CN105651835A - Methanol gas sensor and preparation method thereof - Google Patents
Methanol gas sensor and preparation method thereof Download PDFInfo
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- CN105651835A CN105651835A CN201410633670.7A CN201410633670A CN105651835A CN 105651835 A CN105651835 A CN 105651835A CN 201410633670 A CN201410633670 A CN 201410633670A CN 105651835 A CN105651835 A CN 105651835A
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Abstract
The present invention discloses a methanol gas sensor and a preparation method thereof. The sensor comprises an insulating ceramic substrate, a pair of metal electrodes arranged on the insulating ceramic substrate, metal leading-out conducting wires, and a gas sensitive material layer sprayed on the metal electrodes and the insulating ceramic substrate, wherein graphene oxide is doped with a Sn(bipyO2)2Cl2 material to form the gas sensitive material layer. The preparation method comprises: taking 100 parts by weight of a Sn(bipyO2)2Cl2 solid, grinding for 3 h, and carrying out ultrasonic uniform dispersion in deionized water; taking 0.1-0.5 part by weight of graphene oxide, carrying out ultrasonic uniform dispersion in deionized water, and slowly adding to the Sn(bipyO2)2Cl2 dispersion system under ultrasonic vibration; and evaporating out a proper amount of water, spraying the obtained sol onto the interdigital electrodes and the insulating substrate, and drying for 4 h. According to the present invention, the sensor has advantages of good selectivity, high response, rapid response, rapid recovery and being free of sintering, and can work at a room temperature.
Description
Technical field
The present invention relates to sensor field, in particular it relates to a kind of methanol gas sensor and preparation method thereof, this sensor is based on graphene oxide doped Sn(bipyO2)2Cl2Gas sensitive.
Background technology
Gas sensor is the device of a kind of information information such as the composition of gas, concentration being converted to and can being utilized by instrument and meter, computer etc., and its kind includes: semiconductor gas sensor, electrochemical gas sensor, catalytic combustion method gas sensor, thermal conductivity gas sensor, infrared gas sensor etc. Its operation principle is usually gas molecule and occurs adsorption and desorption, catalysis burning, oxidoreduction etc. to interact with gas sensitive surface, the electrochemical properties making material changes, under additional circuit, by the measurement of electric current, change in voltage in circuit, it is achieved gas detecting. Along with improving constantly and pay attention to day by day to environmental protection of people's living standard, detection to various poisonous, harmful gass, to atmospheric pollution, the monitoring of industrial waste gas and gas sensor is all had higher requirement by the detection of food and habitation environment quality. The successful Application of some new material development technology nanometer, thin film techniques etc., integrated for gas sensor and intelligent provide good precondition. Gas sensor will be developed on the basis of the multidisciplinary synthesis technology such as micromechanics and microelectric technique, computer technology, signal processing technology, sensing technology, fault diagnosis technology, intellectual technology making full use of. Developing Full automatic digital formula intelligent gas sensor will be the important research direction in this field.
Methanol has stronger toxicity, and colourless has alcohol smell volatile. Nervous system and blood system to human body have the greatest impact, it through digestive tract, respiratory tract or skin take in all can produce toxic reaction, methanol vapor energy loss victimize respiratory mucosa and vision. Acute poisoning symptom has: headache, feel sick, stomachache, tired, blurred vision so that blind, dyspnea then, final threat to life. But, methanol is again basic organic chemical raw material and high-grade fuel. It is mainly used in the fields such as fine chemistry industry, plastics, is used for manufacturing the multiple organic productss such as formaldehyde, acetic acid, chloromethanes, first ammonia, dimethyl sulfate, be also one of pesticide, medical important source material. In recent years, the security incident that China causes because of methanol is a lot, causes very big life and property loss.Therefore, Work Safety Supervision Bureau of country regulation, at the factory floor using methanol, methanol gas alarm must be installed, to protect safety of workers. Currently used methanol sensor selectivity is not good enough.
Summary of the invention
Present invention aims to the deficiency of existing gas sensor, it is provided that a kind of based on graphene oxide doped Sn(bipyO2)2Cl2Methanol gas sensor of gas sensitive and preparation method thereof.
Methanol gas sensor provided by the present invention is made up of insulating substrate, pair of metal electrodes, metal extraction wire and gas sensitive layer successively, and wherein gas sensitive layer of material includes polyvinyl alcohol adhesive.
Described gas sensitive layer is by graphene oxide doped Sn(bipyO2)2Cl2Material forms.
Flit size 500nm-5 ��m of Graphene, thickness 0.8-3.5 nanometer.
Described gas sensitive layer thickness is 10-60 ��m.
Described insulating substrate is aluminum oxide ceramic square substrate.
Described metal electrode is the interdigital electrode made by metal Au, and the distance between two electrodes is 1mm.
Described metal lead-outs is made up of Pt metal silk.
The described methanol gas detailed preparation method of Sensor Gas sensor, including below step.
1) graphene oxide doped Sn(bipyO is prepared2)2Cl2Material, takes Sn(bipyO 100 parts heavy2)2Cl2Solid, grinds 3 hours, then ultrasonic dispersed in deionized water, separately take 0.1-0.5 part weight graphene oxide, in deionized water ultrasonic dispersed after, be slowly added into Sn(bipyO under vibration of ultrasonic wave2)2Cl2Dispersion liquid in, evaporate appropriate water, obtain colloidal sol.
2) Au slurry is coated on the insulating ceramics substrate after cleaning, after drying, welds metal lead-outs.
