Methanol gas sensor and preparation method thereof

A gas sensor and sensor technology, applied in the field of sensors, to achieve the effects of no sintering, good selectivity and high responsiveness

Inactive Publication Date: 2016-06-08

CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a sensor based on graphene oxide doped Sn...

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.

Application Domain

Material electrochemical variables

Technology Topic

IonGraphite oxide +7

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Examples

Experimental program(2)

Example Embodiment

[0020] Example 1.

[0021] 1) Take 100 parts of Sn (bipyO 2 ) 2 Cl 2 Grind the solid for 3 hours, then uniformly disperse it in deionized water under 30kHz ultrasound; take another 0.1 part by weight of graphene oxide, under 30kHz ultrasound, after uniformly dispersing in deionized water under ultrasound, slowly add to Sn under ultrasound (BipyO 2 ) 2 Cl 2 80% of the dispersion is evaporated, and then 0.1% polyvinyl alcohol is added to obtain a sol.

[0022] 2) Take a round aluminum oxide ceramic substrate, put it in a sodium hydroxide solution with a concentration of 6 mol/L and boil for 30 minutes, take it out after cooling, rinse it with distilled water three times, and place it in an oven for drying. The Au paste is coated on the cleaned Al2O3 ceramic substrate to make interdigital electrodes, dried, and then a Pt wire with a diameter of 0.1mm is welded to the electrode as a lead wire.

[0023] 3) Doping the graphene prepared in step 1) with Sn (bipyO 2 ) 2 Cl 2 The hydrosol is sprayed on the metal electrode and the insulating ceramic substrate with an electric spray gun to prepare a gas-sensitive material layer, and then dried at 150°C to obtain the sensor element.

Example Embodiment

[0024] Example 2.

[0025] 1) Take 100 parts of Sn (bipyO 2 ) 2 Cl 2 Grind the solid for 3 hours, then uniformly disperse it in deionized water under 40kHz ultrasound; take another 0.5 part of graphene oxide, under 40kHz ultrasound, after uniformly dispersing it in deionized water, slowly add it to Sn under ultrasound (BipyO 2 ) 2 Cl 2 In the dispersion liquid, two-thirds of the water is evaporated, and 0.1% polyvinyl alcohol is added to obtain a sol.

[0026] 2) Take a round aluminum oxide ceramic substrate, put it in a sodium hydroxide solution with a concentration of 6 mol/L and boil for 30 minutes, take it out after cooling, rinse it with distilled water three times, and place it in an oven for drying. The Au paste is coated on the cleaned Al2O3 ceramic substrate to make interdigital electrodes, dried, and then a Pt wire with a diameter of 0.1mm is welded to the electrode as a lead wire.

[0027] 3) Doping the graphene prepared in step 1) with Sn (bipyO 2 ) 2 Cl 2 The sol is sprayed on the metal electrode and the insulating ceramic substrate with an electric spray gun to prepare a gas-sensitive material layer, and then dried at 150°C to obtain the sensor element.

PUM

Property	Measurement	Unit
Thickness	5.0	µm
Thickness	10.0 ~ 60.0	µm

Description & Claims & Application Information

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Methanol gas sensor and preparation method thereof

A gas sensor and sensor technology, applied in the field of sensors, to achieve the effects of no sintering, good selectivity and high responsiveness

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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