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

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 TiO nanowires on two-dimensional Ti C MXene. With an order of magnitude larger surface...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2019-10, Vol.11 (41), p.38116-38125
Main Authors: Li, Ning, Jiang, Yue, Zhou, Chuanhong, Xiao, Yan, Meng, Bo, Wang, Ziya, Huang, Dazhou, Xing, Chenyang, Peng, Zhengchun
Format: Article
Language:English
Subjects:
Animals
Humidity
Nanowires - chemistry
Sea Urchins
Titanium - chemistry
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Summary: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 TiO nanowires on two-dimensional Ti C MXene. With an order of magnitude larger surface area compared to pure Ti C or TiO materials, the urchin-like Ti C /TiO 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 Ti C /TiO composite under various humidity conditions. We demonstrate the application of humidity sensors made with the Ti C /TiO composite for noncontact detection of the presence of various liquids as well as human fingers.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.9b12168