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Preparation method of WS2/graphene composite aerogel gas sensor

A graphene airgel and graphene composite technology, applied in the field of ultra-sensitive NO2 gas sensors, can solve the problems of incomplete recovery, poor selectivity of gas sensors, and limited practical applications, and achieve uniform temperature and humidity, good gas Sensitive performance, simple and repeatable effect

Inactive Publication Date: 2018-10-19
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single graphene or WS 2 The selectivity of the base gas sensors is very poor, and the recovery is not complete at room temperature, which limits its practical application in the field of gas sensors.

Method used

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  • Preparation method of WS2/graphene composite aerogel gas sensor
  • Preparation method of WS2/graphene composite aerogel gas sensor
  • Preparation method of WS2/graphene composite aerogel gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of graphene aerogel. Add 3mL of graphene oxide aqueous solution with a mass concentration of 2% dropwise to 500μL of ammonia, place it in an oven at 85℃ for 12h to form a wet gel, then wash it several times with deionized water and acetone to remove the wet gel Residual ammonia in water; put the cleaned gel in N 2 The graphene aerogel was heat-treated at 1050°C for 3h in an atmosphere to obtain graphene aerogel; in order to improve the crystallinity of graphene, the obtained graphene aerogel was heat-treated at 2000°C for 1h in a He atmosphere.

[0026] (2)WS 2 / Graphene composite aerogel preparation. Disperse the graphene aerogel after two high temperature heat treatments to 1mol / L (NH 4 ) 2 (WS 4 ) Solution, place the mixed solution in liquid nitrogen to quickly freeze, freeze-dry the frozen liquid to form (NH 4 ) 2 (WS 4 ) Modified graphene aerogel. Will (NH 4 ) 2 (WS 4 ) The modified graphene aerogel is placed in a tube furnace at 2% H 2 / 98%Ar mixed a...

Embodiment 2

[0035] (1) Preparation of graphene aerogel. Add 3mL of graphene oxide aqueous solution with a mass concentration of 2% dropwise to 500μL of ammonia, place it in an oven at 80℃ for 10h to form a wet gel, then wash it several times with deionized water and acetone in turn to remove the wet gel Residual ammonia in water; put the cleaned gel in N 2 The graphene aerogel was heat-treated at 1000°C for 3h in an atmosphere to obtain graphene aerogel; in order to improve the crystallinity of graphene, the obtained graphene aerogel was heat-treated at 1500°C for 2h in a He atmosphere.

[0036] (2)WS 2 / Graphene composite aerogel preparation. Disperse the graphene aerogel after two high-temperature heat treatments to 0.8mol / L (NH 4 ) 2 (WS 4 ) Solution, put the mixed solution in liquid nitrogen to quickly freeze, freeze-dry the frozen liquid to form (NH 4 ) 2 (WS 4 ) Modified graphene aerogel. Will (NH 4 ) 2 (WS 4 ) The modified graphene aerogel is placed in a tube furnace at 3% H 2 / 97%Ar...

Embodiment 3

[0041] (1) Preparation of graphene aerogel. Slowly add 3 mL of graphene oxide aqueous solution with a mass concentration of 2% to 500 μL of ammonia water, place it in a 100 ℃ oven for 15 hours to form a wet gel, and then wash it several times with deionized water and acetone to remove the wet gel. Residual ammonia; put the cleaned gel in N 2 The graphene aerogel was heat-treated at 1100°C for 3h in an atmosphere; in order to improve the crystallinity of graphene, the obtained graphene aerogel was heat-treated at 1800°C for 1.5h in a He atmosphere.

[0042] (2)WS 2 / Graphene composite aerogel preparation. Disperse the graphene aerogel after two high temperature heat treatments to 0.9mol / L (NH 4 ) 2 (WS 4 ) Solution, put the mixed solution in liquid nitrogen to quickly freeze, freeze-dry the frozen liquid to form (NH 4 ) 2 (WS 4 ) Modified graphene aerogel. Will (NH 4 ) 2 (WS 4 ) The modified graphene aerogel is placed in a tube furnace at 5% H 2 / 95%Ar mixed atmosphere at 720℃ he...

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Abstract

The invention discloses a preparation method of a WS2 / graphene composite aerogel gas sensor. The method comprises the following steps of preparing high crystallinity graphene aerogel, then preparing WS2 / graphene composite aerogel, afterwards, preparing WS2 / graphene composite aerogel suspension liquid, enabling the WS2 / graphene composite aerogel to connect with two sensing electrodes, finally adopting a wire bonding technology to connect a sensing electrode chip onto a package substrate through a circuit to manufacture a sensing device. The WS2 / graphene composite aerogel prepared by the preparation method not only maintains the laminar characteristics of two-dimensional materials, but also has a large quantity of cross holes, and still has superhigh effective specific surface area after integrated to the device; the WS2 / graphene composite aerogel gas sensor prepared by the preparation method provided by the invention has a good gas-sensitive property at different temperatures and different humidity.

Description

Technical field [0001] The present invention relates to a semiconductor gas sensor, in particular to a WS-based gas sensor 2 / Graphene composite aerogel is super sensitive to NO under different humidity 2 gas sensor. Background technique [0002] People are currently 2 More and more attention is paid to the problem of gas pollution, and the humidity is not easy to characterize in the actual environment. 2 The detection is particularly important. NO that worked in high humidity environment in the past 2 Gas sensors are mostly based on gas-sensitive materials such as metal oxides or YSZ, but this type of sensor is sensitive to NO 2 The limit detection concentration of gas is higher (> 1ppm), as the relative humidity in the detection environment increases, the sensitivity will greatly decrease, and it is suitable for high-performance NO with different humidity 2 The development of gas sensors faces many challenges. [0003] Graphene has an ultra-high specific surface area due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 闫文君
Owner HANGZHOU DIANZI UNIV
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