CN108254019A - Highly sensitive environmental quality monitoring system based on graphene - Google Patents
Highly sensitive environmental quality monitoring system based on graphene Download PDFInfo
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- CN108254019A CN108254019A CN201711490155.8A CN201711490155A CN108254019A CN 108254019 A CN108254019 A CN 108254019A CN 201711490155 A CN201711490155 A CN 201711490155A CN 108254019 A CN108254019 A CN 108254019A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
Abstract
The present invention relates to a kind of highly sensitive environmental quality monitoring system based on graphene, the environmental quality monitoring system includes base station and the atmosphere pollution monitor being connected respectively with base station and meteorological monitor；The atmosphere pollution monitor includes microprocessor and coupled respectively function sensor group, power module and communication module, and function sensor group includes sensor interface and PM10 sensors coupled respectively, PM2.5 sensors, SO2Sensor, NO2Sensor, O3Sensor, CO sensors, temperature sensor and humidity sensor；The NO2Sensor is thick-film type, uses ceramic substrate as substrate, is equipped on the ceramic substrate and inserts finger electrode, inserts finger electrode and is equipped with sensitive thin film, the sensitive thin film is ZnO nano piece and Au/SnO2The mixture of/RGO composite materials.
Description
Technical field
The present invention relates to environmental monitoring more particularly to a kind of highly sensitive environmental quality monitoring systems based on graphene
System.
Background technology
It at present, can not also be by same base station simultaneously to atmosphere pollution quality in existing environmental monitoring system
It is monitored with meteorology；Also, the transducer sensitivity based on environmental monitoring is not high.
Invention content
The present invention is intended to provide a kind of highly sensitive environmental quality monitoring system based on graphene, to solve set forth above ask
Topic.
A kind of highly sensitive environmental quality monitoring system based on graphene, the environment are provided in the embodiment of the present invention
Mass monitoring system includes base station and the atmosphere pollution monitor being connected respectively with base station and meteorological monitor；It is described
Base station includes computer, data pre-processor and ups power, and computer is connected with data pre-processor, ups power respectively with
Computer is connected with data pre-processor；The atmosphere pollution monitor includes microprocessor and difference is coupled
Function sensor group, power module and the communication module connect, function sensor group include sensor interface and respectively with its phase
PM10 sensors, PM2.5 sensors, the SO of connection2Sensor, NO2Sensor, O3Sensor, CO sensors, temperature sensor
With humidity sensor；The weather monitoring instrument includes function sensor group and data collector, and data collector is pre- by data
Processor is connected with computer, and function sensor group includes the wind transducer, the wind speed that are connected respectively with data collector
Sensor and the baroceptor being connected with data pre-processor；
The NO2Sensor is thick-film type, uses ceramic substrate as substrate, is equipped on the ceramic substrate and inserts finger electrode,
It inserts and refers to electrode equipped with sensitive thin film, the sensitive thin film is ZnO nano piece and Au/SnO2The mixture of/RGO composite materials.
The technical solution that the embodiment of the present invention provides can include the following benefits：
Technical scheme of the present invention can be by same base station to PM10, PM2.5, SO2、NO2、O3, CO, temperature, humidity,
Wind direction, wind speed and air pressure are monitored, and have many advantages, such as simple in structure, and Monitoring Performance is accurate, in addition, the NO2Sensor base
In ZnO nano piece and Au/SnO2The mixture of/RGO composite materials has the advantages that high sensitivity, response time are short.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
It obtains significantly or is recognized by the practice of the present invention.It should be understood that above general description and following detailed description are only
It is exemplary and explanatory, the present invention can not be limited.
Description of the drawings
Using attached drawing, the invention will be further described, but the embodiment in attached drawing does not form any limit to the present invention
System, for those of ordinary skill in the art, without creative efforts, can also obtain according to the following drawings
Other attached drawings.
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the structure diagram of atmosphere pollution monitor in Fig. 1；
Fig. 3 is the structure diagram that weather monitoring instrument is connected with base station in Fig. 1.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects being described in detail in claims, of the invention.
The embodiment of the present invention is related to a kind of highly sensitive environmental quality monitoring system based on graphene, with reference to Fig. 1-Fig. 3,
The environmental quality monitoring system includes base station and the atmosphere pollution monitor and weather monitoring that are connected respectively with base station
Instrument.
