CN108398155A - A kind of highly sensitive environmental quality monitoring system - Google Patents
A kind of highly sensitive environmental quality monitoring system Download PDFInfo
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- CN108398155A CN108398155A CN201810129116.3A CN201810129116A CN108398155A CN 108398155 A CN108398155 A CN 108398155A CN 201810129116 A CN201810129116 A CN 201810129116A CN 108398155 A CN108398155 A CN 108398155A
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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
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Abstract
The present invention relates to a kind of highly sensitive environmental quality monitoring system, including base station and its distinguish coupled atmosphere pollution monitor 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 for 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 TiO2Nano-particle and Ca/SnO2The mixture of/N RGO composite materials.
Description
Technical field
The present invention relates to environmental quality monitoring field more particularly to a kind of highly sensitive environmental quality monitoring systems.
Background technology
Currently, in existing environmental monitoring system, it can not also be by the same base station simultaneously to atmosphere pollution quality
It is monitored with meteorology, and detection sensitivity is relatively low.
Invention content
The present invention is intended to provide a kind of highly sensitive environmental quality monitoring system, set forth above to solve the problems, such as.
A kind of highly sensitive environmental quality monitoring system, including base station and its difference are provided in the embodiment of the present invention
Coupled atmosphere pollution monitor and meteorological monitor；
The base station includes computer, data pre-processor and ups power, the computer and the data pre-processor
It is connected, the ups power is connected with the computer and the data pre-processor respectively；
The atmosphere pollution monitor includes microprocessor and function sensor group coupled respectively, electricity
Source 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；
The weather monitoring instrument includes function sensor group and data collector, and data collector passes through data pre-processor
Be connected with computer, function sensor group include the wind transducer being connected respectively with data collector, air velocity transducer,
And the baroceptor being connected with data pre-processor；
The NO2Sensor is thick-film type, uses ceramic substrate for substrate, is equipped on the ceramic substrate and inserts finger electricity
Pole inserts and refers to electrode equipped with sensitive thin film, and the sensitive thin film is TiO2Nano-particle and Ca/SnO2/ N-RGO composite materials
Mixture.
Preferably, in sensitive thin film, graphene is prepared first, then by adding urea, SnCl4·5H2O、Ca
(NO3)2, Ca/SnO is made2/ N-RGO composite material dispersion liquids, then by Ca/SnO2/ N-RGO composite material dispersant liquid drops are coated onto
TiO2Nanoparticle surface, and by the processing of plasma, to form the sensor sensing film；The TiO2
Nano-particle and Ca/SnO2The mass ratio of/N-RGO composite materials is 7:1.
The technical solution that the embodiment of the present invention provides can include the following benefits：
Environmental quality monitoring system disclosed by the invention can be by the 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.
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
Obviously, or practice through the invention is recognized.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 constitute 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 implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.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.
In conjunction with Fig. 1-Fig. 3, the embodiment of the present invention is related to a kind of highly sensitive environmental quality monitoring system, including base station, with
And its atmosphere pollution monitor and meteorology monitor that difference is coupled.
Base station includes computer, data pre-processor and ups power, and computer is connected with data pre-processor, UPS electricity
Source is connected with computer and data pre-processor respectively.
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.
Wherein, battery module is connected with municipal administration power supply or solar panels.
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 the wind transducer being connected respectively with data collector, air velocity transducer and
The baroceptor being connected with data pre-processor.
Wherein, NO2Sensor is to be directed to NO2The tool that gas is detected, wherein sensitive material are core component, currently,
For NO2Detection, sensitive material is concentrated mainly on the materials such as metal-oxide semiconductor (MOS), and above-mentioned material needs at high temperature
With NO2Detectability, this gives NO2The marketization and miniaturization, intelligence are made troubles.
A kind of embodiment is NO of the present invention2Sensor is thick-film type, uses ceramic substrate for substrate,
The ceramic substrate, which is equipped with to insert, refers to electrode, inserts finger electrode and is equipped with sensitive thin film, the sensitive thin film is TiO2Nano-particle and
Ca/SnO2The mixture of/N-RGO composite materials.
NO disclosed by the invention2Sensor is based on TiO2Nano-particle and Ca/SnO2/ N-RGO composite materials, the sensor
It is operated in room temperature, there is good sensitivity and faster response recovery time, is NO2The application of sensor provides more multiselect
It selects.
Preferably, which is 0.1mm.
