Enhanced positive humidity sensitive behavior of p-reduced graphene oxide decorated with n-WS2 nanoparticles

• 作者: Zai-Hua Duan Qiu-Ni Zhao Cheng-Zhen Li Si Wang Ya-Dong Jiang Ya-Jie Zhang Bo-Hao Liu Hui-Ling Tai
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 1762-1767
• 页数: 6页
• 语种: 英文

摘要

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.