The base station includes computer, data pre-processor and ups power, and computer is connected with data pre-processor, UPS
Power supply is connected respectively with computer and data pre-processor.
The atmosphere pollution monitor includes microprocessor and function sensor group coupled respectively, power supply
Module and communication module, function sensor group include sensor interface and respectively coupled PM10 sensors,
PM2.5 sensors, SO2Sensor, NO2Sensor, O3Sensor, CO sensors, temperature sensor and humidity sensor.
Wherein, which is connected with municipal administration power supply or solar panels；The communication module is connected with computer.
Weather monitoring instrument includes function sensor group and data collector, and data collector passes through data pre-processor and meter
Calculation machine is connected, function sensor group include be connected respectively with data collector wind transducer, air velocity transducer and
The baroceptor being connected with data pre-processor.
Specifically, the NO2Sensor is a kind of NO based on graphene2Sensor, the senor operating temperature is in room
Under temperature, there is good sensitivity and faster response recovery time, be NO2The application of sensor provides more more options；This
The invention NO2Sensor is thick-film type, uses ceramic substrate as substrate, is equipped on the ceramic substrate and inserts finger electrode, inserted
Refer to electrode and be equipped with sensitive thin film, the sensitive thin film is ZnO nano piece and Au/SnO2The mixture of/RGO composite materials.
Preferably, which is 0.15mm.
The NO of the present invention2Sensor is for NO in the prior art2Operating temperature existing for sensor is higher, sensitivity is poor
Etc. technical problems, in the prior art, the NO based on INVENTIONConventional metal-oxide2Sensor needs to work at a higher temperature, increases
Add sensor in-fighting, and the NO based on grapheme material2Sensor is expected to realize and work at room temperature；Graphene is a kind of new
The carbon material of type, since its special atomic structure and complicated band structure make it have characteristic of semiconductor and metal spy simultaneously
Property, and with excellent electron transmission performance, be widely used in developing room temperature NO2Sensor.But since graphene surface is deposited
In dangling bonds, such as hydroxyl, carboxyl, epoxy group, the absorption of gas molecule is limited, the NO based on pure state grapheme material2It passes
Sensor is shown the shortcomings of poor, sensitivity is low, response recovery time is long to gas-selectively, and by being adulterated to graphene after,
Graphene can be obviously improved to NO2Sensitivity.And it is current, it is aoxidized using traditional gas sensitive, such as noble metal, metal
Object, conducting polymer etc. are grapheme modified and form ternary complex by them and are widely used in and improve graphene-based NO2
The sensing capabilities of sensor using the above method, can not only make each ingredient play the advantage to gas sensitization, and can adjust
The physicochemical properties of arthrolith mertenyl material are so as to improve sensing capabilities.Graphene composite material has been widely used for gas biography
The research of sensor, but graphene-based NO at room temperature2There are still poor selectivity, low, the response recovery time length of sensitivity etc. for sensor
Problem.
The sensitive thin film is ZnO nano piece and Au/SnO2The mixture of/RGO composite materials, and the mixture passes through
The processing of plasma is crossed, on the basis of the two combination so that the sensitive thin film produces unexpected technology effect
Fruit so that the sensitive performance of sensor greatly improves.Specifically, it is by Au/SnO in the above-mentioned sensitive thin film of the present invention2/RGO
Dispersant liquid drop is coated onto ZnO nano piece surface, and by the processing of plasma, so as to which the sensor sensing for forming described is thin
Film；The Au/SnO2/ RGO composite materials are dispersed in ZnO nano piece surface, and graphene sheet layer is combined with ZnO nano piece；
The Au/SnO2In/RGO composite materials, RGO is in lamella, Au and SnO2For nano-particle, modify on lamella RGO surfaces, it should
ZnO nano piece constitutes the Au/SnO2The natural dispersive mechanism of/RGO composite materials so that the Au/SnO2/ RGO composite woods
Material and NO2Contact area greatly increases, and produces unexpected technique effect, improves transducer sensitivity；In addition, reduction
Graphene oxide (RGO) and ZnO nano piece, SnO2, Au combine, by doped graphene, regulate and control the semiconducting behavior of graphene,
Graphene-based NO can be obviously improved2The sensitivity characteristic of sensor；Above-mentioned combination is to NO2Sensitization is played, improves sensitive material
The transmission rate of electronics in material, produces unexpected technique effect.