As described above, the NO based on INVENTIONConventional metal-oxide2Sensor needs to work at a higher temperature, increases biography
Sensor in-fighting.And graphene is a kind of novel carbon material, since its special atomic structure and complicated band structure make it
There is characteristic of semiconductor and metallic character simultaneously, and there is excellent electron transmission performance, many researchs are attempted graphene material
Material is applied to construct room temperature air sensor, wherein modified metal oxide grapheme material is widely used in room temperature detection
NO2, but its that there are still sensitivity is low, response restores the problems such as slow.
Based on above-mentioned background, in technical solution of the present invention, the sensitive thin film is TiO2Nano-particle and Ca/SnO2/N-
The mixture of RGO composite materials, and the mixture have passed through corona treatment, on the basis of the two combines so that institute
It states sensitive thin film and produces unexpected technique effect, at room temperature so that the sensitive performance of sensor greatly improves.
Specifically, in the above-mentioned sensitive thin film of the present invention, graphene is prepared first, then by adding urea, SnCl4·
5H2O、Ca(NO3)2, Ca/SnO is made2/ N-RGO composite material dispersion liquids, then by Ca/SnO2/ N-RGO composite material dispersion liquids
Drop coating is to TiO2Nanoparticle surface, and by the processing of plasma, to form the sensor sensing film；Institute
The Ca/SnO stated2In/N-RGO composite materials, RGO is in lamella, doped with nitrogen-atoms, Ca and SnO2For nano-particle, modification is being mixed
The surfaces lamella RGO of miscellaneous nitrogen；By Ca/SnO2/ N-RGO dispersant liquid drops are coated onto TiO2Nanoparticle surface can make the Ca/
SnO2/ N-RGO composite materials are well dispersed in TiO2Nanoparticle surface reaches pair by the high-specific surface area of nano-particle
Ca/SnO2The technical purpose of/N-RGO composite materials dispersion, produces unexpected technique effect, it is sensitive to improve sensor
Degree；In addition, the redox graphene (RGO) and TiO of N doping2Nano-particle, SnO2Nano-particle, Ca nano-particles combine,
Above-mentioned nano-particle adulterates graphene, can regulate and control the surface properties and semiconductor properties of graphene, and then improve sensor
Sensitivity characteristic, above-mentioned combination is to NO2Sensitization is played, the transmission rate of electronics in sensitive material is improved, produces meaning
Technique effect unexpectedly.
In terms of mass ratio, the TiO2Nano-particle and Ca/SnO2The mass ratio of/N-RGO composite materials is 7:1.Pass through
Regulate and control mixture mass ratio so that the sensitive material produces unexpected technique effect so that sensor it is sensitive
Performance greatly improves.
Specifically, the TiO2The grain size of nano-particle is 100nm.
Specifically, the Ca/SnO2/ N-RGO composite materials are prepared by hydro-thermal method, which is in two-dimensional slice
Shape structure, Ca and SnO2It is nano-particle, uniformly supports on the surface of graphene, graphene is doped with nitrogen；The Ca
Nano particle diameter is 20nm, the SnO2Nano particle diameter is 5nm；In the composite material, Ca, SnO2, N, RGO quality
Ratio is 27:20:2:40.
In the composite material, by adulterating nitrogen-atoms and Ca, SnO to graphene2Nano-particle improves sensitive material
Electron transfer rate so that composite material have porous structure improve sensitivity characteristic in turn.
