings
Fig. 1 is hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials X-ray diffractogram of the present invention.
Fig. 2 is the microcosmic shape of hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials electronic transmission of the present invention
Looks figure.
Fig. 3 is a kind of gas sensor test equipment schematic diagram of ultraviolet excitation of the embodiment of the present invention.
Fig. 4 is electricity of the lower formaldehyde sensor of the present invention of room temperature condition wave band 365nm light excitation to 1-100ppm formaldehyde gas
Hinder change curve.
Fig. 5 is for formaldehyde sensor of the present invention to other escaping gas and first under the excitation of room temperature condition wave band 365nm light
Aldehyde compares response diagram.
Specific implementation mode
Below in conjunction with attached drawing and technical solution, the specific implementation mode that further illustrates the present invention.
Embodiment 1
A kind of light activated formaldehyde gas sensor, including light source, gas sensitive and substrate, the gas sensitive uniformly apply
The substrate surface is overlayed on, gas sensitive ingredient is hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials,
Coating thickness is 1 μm~100 μm.The hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials are by internal layer
Stannic oxide nanometer hollow ball and the combination of outer oxide zinc encasement are constituted, and the oxide coated by zinc shell accounts for composite nano materials matter
The 10%-30% of amount.The composite nano materials sphere diameter is 100nm-300nm, and internal layer stannic oxide nanometer is hollow
Bulb diameter is about 100nm-250nm, and stannic oxide shell thickness is about 10nm-20nm, and outer oxide cadmia layer is about 20nm-
40nm, gap is about 3nm-5nm between two layers of spherical shell, and whole shell thickness is 30nm-50nm, and spherome surface is uniformly distributed mesoporous
Structure.
Step 1 prepares stannic oxide nanometer hollow ball：A diameter of 500nm-1 μm of carbosphere is mixed with ethyl alcohol
It is even, obtain the suspending liquid A that carbosphere material concentration is 0.25g/mL；In ethanol by Tin tetrachloride pentahydrate dissolving, five are obtained
It is hydrated the suspension B of a concentration of 1mol/L of butter of tin；By two kinds of suspension by volume 1:1 mixing, ultrasonic agitation mixing are equal
Mixed liquor is obtained after even；Then mixed liquor is stood 24 hours, washs filtering with ethyl alcohol, the solid content being obtained by filtration is placed in dry
It is dry in dry case, carbon ball tin mixture is obtained, carbon ball tin mixture is put into Muffle furnace after being fired to 500 DEG C of removal carbon balls and is obtained
Obtain SnO2 nano-hollow balls；
Step 2 prepares zinc-tin precursor solution：SnO2 nano-hollow balls difference prepared by zinc acetate and step 1 is molten
Enter deionized water, obtains the solution A and a concentration of 0.03g/mL of SnO2 nano-hollow balls that zinc acetate concentration is 0.08mol/L
Suspension B, by two kinds of liquid by volume 1:1 mixing adjusts pH to neutrality with ammonium hydroxide after stirring evenly, obtains zinc-tin forerunner
Liquid solution；
Step 3 prepares the cetyl trimethylammonium bromide aqueous surfactant solution of a concentration of 0.042mol/L, uses
In connection zinc ion and SnO2 nano-hollow balls；
Step 4 prepares hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials：It will be made in step 2
Standby zinc-tin precursor solution mixes by volume 1 with the surfactant solution prepared in step 3:1 mixing, after stirring evenly,
The liquid of acquisition is transferred in polytetrafluoroethylene (PTFE) stainless steel autoclave, reaction is heated in drying box；After heating
Mixed liquor takes out, and with deionized water and ethyl alcohol washing sample repeatedly, sample is positioned in Muffle furnace after dry and is fired to 600 DEG C
It is prepared into hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials after removal surfactant；
Step 5 prepares formaldehyde gas sensor：The hollow microsphere zinc oxide stannic oxide prepared in step 4 is double-deck
Hetero-junctions composite nano materials are dispersed in ethyl alcohol, are formed the dispersion liquid of 5mg/mL~15mg/mL, are taken the 40 μ L dispersion liquids of μ L~60
It is coated to substrate surface, formaldehyde gas sensor is obtained after dry.
The hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials sample obtained in the present embodiment, through X
X ray diffraction, electron microscope transmission, obtained result are shown in Fig. 1, Fig. 2 in attached drawing.
Embodiment 2
It is shown in Figure 3, a kind of light activated formaldehyde gas sensor test system provided in this embodiment, including general-purpose
Table, fan, sensor, ultraviolet leds, heater.Gas sensor is thick-film resistor type sensor, sensitive material smearing thickness
About 1 μm~100 μm.