3) the Graphene doping Sn(bipyO prepared by step 1)2)2Cl2Colloidal sol on metal electrode with insulating ceramics substrate, prepare into gas sensitive layer with electronic spray gun spraying, then 150 DEG C of drying obtain sensor element.
Beneficial effect: it is good that methanol gas sensor provided by the invention has selectivity, responsiveness is high, and response and recovery are fast, non-sintered, the advantage that can at room temperature work.
Accompanying drawing explanation
Fig. 1 is the responsiveness that described methanol gas sensor is exposed to a series of inorganic gas and volatile organic compounds.
Fig. 2 is that the responsiveness of the methanol gas sensor of embodiment 1 preparation is with methanol concentration change curve.
Detailed description of the invention
Below by specific embodiment, the present invention is described in further detail, but the invention is not limited in this.
Embodiment 1.
1) Sn(bipyO 100 parts heavy is taken2)2Cl2Solid, grinds 3 hours, then under 30kHz ultrasound wave, dispersed in deionized water; Separately take graphene oxide 0.1 part heavy, under 30kHz is ultrasonic, after deionized water for ultrasonic is dispersed, under ultrasound wave, be slowly added into Sn(bipyO2)2Cl2Dispersion liquid in, evaporate 80 percent, add the polyvinyl alcohol of 0.1%, obtain colloidal sol.
2) take aluminum oxide ceramic circular substrate, put into the sodium hydroxide solution that concentration is 6 mol/L and boil 30 minutes, take out after cooling, with distilled water flushing three times, be placed in baking oven and dry. Au slurry is coated on cleaned aluminum oxide ceramic substrate and makes interdigital electrode, dries, then the Pt wire bond of diameter 0.1mm is received on electrode as lead-out wire.
3) the Graphene doping Sn(bipyO prepared by step 1)2)2Cl2The hydrosol on metal electrode with insulating ceramics substrate, prepare into gas sensitive layer with electronic spray gun spraying, then 150 DEG C of drying obtain sensor element.
Embodiment 2.
1) Sn(bipyO 100 parts heavy is taken2)2Cl2Solid, grinds 3 hours, then under 40kHz ultrasound wave, dispersed in deionized water; Separately take graphene oxide 0.5 part heavy, under 40kHz ultrasound wave, after deionized water for ultrasonic is dispersed, under ultrasound wave, be slowly added into Sn(bipyO2)2Cl2Dispersion liquid in, evaporate the water of 2/3rds, add the polyvinyl alcohol of 0.1%, obtain colloidal sol.
2) take aluminum oxide ceramic circular substrate, put into the sodium hydroxide solution that concentration is 6 mol/L and boil 30 minutes, take out after cooling, with distilled water flushing three times, be placed in baking oven and dry. Au slurry is coated on cleaned aluminum oxide ceramic substrate and makes interdigital electrode, dries, then the Pt wire bond of diameter 0.1mm is received on electrode as lead-out wire.
3) the Graphene doping Sn(bipyO prepared by step 1)2)2Cl2Colloidal sol on metal electrode with insulating ceramics substrate, prepare into gas sensitive layer with electronic spray gun spraying, then 150 DEG C of drying obtain sensor element.
Claims (8)
1. a methanol gas sensor, it is characterised in that: being made up of insulating ceramics substrate, pair of metal electrodes, metal extraction wire and gas sensitive layer successively, wherein gas sensitive layer includes a kind of polyvinyl alcohol adhesive.
2. the methanol gas sensor described in claim 1, it is characterised in that: described gas sensitive layer is by graphene oxide doped Sn(bipyO2)2Cl2Material forms.
3. the methanol gas sensor described in claim 1, it is characterised in that: flit size 500nm-5 ��m of described Graphene, thickness 0.8-3.5 nanometer.
4. the methanol gas sensor described in claim 1, it is characterised in that: described gas sensitive layer thickness is 10-60 ��m.
5. the methanol sensor described in claim 1, it is characterised in that: described insulating ceramics substrate is aluminium sesquioxide round insulation ceramic substrate.
6. the methanol gas sensor described in claim 1, it is characterised in that: the interdigital electrode that described metal electrode is made up of metal Au, the distance between two electrodes is 1mm.
7. the methanol gas sensor described in claim 1, it is characterised in that: described metal lead-outs is Pt metal silk.
8. the preparation method of methanol gas sensor according to any one of preparation claim 1-6, including below step:
1) graphene oxide doped Sn(bipyO is prepared2)2Cl2Material, takes Sn(bipyO 100 parts heavy2)2Cl2Solid, grinds 3 hours, then ultrasonic dispersed in deionized water, separately take 0.1-0.5 part weight graphene oxide, in deionized water ultrasonic dispersed after, be slowly added into Sn(bipyO under vibration of ultrasonic wave2)2Cl2Dispersion liquid in, evaporate appropriate water and obtain colloidal sol;
2) Au slurry is coated on the insulating ceramics substrate after cleaning, after drying, welds metal lead-outs;
3) the Graphene doping Sn(bipyO prepared by step 1)2)2Cl2Colloidal sol on metal electrode with insulating ceramics substrate, prepare into gas sensitive layer with electronic spray gun spraying, then 150 DEG C of drying obtain sensor element.
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CN108318510A (en) * | 2018-01-09 | 2018-07-24 | 山东大学 | A kind of platinum/tin oxide nano particles cluster gas sensor and preparation method thereof of redox graphene package |
CN114621262A (en) * | 2020-12-14 | 2022-06-14 | 中国科学院大连化学物理研究所 | Preparation and application of metal nanocluster material for rapidly detecting methanol |
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