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High-Performance Humidity Sensor Based on Urchin-Like Composite of Ti 3 C 2 MXene-Derived TiO 2 Nanowires

2019; American Chemical Society; Volume: 11; Issue: 41 Linguagem: Inglês

10.1021/acsami.9b12168

1944-8252

Ning Li, Yue Jiang, Chuanhong Zhou, Yan Xiao, Bo Meng, Ziya Wang, Dazhou Huang, Chenyang Xing, Zhengchun Peng,

2D Materials and Applications

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.