Wherein, the gas sensor includes Semiconductor gas sensors material and substrate.
Semiconductor gas sensors material is hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials, by template
And prepared by high-temperature calcination, single nano-hollow bulb diameter is about 100-300nm, and shell thickness 30-50nm is applied with organic solvent
It smears in substrate surface.
Substrate is the Si substrates with Au electrodes.
Wherein ultraviolet leds are a length of 365nm of light wave, and power is the light bead LED light source of 75mW.
Wherein, the call parameter setting of the multimeter is arranged by computer.
Wherein, the light source is placed on the vertical plane of gas sensor, specific sensor surface 5cm.
The gas sensor of the present embodiment is used to detect the formaldehyde gas of 1-100ppm.
Shown in Figure 1, for gas sensor as under air conditions, operating temperature is room temperature.By the ends PC, general-purpose is set
The call parameter of table, the resistance value on detection sensor surface form transducing signal.Gas sensor swashs by certain time light
Hair, resistance value tend towards stability.The gas sensor shown by the ends PC in air with using air as the various concentration first of background
Resistance variations in aldehyde environment, the response as sensor restore signal.Fig. 4 is during the excitation of room temperature condition wave band 365nm light is lower
Resistance variations of the empty microballoon zinc oxide stannic oxide double layer heterojunction composite nano materials gas sensor to 1-100ppm formaldehyde
Curve, it is seen that sensor shows good response to low concentration formaldehyde, can accurately be detected for 1ppm concentration formaldehyde gas, extensive
The multiple and response time is faster than same type of sensor, and can work normally at room temperature.
Embodiment 3
A kind of light activated formaldehyde gas sensor, including light source, gas sensitive and substrate, the gas sensitive uniformly apply
The substrate surface is overlayed on, gas sensitive ingredient is hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials,
Coating thickness is 1 μm~100 μm.The hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials are by internal layer
Stannic oxide nanometer hollow ball and the combination of outer oxide zinc encasement are constituted, and the oxide coated by zinc shell accounts for composite nano materials matter
The 10%-30% of amount.The composite nano materials sphere diameter is 100nm-300nm, and internal layer stannic oxide nanometer is hollow
Bulb diameter is about 100nm-250nm, and stannic oxide shell thickness is about 10nm-20nm, and outer oxide cadmia layer is about 20nm-
40nm, gap is about 3nm-5nm between two layers of spherical shell, and whole shell thickness is 30nm-50nm, and spherome surface is uniformly distributed mesoporous
Structure.
Step 1 prepares stannic oxide nanometer hollow ball：A diameter of 500nm-1 μm of carbosphere is mixed with ethyl alcohol
It is even, obtain the suspending liquid A that carbosphere material concentration is 0.28g/mL；In ethanol by the dissolving of two hydrated stannous chlorides, two are obtained
The suspension B of a concentration of 1.2mol/L of hydrated stannous chloride；By two kinds of suspension by volume 1:1 mixing, ultrasonic agitation mixing
Mixed liquor is obtained after uniformly；Then mixed liquor is stood 24 hours, washs filtering with ethyl alcohol, the solid content being obtained by filtration is placed in
It is dry in drying box, carbon ball tin mixture is obtained, carbon ball tin mixture is put into Muffle furnace after being fired to 500 DEG C of removal carbon balls
Obtain SnO2 nano-hollow balls；
Step 2 prepares zinc-tin precursor solution：SnO2 nano-hollow balls difference prepared by zinc sulfate and step 1 is molten
Enter deionized water, obtains the solution A and a concentration of 0.04g/mL of SnO2 nano-hollow balls of a concentration of 0.06mol/L of zinc sulfate
Suspension B, by two kinds of liquid by volume 1:1 mixing adjusts pH to neutrality with ammonium hydroxide after stirring evenly, obtains zinc-tin forerunner
Liquid solution；
Step 3, the octadecyl dimethyl benzyl ammonium bromide surfactant for preparing a concentration of 0.038mol/L are water-soluble
Liquid, for connecting zinc ion and SnO2 nano-hollow balls；
Step 4 prepares hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials：It will be made in step 2
Standby zinc-tin precursor solution mixes by volume 1 with the surfactant solution prepared in step 3:1 mixing, after stirring evenly,
The liquid of acquisition is transferred in polytetrafluoroethylene (PTFE) stainless steel autoclave, reaction is heated in drying box；After heating
Mixed liquor takes out, and with deionized water and ethyl alcohol washing sample repeatedly, sample is positioned in Muffle furnace after dry and is fired to 500 DEG C
It is prepared into hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials after removal surfactant；
Step 5 prepares formaldehyde gas sensor：The hollow microsphere zinc oxide stannic oxide prepared in step 4 is double-deck
Hetero-junctions composite nano materials are dispersed in acetone, are formed the dispersion liquid of 5mg/mL~15mg/mL, are taken the 40 μ L dispersion liquids of μ L~60
It is coated to substrate surface, formaldehyde gas sensor is obtained after dry.
