Significantly enhanced temperature-dependent selectivity for NO2 and H2S detection based on In2O3 nano-cubes prepared by CTAB assisted solvothermal process

Li, Zhijie, Yan, Shengnan, Sun, Mengxuan, Li, Hao, Wu, Zhonglin, Wang, Junqiang, Shen, Wenzhong and Fu, Yong Qing (2019) Significantly enhanced temperature-dependent selectivity for NO2 and H2S detection based on In2O3 nano-cubes prepared by CTAB assisted solvothermal process. Journal of Alloys and Compounds. p. 152518. ISSN 0925-8388 (In Press)

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Official URL: https://doi.org/10.1016/j.jallcom.2019.152518

Abstract

It is a huge challenge to develop a highly precision sensor with good selectivity for target gas. In this work, In2O3 nano-cubes, prepared using a cetyltrimethyl ammonium bromide assisted solvothermal process, were used to make gas sensors for H2S and NO2 detections. The In2O3 nano-cube based sensor exhibited a good temperature-dependent selectivity toward H2S and NO2. At room temperature of 25 °C, the sensor exhibited a good selectivity towards H2S with a high response (1461 for 60 ppm H2S), fast response/recovery times (82 s/102 s) and a superior detection limit (0.005 ppm). Whereas at an operation temperature of 100 °C, the sensor showed a poor sensitivity to H2S, but an excellent selectivity towards NO2 with high response (336 for 100 ppm NO2), fast response/recovery times (18 s/31 s) and a superior detection limit (0.001 ppm). The sensor also showed good reversibility, reproducibility and long-term stability at two optimized operation temperatures. The different sensing mechanisms for H2S and NO2 were discussed and the temperature dependent selectivity was explained.

Item Type: Article
Uncontrolled Keywords: In2O3, Nano-cube, NO2, H2S, Gas sensor
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 03 Oct 2019 11:29
Last Modified: 18 Oct 2019 09:00
URI: http://nrl.northumbria.ac.uk/id/eprint/40969

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