CN208270473U - A kind of room temperature alcohol gas sensor - Google Patents
A kind of room temperature alcohol gas sensor Download PDFInfo
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- CN208270473U CN208270473U CN201820757131.8U CN201820757131U CN208270473U CN 208270473 U CN208270473 U CN 208270473U CN 201820757131 U CN201820757131 U CN 201820757131U CN 208270473 U CN208270473 U CN 208270473U
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- gas sensor
- room temperature
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Abstract
The utility model discloses a kind of room temperature alcohol gas sensors, belong to flexible electrical resistance type gas sensor technical field, it include: to be formed by substrate, the parallel electrode in substrate and coated in the sensitive material among parallel pole, wherein, the sensitive material is multi-walled carbon nanotube/polyaniline composite material.The situ detection system includes the room temperature alcohol gas sensor, signal filter, single-chip microcontroller, bluetooth and cell phone client of power supply, the utility model.The preparation method for the sensitive material that the utility model uses is simple and environmentally-friendly and at low cost, and preparation process carries out at low temperature；The device can carry out room temperature monitoring to gaseous state concentration of alcohol, high to the response sensitivity of ethyl alcohol, room temperature fast response time.The situ detection system of the gas sensor can be made wrist-watch bracelet and be worn in wrist, signal data can in cell phone client real-time display, for personal drunk driving real-time detection provide convenience.
Description
Technical field
The utility model belongs to flexible electrical resistance type gas sensor technical field, and in particular to a kind of alcohol gas sensing
Device.
Background technique
With industrialized rapid development, the mankind produce different types of gas in production and living, wherein being no lack of one
A little poisonous and hazardous gases.Ethyl alcohol is as a kind of important organic solvent, in industry, the conjunction of medicine, paper handkerchief, perfume and cosmetics
At etc. be widely used.Meanwhile ethyl alcohol is also the main component of food and drug, all the time, excessive drinking causes
The accident of threat to life safety is commonplace.Therefore, it is very significant for developing a kind of portable ethanol sensor.Base
It can arbitrarily move, be bent, compress in flexible gas sensor technology and keep good sensing capabilities, can work out or be assembled in clothing
On object, ancillary equipment or daily necessities, the information of such gas concentration can obtain uninterrupted, whenever and wherever possible, make people
The content of internal alcohol can be understood in time after drinking by breathing out to wearable alcohol gas sensor, pre- drunk-driving prevention,
The generation for reducing safety accident, provides reliable guarantee for safe driving.
However, there are two disadvantages for existing alcohol gas sensor: 1, existing sensor is mostly based on silicon wafer, ceramic lamp
Etc. rigid basements, this kind of sensor it is generally existing not bent, bulky the disadvantages of, seriously hinder gas sensor can
Wearingization progress；2, the material of alcohol gas sensor is all based on metal oxide, such as stannic oxide mostly.Although metal oxygen
Compound is higher to the sensitivity of ethyl alcohol, but needs to work normally under the high temperature conditions, this makes sensor also need one
A heating device assists it to realize monitoring function.Heating device both can make the volume of sensing unit become larger, and quality becomes weight, Er Qiegao
Warm device is not suitable as wearable equipment directly and human contact.
In addition, as an independent wearable ethyl alcohol detection system, in addition to needing sensing unit, it is also necessary to signal acquisition
Processing and display unit.In order to realize wearable integrated gas sensing and display function, the circuit board of signal acquisition unit
It is also required to the feature for having small in size, flexible.It can acquisition process and the variation of transmission sensor both ends current signal but existing
Board quality it is heavier, volume is also larger, it is difficult to meet the needs of wearable device.
For this reason, it may be necessary to which utility model goes out and a kind of had both had that flexibility, high sensitivity, fast response time, the spies such as have good stability
Property, while capableing of wearable gas at normal temperature sensor and the in situ detection system of the real-time continuous unknown ethanol gas concentration of output again
System.
Utility model content
The utility model is in view of the above-mentioned problems, provide a kind of high sensitivity, the flexible normal temperature resistance type of fast response time
Application in ethanol sensor and its in situ detection system carries out real-time monitoring to gas concentration with cell phone client.The device
Part is the sensitive layer of sensor using a kind of multi-walled carbon nanotube/polyaniline composite material, passes through the variation for perceiving concentration of alcohol
The variation of self-resistance is shown as, and then is detected for drunk driving.
The utility model is achieved through the following technical solutions:
A kind of room temperature alcohol gas sensor, comprising: by substrate, 2 parallel electrodes in substrate and coated in 2
Sensitive material composition among a parallel pole, wherein the sensitive material is multi-walled carbon nanotube/polyaniline composite wood
Material.