NO of the present invention2The preparation process of sensor is：
Step 1, Ca/SnO is prepared2/ N-RGO composite materials
A) graphene oxide is prepared
The preparation of GO is completed by improved Hummers methods：First, by the dense sulphur of the graphite powder of 0.1g and 2.3ml
Acid solution mixes, and is stirred at room temperature for 24 hours, then, the sodium nitrate of 10mg is added in mixture and continues to stir 40min, so
Afterwards, mixture is placed in ice bath, is slowly added to 0.3g potassium permanganate thereto, after object to be mixed stirs evenly, it is carried out
35-40 DEG C of heating water bath processing 40min is slow added into 4.6ml distilled water, and said mixture is existed until reacting sticky
Heating stirring 15min at 75 DEG C, finally, it is anti-to terminate that the hydrogenperoxide steam generator of 14ml distilled water and 1ml are added into mixture
It answers；Then, repeatedly wash with distilled water by gained mixture, until solution is in neutrality, then will to be deposited on solution bottom not oxidized
The graphite powder of stripping and the GO piece layer separations by oxidation stripping dispersion in aqueous solution, the GO after drying is dispersed in again
The GO solution of a concentration of 1.0mg/ml is configured in example water；
B) Ca/SnO is prepared2/ N-RGO composite material dispersion liquids
The above-mentioned GO solution for taking 1ml, adds it in 40ml distilled water, then by SnCl4·5H2O and urea are added to GO
In dispersion liquid, solution is then transferred in hydrothermal reaction kettle by ultrasonic disperse 30min, and 180 DEG C of reactions in an oven are put after sealing
12h centrifuges products therefrom, obtains SnO2/ N-RGO dispersion liquids；
Again by the Ca (NO of 0.3M3)2The sodium acetate solution that solution and mass fraction are 2% is added to above-mentioned SnO2/N-RGO
In dispersion liquid, mixed solution is heated to 100 DEG C of reaction 60min, products therefrom is centrifuged, washs, and obtains the Ca/
SnO2/ N-RGO composite material dispersion liquids；
Step 2, it mixes
It is the TiO of 100nm to take grain size2Nano-particle, by above-mentioned Ca/SnO2/ N-RGO composite material dispersant liquid drops are coated onto
TiO2Grinding 30min, nanoparticle surface is ultrasonically treated 15min, so that it is uniformly mixed, obtain mixture A；
Step 3, corona treatment
Mixture A is subjected to the processing of low temperature radio frequency argon plasma, plasma generator is inductive coupling, work frequency
Rate is 13.75MHz, power 350W, air pressure 30Pa, gas flow rate 15sccm, processing time 60min；
In technical solution of the present invention, mixture is handled by argon plasma, can be effectively improved the surface of composite material
Property increases surface-active, for improving NO2Sensitivity, reduction minimal detectable concentration produce unexpected technique effect.
Step 4, NO is prepared2Sensor
By step 3 plasma treated mixture A with go example water to be uniformly mixed in right amount, ground in mortar
Gained paste is coated on the ceramic bases surface for inserting finger electrode, after dry, obtains the NO by 10min2Sensor；
Specifically, the slotting finger electrode is Pt electrodes, Pt electrode line width is 0.12mm, and it is 0.15mm to refer to spacing, is inserted
Finger thickness of electrode is 0.1~0.2mm.
Reference examples 1
Compared to above-described embodiment, TiO is not provided in the sensitive thin film2Nano-particle.
Reference examples 2
Compared to above-described embodiment, the Ca/SnO of the sensitive thin film2It is not provided with Ca nanoparticles in/N-RGO composite materials
Son.
Reference examples 3
Compared to above-described embodiment, the Ca/SnO of the sensitive thin film2It is not provided with SnO in/N-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, wait for 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 5ppm2Response test is carried out,
Test result is as follows table 1：
It can be seen that the NO that embodiment obtains2Sensor all has clear superiority in sensitivity, response recovery time, production
Unexpected technique effect is given birth to.Then, by NO obtained by embodiment2NO of the sensor to 1ppm2Response test is carried out, is found
Sensitivity is still up to 21.8, reduces NO2Minimal detectable concentration.
Further, by above-mentioned NO2Sensor application may be implemented at room temperature in the atmosphere pollution monitor
To NO2Highly sensitive response, contribute to the raising of environmental quality monitoring system sensitivity.
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 (10)
1. a kind of highly sensitive environmental quality monitoring system, which is characterized in that including base station and its distinguish it is coupled big
Gas pollutant monitoring instrument and meteorological monitor；
The base station includes computer, data pre-processor and ups power, and the computer is connected with the data pre-processor
It connects, the ups power is connected with the computer and the data pre-processor respectively；
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 the wind transducer being connected respectively with data collector, air velocity transducer and
The baroceptor being connected with data pre-processor；
The NO2Sensor is thick-film type, uses ceramic substrate for substrate, is equipped on the ceramic substrate and inserts finger electrode, inserted and refer to
Electrode is equipped with sensitive thin film, and the sensitive thin film is TiO2Nano-particle and Ca/SnO2The mixture of/N-RGO composite materials.
2. environmental quality monitoring system according to claim 1, which is characterized in that in sensitive thin film, prepare graphite first
Alkene, then by adding urea, SnCl4·5H2O、Ca(NO3)2, Ca/SnO is made2Then/N-RGO composite material dispersion liquids will
Ca/SnO2/ N-RGO composite material dispersant liquid drops are coated onto TiO2Nanoparticle surface, and by the processing of plasma, thus
Form the sensor sensing film；The TiO2Nano-particle and Ca/SnO2The mass ratio of/N-RGO composite materials is 7:1.
