High Selectivity Gas Sensing and Charge Transfer of SnSe2

Óscar Leonardo Camargo Moreira, Wei Ying Cheng, Huei Ru Fuh*, Wei Chen Chien, Wenjie Yan, Haifeng Fei, Hongjun Xu, Duan Zhang, Yanhui Chen, Yanfeng Zhao, Yanhui Lv, Gang Wu, Chengzhai Lv, Sunil K. Arora, Cormac Ó Coileáin, Chenglin Heng, Ching Ray Chang, Han Chun Wu

*此作品的通讯作者

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81 引用 (Scopus)

摘要

SnSe2 is an anisotropic binary-layered material with rich physics, which could see it used for a variety of potential applications. Here, we investigate the gas-sensing properties of SnSe2 using first-principles calculations and verify predictions using a gas sensor made of few-layer SnSe2 grown by chemical vapor deposition. Theoretical simulations indicate that electrons transfer from SnSe2 to NO2, whereas the direction of charge transfer is the opposite for NH3. Notably, a flat molecular band appears around the Fermi energy after NO2 adsorption and the induced molecular band is close to the conduction band minimum. Moreover, compared with NH3, NO2 molecules adsorbed on SnSe2 have a lower adsorption energy and a higher charge transfer value. The dynamic-sensing responses of SnSe2 sensors confirm the theoretical predictions. The good match between the theoretical prediction and experimental demonstration suggests that the underlying sensing mechanism is related to the charge transfer and induced flat band. Our results provide a guideline for designing high-performance gas sensors based on SnSe2.

源语言英语
页(从-至)2546-2552
页数7
期刊ACS Sensors
4
9
DOI
出版状态已出版 - 27 9月 2019

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