Further, the multi-walled carbon nanotube/polyaniline composite material, is prepared via a method which to obtain, specifically
Steps are as follows:
Firstly, multi-walled carbon nanotube and aniline monomer are added in 1M/L in perchloric acid solution according to the mass ratio of 1:2,
It is stirred 30 minutes at 0 DEG C；Then, density is added dropwise with volume ratio 3:1 into above-mentioned solution is 6*10-3The ammonium persulfate of kg/L is molten
Liquid stirs mixed solution 24 hours under the conditions of 0 DEG C, and the polyaniline nano-rod array after polymerization is equably grown in carbon nanometer
Guan Shang；Finally, the multi-walled carbon nanotube polyaniline nano-composite material that will be obtained, is washed with deionized water, methanol and ethyl alcohol respectively
It washs, the nano material after washing is dried in vacuo 24 hours at 60 DEG C.
Further, the volume ratio of the mixed liquor and perchloric acid solution of the multi-walled carbon nanotube and aniline monomer is 1:
5。
Further, the coating thickness of the sensitive material is 200nm-300nm.
Further, the electrode is rectangular gold electrode.
Further, the substrate is PET base.
A kind of application in detection system in situ of alcohol gas sensor, the situ detection system include power supply,
The room temperature alcohol gas sensor, signal filter, single-chip microcontroller, bluetooth and cell phone client of the utility model；Power supply is sensing
Device power supply, acquires the current signal on room temperature alcohol gas sensor both sides, then current signal is transferred to by signal filter
Single-chip microcontroller, signal upload to cell phone client through bluetooth after single-chip microcontroller is handled.
The situ detection system device of the alcohol gas sensor can be encapsulated in watchband, be worn on the hand of tested people
It exhales at wrist, by cell phone software, the concentration of Ethanol in Gas can be accurately obtained in mobile phone and whether reaches peace
The standard driven entirely, according to the concentration of alcohol show value of cell phone client can judge driver whether drunk driving.
Compared with prior art, as follows the advantages of the utility model:
1, the preparation method for the sensitive material that the utility model uses is simple and environmentally-friendly and at low cost, and whole preparation process is equal
It carries out at low temperature；
2, the gas sensor of the utility model can carry out room temperature monitoring to gaseous state concentration of alcohol；
3, the gas sensor of the utility model is high to the response sensitivity of ethyl alcohol, and room temperature fast response time, device is stablized
Property is good；
4, the gas sensor substrate of the utility model is flexible, and the comfort of wearable device can be improved；
5, the situ detection system of the gas sensor of the utility model can be made wrist-watch bracelet and be worn in wrist, and
And signal data can in cell phone client real-time display, item is provided a great convenience for personal drunk driving real-time detection
Part.
Detailed description of the invention
Fig. 1 is that multi-walled carbon nanotube/polyaniline composite material SEM of the utility model schemes；
Fig. 2 is the structural schematic diagram of the alcohol gas sensor of the utility model；
Fig. 3 is that the signal of the situ detection system of the alcohol gas sensor of the utility model embodiment 2 transmits figure；
Fig. 4 is the circuit diagram of the situ detection system of the alcohol gas sensor of the utility model embodiment 2；
Fig. 5 is the response recovery curve of the alcohol gas sensor to different concentration ethanol of the utility model embodiment 2；
Fig. 6 is the cell phone client surface chart of the situ detection system of the alcohol gas sensor of the utility model.
Specific embodiment
The utility model is described further with reference to the accompanying drawing.
Embodiment 1
A kind of room temperature alcohol gas sensor, comprising: by substrate, 2 in substrate parallel square-shaped electrodes and painting
Overlay on the sensitive material composition among 2 parallel square-shaped electrodes, wherein the sensitive material is multi-walled carbon nanotube/polyphenyl
Amine composite material.
Multi-walled carbon nanotube/the polyaniline composite material, is prepared via a method which to obtain, the specific steps are as follows:
Firstly, multi-walled carbon nanotube and aniline monomer are added in 1M/L in perchloric acid solution according to the mass ratio of 1:2, stirred at 0 DEG C
It mixes 30 minutes；Then, density is added dropwise with volume ratio 3:1 into above-mentioned solution is 6*10-3The ammonium persulfate solution of kg/L will mix
Solution stirs 24 hours under the conditions of 0 DEG C, and the polyaniline nano-rod array after polymerization is equably grown on the carbon nanotubes；Most
Afterwards, the multi-walled carbon nanotube polyaniline nano-composite material that will be obtained uses deionized water, methanol and ethanol washing, washing respectively
Nano material later is dried in vacuo 24 hours at 60 DEG C.
Multi-walled carbon nanotube/polyaniline composite material SEM of the utility model schemes as shown in Figure 1, working as multi-wall carbon nano-tube
When the mass ratio of pipe and aniline monomer is 1:2, obtained polyaniline can uniformly be grown in multi-wall carbon nano-tube pipe surface, such as
When the mass ratio of fruit multi-walled carbon nanotube and aniline monomer is greater than 1:2, the reduction meeting of aniline monomer is so that finally obtained compound
The polyaniline nano-line of material surface is very sparse, conversely, polyaniline meeting excess growth is in multi wall when mass ratio is less than 1:2
Carbon nano tube surface, or even the reunion for large area is together, loses the pattern showed in Fig. 1.
