Fabrication of Humidity Sensors Based on Laser Scribed Graphene Oxide/SnO<sub>2 </sub>Composite Layers

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摘要 Humidity sensors have been widely applied to detect environment humidity in various fields. However, most of humidity sensors cannot provide performance needed for high sensitivity and fast response. We report one type of capacitive-type humidity sensors composed of laser-scribed graphene (LSG) as sensing electrodes and graphene oxide/tin dioxide (GO/SnO2) as a sensing layer. The LSG is reduced graphene oxide (rGO) electrodes resulted from selective reducing of GO within a GO/SnO2 composite layer by laser scribing method, and the sensing layer is the un-scribed GO/SnO2 composite. The sensor fabrication is a one-step process which is facile and cost-efficient. When a mass ratio of GO:SnO2 in the composite reaches 1:1, the humidity sensor (named as LSG-GS1) has the best properties than other ratios, which exhibits high sensitivity in the range of 11%～97% relative humidity (RH). In addition, the LSG-GS1 also has very quick response/recovery time (20 s for adsorption and 18 s for desorption) when RH changes from 23% to 84%, and very good stability after monitoring for 41 days. Such excellent performances of the humidity sensor can be attributed to synergistic effect of SnO2 and GO within the composite layer.

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	李歆
	冯文豆
	张祥昕
	王维
	陈素晶
	张易宁

关键词 ： humidity sensor, tin dioxide, graphene, laser scribed

Abstract：Humidity sensors have been widely applied to detect environment humidity in various fields. However, most of humidity sensors cannot provide performance needed for high sensitivity and fast response. We report one type of capacitive-type humidity sensors composed of laser-scribed graphene (LSG) as sensing electrodes and graphene oxide/tin dioxide (GO/SnO2) as a sensing layer. The LSG is reduced graphene oxide (rGO) electrodes resulted from selective reducing of GO within a GO/SnO2 composite layer by laser scribing method, and the sensing layer is the un-scribed GO/SnO2 composite. The sensor fabrication is a one-step process which is facile and cost-efficient. When a mass ratio of GO:SnO2 in the composite reaches 1:1, the humidity sensor (named as LSG-GS1) has the best properties than other ratios, which exhibits high sensitivity in the range of 11%～97% relative humidity (RH). In addition, the LSG-GS1 also has very quick response/recovery time (20 s for adsorption and 18 s for desorption) when RH changes from 23% to 84%, and very good stability after monitoring for 41 days. Such excellent performances of the humidity sensor can be attributed to synergistic effect of SnO2 and GO within the composite layer.

Key words： humidity sensor tin dioxide graphene laser scribed

收稿日期: 2020-01-17 出版日期: 2020-11-09

基金资助:This project was supported by the Fujian Provincial Department of Science and Technology (No. 2018H0041, 2018H0042, 2018T3010, 2019T3017 and 2019T3024)

通讯作者: ynzhang@fjirsm.ac.cn E-mail: ynzhang@fjirsm.ac.cn

引用本文:

李歆;冯文豆;张祥昕;王维;陈素晶;张易宁. Fabrication of Humidity Sensors Based on Laser Scribed Graphene Oxide/SnO₂Composite Layers[J]. 结构化学, 2020, 39(11): 1949-1957.
LI Xin;FENG Wen-Dou;ZHANG Xiang-Xin;WANG Wei;CHEN Su-Jing;ZHANG Yi-Ning. Fabrication of Humidity Sensors Based on Laser Scribed Graphene Oxide/SnO2 Composite Layers. CHINESE JOURNAL OF STRUCTURAL CHEMISTRY, 2020, 39(11): 1949-1957.

链接本文:

http://manu30.magtech.com.cn/jghx/CN/ 或 http://manu30.magtech.com.cn/jghx/CN/Y2020/V39/I11/1949

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