The material for the semiconductor gas sensor that the present embodiment is selected is that hollow microsphere zinc oxide stannic oxide bilayer is heterogeneous
Tie composite nano materials, test gas is 100ppm formaldehyde, ammonium hydroxide, ethyl alcohol, benzene, methanol, acetone.Fig. 5 is formaldehyde of the present invention
Sensor compares response diagram under the excitation of room temperature condition wave band 365nm light to other escaping gas and formaldehyde.Visible light transducer
The response of PARA FORMALDEHYDE PRILLS(91,95) gas is the several times responded to other gases, show the response sensitivity of the sensor PARA FORMALDEHYDE PRILLS(91,95) gas compared with
It is high.
As known from the above examples, the present invention uses template, and Zinc oxide particles package is realized by the synthesis calcining of two steps
Stannic oxide nanometer hollow ball forms hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials, double layer hollow
The microcosmic porous characteristic of micro-sphere structure can greatly improve adsorption capacity of the gas sensitive to gas, and double-shell structure increases
The big specific surface area of material, enhances the air-sensitive performance of material.And it wraps up in the composite material of Zinc oxide particles and having formd
Hetero-junctions enhances the characteristic of air-sensitive performance advantage material so that electronics is migrated.Using LED pairs of 365nm wave bands
Material is excited, so that material surface electron concentration greatly increases, enhances response intensity of the material to escaping gas,
So that material can work at room temperature, and electronics transits to tested gas molecule LOMO from the HOMO tracks of material surface
The phenomenon that track, greatly strengthens selectivity of the material to gas with various, while enhancing the recovery of material PARA FORMALDEHYDE PRILLS(91,95) gas response
Performance accelerates the desorption of gas molecule.
Claims (6)
1. a kind of light activated formaldehyde gas sensor, which is characterized in that the light activated formaldehyde gas sensor includes
Light source, gas sensitive and substrate, the gas sensitive are coated uniformly on the substrate surface, and gas sensitive ingredient is hollow microsphere
Zinc oxide stannic oxide double layer heterojunction composite nano materials, coating thickness are 1 μm~100 μm；The hollow microsphere zinc oxide
Stannic oxide double layer heterojunction composite nano materials are combined by internal layer stannic oxide nanometer hollow ball and outer oxide zinc encasement
It constitutes, the oxide coated by zinc shell accounts for hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials quality
10%-30%；The sphere diameter of the hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials is 100nm-
300nm, spherome surface are uniformly distributed meso-hole structure；The a diameter of 100nm-250nm of internal layer stannic oxide nanometer hollow ball, titanium dioxide
Tin nano-hollow ball shell thickness is 10nm-20nm, and outer oxide zinc encasement is 20nm-40nm, the sky of internal layer and outer interlayer
Gap is 3nm-5nm, and internal layer is 30nm-50nm with the shell thickness that outer layer is constituted.
2. light activated formaldehyde gas sensor according to claim 1, which is characterized in that the light source is wavelength
The ultraviolet leds light source of 365nm, power 75mW.
3. light activated formaldehyde gas sensor according to claim 1 or 2, which is characterized in that the substrate is band
There are the Si substrates of Au electrodes.