A kind of preparation method of room temperature alcohol gas sensor, specific as follows:
Firstly, flexible PET substrate is cleaned by ultrasonic in ethyl alcohol and deionized water, then dry.Utilize sol evenning machine spin coating
One layer photoresist, revolving speed are 800 rpms, and the time is 30 seconds.Then photoetching is carried out, is developed, after development terminates, drying
PET plastic piece plates the golden film of one layer of 50 nanometer thickness, the PET for being coated with golden film is finally put to the gold removed other than electrode in acetone
Film obtains clean complete parallel pole.
Multi-walled carbon nanotube/polyaniline composite material in spin coating between the good parallel square-shaped electrode of photoetching is assembled into big
Small is 1*0.5 centimetres of flexible electrical resistance type gas sensor.
Embodiment 2
A kind of situ detection system of alcohol gas sensor, including power supply, room temperature alcohol gas described in embodiment 1 pass
Sensor, signal filter, single-chip microcontroller, bluetooth and cell phone client；Power supply is sensor power supply, acquisition room temperature alcohol gas sensing
The current signal on device both sides, then current signal is transferred to single-chip microcontroller by signal filter, and signal is after single-chip microcontroller is handled
Cell phone client is uploaded to through bluetooth.
It powers firstly, micro power is exported 1 volt of voltage by source of stable pressure for sensor, then the electricity on sensor both sides
Stream signal is transferred to single-chip microcontroller by signal filter, and signal uploads to cell phone client through bluetooth after single-chip microcontroller is handled
In, cell phone client compares the signal received with resulting standard curve is tested, and draws the song that electric current changes with gas
Line chart and the curve for comparing resulting gas concentration.
The performance test of alcohol gas sensor: gas sensor is connected to electrochemical workstation (occasion China 660) both sides, so
Device is placed in a closed cover afterwards, the alcohol gas of various concentration is injected into cover, sends out the resistance of device
Changing, as shown in Figure 5.It will be considered as safe driving if concentration of alcohol is lower than 47ppm according to Chinese drink-driving standard.
When concentration of alcohol is more than 190ppm, drunk driving will be listed in.The concentration driven when intoxicated is in 47ppm between 190ppm.From figure
As can be seen that the highest detection and lowest detection range of the gas sensor prepared by us are 200ppm and 1ppm, it is sufficiently full
The requirement of foot drunk driving detection.
The situ detection system device of the alcohol gas sensor can be encapsulated in watchband, be worn on the hand of tested people
It exhales at wrist, by cell phone software, the concentration of Ethanol in Gas can be accurately obtained in mobile phone and whether reaches peace
The standard driven entirely, as shown in fig. 6, according to the concentration of alcohol show value of cell phone client can judge driver whether wine
It drives.
3 different experiments parameter of embodiment influences the performance of the utility model alcohol gas sensor
(1), multi-walled carbon nanotube/polyaniline composite material reaction time is reduced into 8h and 12h；
(2), the mass ratio of carbon nanotube and aniline monomer is reduced to original half；
The production method of other experiment parameters and device is same as Example 1, test sensor air-sensitive performance and
The difference of detectability and embodiment 1 for unknown gas concentration.
The experimental results showed that multi-walled carbon nanotube/polyaniline composite material reaction time shortens, polyaniline nano-rod
Length is shorter.When the quality of carbon nanotube reduces, the polyaniline of carbon nano tube surface growth can be fewer, this will lead to device
Electric conductivity reduce, sensitivity reduce, thus reduce for gas concentration detectability, and then hinder for unknown gas
The detection of concentration.Therefore, the optimal reaction time is 24 hours, and the optimum quality ratio of carbon nanotube and aniline monomer is 1:2.
Claims (4)
1. a kind of room temperature alcohol gas sensor characterized by comprising by substrate, 2 parallel electrodes in substrate
And coated in the sensitive material composition among 2 parallel poles, wherein the sensitive material is multi-walled carbon nanotube/polyphenyl
Amine composite material.
2. a kind of room temperature alcohol gas sensor as described in claim 1, which is characterized in that the coating of the sensitive material
With a thickness of 200nm-300nm.
3. a kind of room temperature alcohol gas sensor as described in claim 1, which is characterized in that the electrode is rectangular gold electricity
Pole.
4. a kind of room temperature alcohol gas sensor as described in claim 1, which is characterized in that the substrate is PET base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820757131.8U CN208270473U (en) | 2018-05-21 | 2018-05-21 | A kind of room temperature alcohol gas sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820757131.8U CN208270473U (en) | 2018-05-21 | 2018-05-21 | A kind of room temperature alcohol gas sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469456A (en) * | 2018-05-21 | 2018-08-31 | 吉林大学 | A kind of room temperature alcohol gas sensor and its application in detecting system in situ |
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2018
- 2018-05-21 CN CN201820757131.8U patent/CN208270473U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469456A (en) * | 2018-05-21 | 2018-08-31 | 吉林大学 | A kind of room temperature alcohol gas sensor and its application in detecting system in situ |
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