Specifically, in sensitive thin film described in technical solution of the present invention, the ZnO nano piece and Au/SnO2/ RGO composite woods
The mass ratio of material is 4:1.In technical solution of the present invention, further by controlling quality when doping so that the sensitive material
Produce unexpected technique effect so that the sensitive performance of sensor greatly improves.
Preferably, the ZnO nano piece is prepared by hydro-thermal method.Zinc oxide is a kind of semiconductor of good performance
Material, large-scale application is in fields such as air-sensitive, photoelectricity, photocatalysis, and in gas sensitive field, zinc oxide is three big gas sensitives
One of, it is widely used in the air-sensitive detection of ethyl alcohol etc., and there are no zinc oxide and graphene are combined as room in the prior art
The lower NO of temperature2The technical solution of gas sensor sensitive material.In technical solution of the present invention, by by Zinc oxide nano sheet and graphite
Alkene combines, and regulates and controls the semiconducting behavior of graphene, produces unexpected technique effect, improves the sensitivities of sensitive material
Energy.
It is further preferred that the Au/SnO2/ RGO composite materials are prepared by hydro-thermal method, which is in two
Tie up laminated structure, Au and SnO2It is nano-particle, is uniformly supported on graphene surface；The Au nano particle diameters are
10nm；The SnO2Nano particle diameter is 5nm；In the composite material, Au, SnO2Mass ratio with RGO is 7:5:4.It is described
In composite material, by adulterating Au and SnO in graphene surface2Nano-particle improves the electron transfer rate of sensitive material,
So that composite material has porous structure, meanwhile, the SnO of N-shaped2P-n junction is formed between nano-particle and the graphene of p-type, from
And improve sensitivity characteristic.
NO of the present invention2The preparation process of sensor is：
S1 prepares ZnO nano piece：The urea of 3.5g and the zinc acetate of 1g are taken respectively, and urea and zinc acetate are dissolved in
40ml is gone in example water, is formed mixed solution, is then stirred 50min, mixed solution is transferred to the conical flask of 100ml after stirring
In, conical flask is placed in baking oven, 8h is kept the temperature at 95 DEG C, then natural cooling by sealing, by precipitation centrifugation, washing, then 60
DEG C dry 3h, finally, will be deposited in 320 DEG C of calcining 2h in Muffle furnace, obtains the ZnO nano piece powder；
S2 prepares Au/SnO2/ RGO composite materials
A) graphite oxide is prepared：The preparation of GO is completed by improved Hummers methods, first, by the graphite of 0.1g
Powder is mixed with the concentrated sulfuric acid solution of 2.3ml, is stirred at room temperature for 24 hours, then, the sodium nitrate of 10mg is added to mixture relaying
Continuous stirring 40min, then, mixture is placed in ice bath, is slowly added to 0.3g potassium permanganate thereto, and object stirring to be mixed is equal
After even, 35-40 DEG C of heating water bath processing 40min is carried out to it, until reacting sticky, is slow added into 4.6ml distilled water, and will
Said mixture heating stirring 15min at 75 DEG C finally, 14ml distilled water and the hydrogen peroxide of 1ml is added in into mixture
Solution reacts to terminate；Then, gained mixture with distilled water is cleaned repeatedly, until solution is in neutrality, then solution will be deposited on
The graphite powder of the not oxidized stripping in bottom and the GO piece layer separations by oxidation stripping dispersion in aqueous solution, by dried GO
Again it is dispersed in the GO solution that a concentration of 1.0mg/ml is configured in example water；
B) Au/SnO is prepared2/ RGO composite materials：The above-mentioned GO solution of 1ml is added in 40ml distilled water, then will
SnCl4·5H2O is added in the dispersion liquid of GO, ultrasonic disperse 30min, and solution is then transferred to the hydrothermal reaction kettle of 50ml
In, 180 DEG C of reaction 12h in an oven are put after sealing, products therefrom is centrifuged, obtains In2O3/ RGO dispersion liquids；Again by Au
Nano-particle is added to above-mentioned In2O3In/RGO dispersion liquids, mixed solution is heated to 100 DEG C of reaction 60min, products therefrom warp
It centrifuges, washing, obtains the Au/SnO2/ RGO composite material dispersion liquids；
S3：By Au/SnO obtained above2/ RGO composite material dispersant liquid drops are coated onto ZnO nano piece powder surface, grinding
60min, be ultrasonically treated 20min, be uniformly mixed it, then, mixture is subjected to the processing of low temperature radio frequency argon plasma, wait from
Sub- generating means is inductive coupling, and working frequency 15.24MHz, power 350W, air pressure 45Pa, gas flow rate is
22sccm, processing time 40min；
In technical solution of the present invention, by Au/SnO2/ RGO composite material dispersant liquid drops are coated onto ZnO nano piece powder surface,
The graphene sheet layer can be effectively adsorbed on Zinc oxide nano sheet surface, further increase specific surface area, in addition, mixture passes through
Argon plasma processing is crossed, the surface nature of composite material can be effectively improved, increase surface-active, for improving NO2It is sensitive
Degree, reduction minimal detectable concentration produce unexpected technique effect.
