材料科学
复合数
湿度
纳米线
相对湿度
化学工程
复合材料
纳米技术
光电子学
MXenes公司
气象学
物理
工程类
作者
Ning Li,Yue Jiang,Chuanhong Zhou,Yan Xiao,Bo Meng,Ziya Wang,Dazhou Huang,Chenyang Xing,Zhengchun Peng
标识
DOI:10.1021/acsami.9b12168
摘要
Humidity sensors have broad applications in health monitoring, environmental protection and human-machine interface, and robotics. Here, we developed a humidity sensor using alkali oxidation method to grow in situ TiO2 nanowires on two-dimensional Ti3C2 MXene. With an order of magnitude larger surface area compared to pure Ti3C2 or TiO2 materials, the urchin-like Ti3C2/TiO2 composite demonstrates a record high sensitivity in a low relative humidity (RH) environment (∼280 pF/% RH from 7% RH to 33% RH). Complex impedance spectroscopy and Schottky junction theory were employed to understand the underlying sensing mechanisms of the Ti3C2/TiO2 composite under various humidity conditions. We demonstrate the application of humidity sensors made with the Ti3C2/TiO2 composite for noncontact detection of the presence of various liquids as well as human fingers.
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