4. a kind of preparation process of light activated formaldehyde gas sensor, which is characterized in that steps are as follows：
Step 1 prepares stannic oxide nanometer hollow ball：A diameter of 500nm-1 μm of carbosphere is uniformly mixed with ethyl alcohol, is obtained
To the suspending liquid A that carbosphere material concentration is 0.2-0.3g/mL；Tin source is dissolved in ethyl alcohol, obtaining tin ion concentration is
3.2-4.8mol/L suspension B；By two kinds of suspension by volume 1:1 mixing, ultrasonic agitation are mixed after mixing
Liquid；Then mixed liquor is stood 24 hours, filtering is washed with ethyl alcohol, filtered, it is dry, obtain carbon ball tin mixture；Carbon ball tin is mixed
It closes object to calcine 3 hours under 500 DEG C of temperature conditions, after removing carbon ball, obtains stannic oxide nanometer hollow ball；
Step 2 prepares zinc-tin precursor solution：Stannic oxide nanometer hollow ball prepared by zinc source and step 1 is dissolved in respectively
It is a concentration of for the solution A and stannic oxide nanometer hollow ball of 0.05-0.1mol/L to obtain zinc ion concentration for deionized water
The suspension C of 0.03-0.04g/mL, by solution A and suspension C by volume 1:1 mixing after stirring evenly, adjusts pH into
Property, obtain zinc-tin precursor solution；
Step 3 prepares the aqueous solution of cationic surfactant active of a concentration of 0.03-0.05mol/L, for connect zinc ion with
Stannic oxide nanometer hollow ball；
Step 4 prepares hollow microsphere zinc oxide stannic oxide double layer heterojunction composite nano materials：The zinc that step 2 is obtained
Tin precursor solution mixes by volume 1 with the surfactant solution that step 3 obtains:1 mixing, after stirring evenly, in temperature
Heating reaction 16 hours, are washed repeatedly with deionized water and ethyl alcohol under the conditions of being 120 DEG C, then at temperature be under the conditions of 60 DEG C it is dry
10 hours；It is calcined 3 hours under the conditions of being finally 600 DEG C in temperature, obtains hollow microsphere zinc oxide stannic oxide double layer heterojunction
Composite nano materials；
Step 5 prepares formaldehyde gas sensor：The hollow microsphere zinc oxide stannic oxide bilayer prepared in step 4 is heterogeneous
Knot composite nano materials are dispersed in organic solvent, the dispersion liquid of 5mg/mL~15mg/mL are formed, by dispersion liquid with 2.5L/ ㎡
The concentration of~4L/ ㎡ is coated to substrate surface, and formaldehyde gas sensor is obtained after dry.
5. preparation process according to claim 4, which is characterized in that the organic solvent in step 5 is ethyl alcohol, acetone, four
The group of one or more of hydrogen furans, n,N-Dimethylformamide, n,N-dimethylacetamide, N-Methyl pyrrolidone
It closes.
6. preparation process according to claim 4 or 5, which is characterized in that the coating method is spraying, roller coating or leaching
Stain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810495604.6A CN108717072A (en) | 2018-05-15 | 2018-05-15 | A kind of light activated formaldehyde gas sensor and its preparation process |
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| CN109613070A (en) * | 2019-01-02 | 2019-04-12 | 大连理工大学 | One kind being based on two dimension MXene/SnO2Ammonia gas sensor, preparation process and the application of hetero-junctions |
| CN109850934A (en) * | 2019-01-31 | 2019-06-07 | 扬州睿德石油机械有限公司 | A kind of preparation method of metal oxide suspension and the method for forming high-specific surface area air-sensitive coating is sprayed under liquid material flame |
| CN110452478A (en) * | 2019-07-22 | 2019-11-15 | 河源市星火科技有限公司 | A kind of down toy and its processing method using PVC complex plastic material |
| CN110455900A (en) * | 2019-07-31 | 2019-11-15 | 广州大学华软软件学院 | A kind of formaldehyde sensitive composite material and gas sensor and preparation method thereof |
| CN110455900B (en) * | 2019-07-31 | 2022-05-24 | 广州大学华软软件学院 | Formaldehyde-sensitive composite material, gas-sensitive sensor and preparation method of formaldehyde-sensitive composite material |
| CN110589875A (en) * | 2019-09-17 | 2019-12-20 | 复旦大学 | Gas-sensitive nano material based on single-layer ordered tin oxide nano bowl branched zinc oxide nanowire structure, preparation process and application thereof |
| CN110589875B (en) * | 2019-09-17 | 2021-10-26 | 复旦大学 | Gas-sensitive nano material based on single-layer ordered tin oxide nano bowl branched zinc oxide nanowire structure, preparation process and application thereof |
| CN110687170A (en) * | 2019-11-12 | 2020-01-14 | 大连理工大学 | TiO based on ultraviolet light wave band2/SnO2Gas sensor and preparation method |
| CN113686926A (en) * | 2021-07-30 | 2021-11-23 | 南昌攀藤科技有限公司 | Formaldehyde sensor and preparation method thereof |
| CN113686926B (en) * | 2021-07-30 | 2024-03-29 | 南昌攀藤科技有限公司 | Formaldehyde sensor and preparation method thereof |
| CN117571794A (en) * | 2024-01-15 | 2024-02-20 | 电子科技大学中山学院 | Laser enhancement type zinc oxide formaldehyde detection device |
| CN117571794B (en) * | 2024-01-15 | 2024-03-19 | 电子科技大学中山学院 | Laser enhancement type zinc oxide formaldehyde detection device |
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