S4：By the mixture after corona treatment with example water is gone to be uniformly mixed in right amount, 10min is ground in mortar,
Gained paste is coated on the ceramic bases surface for inserting finger electrode, after dry, obtains the NO2Sensor；
Specifically, the slotting finger electrode is Au electrodes, Au electrode lines width is 0.1mm, refers to spacing as 0.15mm, inserts and refer to
Thickness of electrode is 0.1~0.2mm.
Embodiment
In the present embodiment, the NO2Sensor is thick-film type, and ceramic substrate is used to be set on the ceramic substrate for substrate
Have to insert and refer to electrode, insert and refer to electrode equipped with sensitive thin film, which is 0.15mm, and the sensitive thin film is received for ZnO
Rice piece and Au/SnO2The mixture of/RGO composite materials；The ZnO nano piece and Au/SnO2The mass ratio of/RGO composite materials is 4:
1。
The ZnO nano piece is prepared by hydro-thermal method.
The Au/SnO2/ RGO composite materials are prepared by hydro-thermal method, and the composite material is in two-dimensional sheet structure, Au
And SnO2It is nano-particle, is uniformly supported on graphene surface；The Au nano particle diameters are 10nm；The SnO2It receives
Rice corpuscles grain size is 5nm；In the composite material, Au, SnO2Mass ratio with RGO is 7:5:4.
NO described in the present embodiment2The preparation process of sensor is：
S1 prepares ZnO nano piece：The urea of 3.5g and the zinc acetate of 1g are taken respectively, and urea and zinc acetate are dissolved in
40ml is gone in example water, is formed mixed solution, is then stirred 50min, mixed solution is transferred to the conical flask of 100ml after stirring
In, conical flask is placed in baking oven, 8h is kept the temperature at 95 DEG C, then natural cooling by sealing, by precipitation centrifugation, washing, then 60
DEG C dry 3h, finally, will be deposited in 320 DEG C of calcining 2h in Muffle furnace, obtains the ZnO nano piece powder；
S2 prepares Au/SnO2/ RGO composite materials
A) graphite oxide is prepared：The preparation of GO is completed by improved Hummers methods, first, by the graphite of 0.1g
Powder is mixed with the concentrated sulfuric acid solution of 2.3ml, is stirred at room temperature for 24 hours, then, the sodium nitrate of 10mg is added to mixture relaying
Continuous stirring 40min, then, mixture is placed in ice bath, is slowly added to 0.3g potassium permanganate thereto, and object stirring to be mixed is equal
After even, 35-40 DEG C of heating water bath processing 40min is carried out to it, until reacting sticky, is slow added into 4.6ml distilled water, and will
Said mixture heating stirring 15min at 75 DEG C finally, 14ml distilled water and the hydrogen peroxide of 1ml is added in into mixture
Solution reacts to terminate；Then, gained mixture with distilled water is cleaned repeatedly, until solution is in neutrality, then solution will be deposited on
The graphite powder of the not oxidized stripping in bottom and the GO piece layer separations by oxidation stripping dispersion in aqueous solution, by dried GO
Again it is dispersed in the GO solution that a concentration of 1.0mg/ml is configured in example water；
B) Au/SnO is prepared2/ RGO composite materials：The above-mentioned GO solution of 1ml is added in 40ml distilled water, then will
SnCl4·5H2O is added in the dispersion liquid of GO, ultrasonic disperse 30min, and solution is then transferred to the hydrothermal reaction kettle of 50ml
In, 180 DEG C of reaction 12h in an oven are put after sealing, products therefrom is centrifuged, obtains In2O3/ RGO dispersion liquids；Again by Au
Nano-particle is added to above-mentioned In2O3In/RGO dispersion liquids, mixed solution is heated to 100 DEG C of reaction 60min, products therefrom warp
It centrifuges, washing, obtains the Au/SnO2/ RGO composite material dispersion liquids；
S3：By Au/SnO obtained above2/ RGO composite material dispersant liquid drops are coated onto ZnO nano piece powder surface, grinding
60min, be ultrasonically treated 20min, be uniformly mixed it, then, mixture is subjected to the processing of low temperature radio frequency argon plasma, wait from
Sub- generating means is inductive coupling, and working frequency 15.24MHz, power 350W, air pressure 45Pa, gas flow rate is
