首页|Enhanced positive humidity sensitive behavior of p-reduced graphene oxide decorated with n-WS2 nanoparticles
Enhanced positive humidity sensitive behavior of p-reduced graphene oxide decorated with n-WS2 nanoparticles
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Most resistance-type humidity sensors exhibit negative humidity sensitivity,i.e.,their resistance decrea-ses with a corresponding increase in humidity.This is primarily attributed to the dominant role of ionic conduc-tion in adsorbed water.In this work,a humidity sensor based on a p-type reduced graphene oxide(p-rGO)with positive humidity sensitivity is proposed.Moreover,its positive humidity sensing response is further enhanced by n-type WS2 nanoparticles modification.The results show that both rGO and rGO/WS2 humidity sensors have good linear response in the relative humidity(RH)range of 0％-91.5％.The sensitivity of the rGO/WS2 humidity sensor is 1.87 times that of rGO humidity sensor,which is mainly attributed to p-n heterojunction between rGO and WS2.Besides,the rGO/WS2 humidity sensor has small humidity hysteresis(～3％RH)and good repeatability.This work demonstrates a humidity sensor based on rGO/WS2 composite film and provides a facile route for fabri-cating humidity sensor with positive humidity sensing properties.
Zai-Hua Duan、Qiu-Ni Zhao、Cheng-Zhen Li、Si Wang、Ya-Dong Jiang、Ya-Jie Zhang、Bo-Hao Liu、Hui-Ling Tai
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State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China
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