3. environmental quality monitoring system according to claim 2, which is characterized in that the TiO2The grain size of nano-particle is
100nm。
4. environmental quality monitoring system according to claim 2, which is characterized in that the Ca/SnO2/ N-RGO composite materials
It is to be prepared by hydro-thermal method, which is in two-dimensional sheet structure, Ca and SnO2It is nano-particle, is uniformly supported on
Graphene surface, graphene is doped with nitrogen.
5. environmental quality monitoring system according to claim 4, which is characterized in that the Ca nano particle diameters are
20nm, the SnO2Nano particle diameter is 5nm；In the composite material, Ca, SnO2, N, RGO mass ratio be 27:20:
2:40。
6. environmental quality monitoring system according to claim 2, which is characterized in that the NO2The preparation process of sensor
For：
Step 1, Ca/SnO is prepared2/ N-RGO composite materials
A) graphene oxide is prepared
The preparation of GO is completed by improved Hummers methods：First, the concentrated sulfuric acid of the graphite powder of 0.1g and 2.3ml is molten
Liquid mixes, and is stirred at room temperature for 24 hours, then, the sodium nitrate of 10mg is added in mixture and continues to stir 40min, then, will
Mixture is placed in ice bath, is slowly added to 0.3g potassium permanganate thereto, and after object to be mixed stirs evenly, 35-40 is carried out to it
DEG C heating water bath processing 40min be slow added into 4.6ml distilled water, and by said mixture at 75 DEG C until reacting sticky
The hydrogenperoxide steam generator of 14ml distilled water and 1ml are finally added into mixture to terminate reaction by heating stirring 15min；So
Afterwards, repeatedly wash with distilled water by gained mixture, until solution is in neutrality, then the not oxidized stripping in solution bottom will be deposited on
Graphite powder and the GO piece layer separations by oxidation stripping dispersion in aqueous solution, example water is dispersed in by the GO after drying again
In be configured to the GO solution of a concentration of 1.0mg/ml；
B) Ca/SnO is prepared2/ N-RGO composite material dispersion liquids
The above-mentioned GO solution for taking 1ml, adds it in 40ml distilled water, then by SnCl4·5H2O and urea are added to GO dispersions
In liquid, solution is then transferred in hydrothermal reaction kettle by ultrasonic disperse 30min, and 180 DEG C of reaction 12h in an oven are put after sealing,
Products therefrom is centrifuged, SnO is obtained2/ N-RGO dispersion liquids；
Again by the Ca (NO of 0.3M3)2The sodium acetate solution that solution and mass fraction are 2% is added to above-mentioned SnO2/ N-RGO disperses
In liquid, mixed solution is heated to 100 DEG C of reaction 60min, products therefrom is centrifuged, washs, and obtains the Ca/SnO2/
N-RGO composite material dispersion liquids；
Step 2, it mixes
It is the TiO of 100nm to take grain size2Nano-particle, by above-mentioned Ca/SnO2/ N-RGO composite material dispersant liquid drops are coated onto TiO2It receives
Grinding 30min, rice corpuscles surface is ultrasonically treated 15min, so that it is uniformly mixed, obtain mixture A；
Step 3, corona treatment
Mixture A is subjected to the processing of low temperature radio frequency argon plasma, plasma generator is inductive coupling, and working frequency is
13.75MHz, power 350W, air pressure 30Pa, gas flow rate 15sccm, processing time 60min；
Step 4, NO is prepared2Sensor
By step 3 plasma treated mixture A with go example water 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.
7. environmental quality monitoring system according to claim 1, which is characterized in that the slotting finger electrode is Pt electrodes,
Pt electrode line width is 0.12mm, and it is 0.15mm to refer to spacing, inserts and refers to thickness of electrode as 0.1~0.2mm.
8. environmental quality monitoring system according to claim 1, which is characterized in that the sensitive thin film thickness is 0.1mm.
9. environmental quality monitoring system according to claim 1, which is characterized in that the battery module with municipal administration power supply or
Solar panels are connected.
10. environmental quality monitoring system according to claim 1, which is characterized in that the communication module and computer phase
Connection.
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Application publication date: 20180814 |