22sccm, processing time 40min；
In technical solution of the present invention, by Au/SnO2/ RGO composite material dispersant liquid drops are coated onto ZnO nano piece powder surface,
The graphene sheet layer can be effectively adsorbed on Zinc oxide nano sheet surface, further increase specific surface area, in addition, mixture passes through
Argon plasma processing is crossed, the surface nature of composite material can be effectively improved, increase surface-active, for improving NO2It is sensitive
Degree, reduction minimal detectable concentration produce unexpected technique effect.
S4：By the mixture after corona treatment with example water is gone to be uniformly mixed in right amount, 10min is ground in mortar,
Gained paste is coated on the ceramic bases surface for inserting finger electrode, after dry, obtains the NO2Sensor；
Specifically, the slotting finger electrode is Au electrodes, Au electrode lines width is 0.1mm, refers to spacing as 0.15mm, inserts and refer to
Thickness of electrode is 0.1~0.2mm.
Reference examples 1
Compared to above-described embodiment, ZnO nano piece is not provided in the sensitive thin film.
Reference examples 2
Compared to above-described embodiment, the Au/SnO of the sensitive thin film2Au nano-particles are not provided with in/RGO composite materials.
Reference examples 3
Compared to above-described embodiment, the Au/SnO of the sensitive thin film2SnO is not provided with in/RGO composite materials2Nanoparticle
Son.
Reference examples 4
Compared to above-described embodiment, the sensitive thin film does not pass through plasma treatment.
Using gas-sensitive property tester to NO of the present invention2Sensor is tested：First certain density object gas is noted
Enter into sealing test chamber, treat air in object gas and chamber after mixing, then by NO2Sensor is put into test chamber.
NO in the present invention2Sensitivity, response recovery time of sensor etc. use this field usual definition.
First, the sensor obtained respectively to embodiment and reference examples is at room temperature to the NO of 5ppm2Carry out response test,
Test result is as follows table：
It can be seen that the sensor that embodiment obtains is respectively provided with clear superiority in sensitivity, response recovery time, produces
Unexpected technique effect.Then, by NO obtained by embodiment2Sensor is to the NO of 1ppm2Response test is carried out, is found sensitive
Degree is still up to 23.1, reduces NO2Minimal detectable concentration.
The foregoing is merely the preferred modes of the present invention, are not intended to limit the invention, all spirit and original in the present invention
Within then, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (8)
1. the highly sensitive environmental quality monitoring system based on graphene, which is characterized in that the environmental quality monitoring system includes
Base station and the atmosphere pollution monitor being connected respectively with base station and meteorological monitor；
The base station includes computer, data pre-processor and ups power, and computer is connected with data pre-processor, UPS electricity
Source is connected respectively with computer and data pre-processor；
The atmosphere pollution monitor includes microprocessor and function sensor group coupled respectively, power supply mould
Block and communication module, function sensor group include sensor interface and PM10 sensors coupled respectively, PM2.5
Sensor, SO2Sensor, NO2Sensor, O3Sensor, CO sensors, temperature sensor and humidity sensor；
The weather monitoring instrument includes function sensor group and data collector, and data collector passes through data pre-processor and meter
Calculation machine is connected, function sensor group include be connected respectively with data collector wind transducer, air velocity transducer and
The baroceptor being connected with data pre-processor；
The NO2Sensor is thick-film type, uses ceramic substrate as substrate, is equipped on the ceramic substrate and inserts finger electrode, inserted and refer to electricity
Sensitive thin film is extremely equipped with, the sensitive thin film is ZnO nano piece and Au/SnO2The mixture of/RGO composite materials.
