期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 41, 页码 38116-38125出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12168
关键词
humidity sensor; ultrahigh sensitivity; urchin-like Ti3C2/TiO2 composite; alkali oxidation; ionic conductivity behavior
资金
- Science and Technology Innovation Commission of Shenzhen [JCYJ20180305124942832, JCYJ20170818091233245, KQTD20170810105439418]
- Postdoctoral Science Foundation of China [2018M633130]
- National Natural Science Foundation of China [61903259, 81701819]
- Natural Science Foundation of Guangdong Province [2017A030310495]
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 (similar to 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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