2. the highly sensitive environmental quality monitoring system according to claim 1 based on graphene, which is characterized in that the electricity
Source module is connected with municipal administration power supply or solar panels.
3. the highly sensitive environmental quality monitoring system according to claim 1 based on graphene, which is characterized in that described logical
News module is connected with the computer.
4. the highly sensitive environmental quality monitoring system according to claim 1 based on graphene, which is characterized in that described
ZnO nano piece is prepared by hydro-thermal method；The Au/SnO2/ RGO composite materials are prepared by hydro-thermal method, this is compound
Material is in two-dimensional sheet structure, Au and SnO2It is nano-particle, is uniformly supported on graphene surface.
5. the highly sensitive environmental quality monitoring system according to claim 4 based on graphene, which is characterized in that Au/
SnO2In/RGO composite materials, the Au nano particle diameters are 10nm；The SnO2Nano particle diameter is 5nm；The composite wood
In material, Au, SnO2Mass ratio with RGO is 7:5:4.
6. the highly sensitive environmental quality monitoring system according to claim 5 based on graphene, which is characterized in that described quick
Sense film thickness is 0.15mm.
7. the highly sensitive environmental quality monitoring system according to claim 5 based on graphene, which is characterized in that described
ZnO nano piece and Au/SnO2The mass ratio of/RGO composite materials is 4:1.
8. the highly sensitive environmental quality monitoring system according to claim 5 based on graphene, which is characterized in that the NO2
The preparation process of sensor is：
S1 prepares ZnO nano piece：The urea of 3.5g and the zinc acetate of 1g are taken respectively, and urea and zinc acetate are dissolved in 40ml
In example water, mixed solution is formed, 50min is then stirred, mixed solution is transferred in the conical flask of 100ml after stirring, it is close
Envelope, conical flask is placed in baking oven, 8h is kept the temperature at 95 DEG C, then natural cooling, dry by precipitation centrifugation, washing, then at 60 DEG C
Dry 3h finally, will be deposited in 320 DEG C of calcining 2h in Muffle furnace, obtain the ZnO nano piece powder；
S2 prepares Au/SnO2/ RGO composite materials
A) graphite oxide is prepared：The preparation of GO is completed by improved Hummers methods；
B) Au/SnO is prepared2/ RGO composite materials：The above-mentioned GO solution of 1ml is added in 40ml distilled water, then by SnCl4·
5H2O is added in the dispersion liquid of GO, and solution is then transferred in the hydrothermal reaction kettle of 50ml by ultrasonic disperse 30min, sealing
After put in an oven 180 DEG C reaction 12h, products therefrom is centrifuged, obtains In2O3/ RGO dispersion liquids；Again by Au nano-particles
It is added to above-mentioned In2O3In/RGO dispersion liquids, mixed solution is heated to 100 DEG C of reaction 60min, products therefrom is centrifuged,
Washing, obtains the Au/SnO2/ RGO composite material dispersion liquids；
S3：By Au/SnO obtained above2/ RGO composite material dispersant liquid drops are coated onto ZnO nano piece powder surface, grinding 60min,
20min is ultrasonically treated, is uniformly mixed it, then, mixture is subjected to the processing of low temperature radio frequency argon plasma, plasma occurs
Device is inductive coupling, and working frequency 15.24MHz, power 350W, air pressure 45Pa, gas flow rate 22sccm are handled
Time is 40min；
S4：By the mixture after corona treatment with example water being gone to be uniformly mixed in right amount, 10min is ground in mortar, by institute
It obtains paste to be coated on the ceramic bases surface for inserting finger electrode, after drying, obtains the NO2Sensor；The slotting finger
Electrode is Au electrodes, and Au electrode lines width is 0.1mm, refers to spacing as 0.15mm, and it is 0.1~0.2mm to insert finger thickness of electrode.
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Application publication date: 20180706 |