1. Enhanced room-temperature NO2 response of noble metal decorated α-Fe2O3/SnO2–rGO hybrids.
- Author
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Zhang, Yaqing, Zhao, Liang, Yang, Zhimin, Xing, Yunpeng, Xin, Congcong, Wei, Zefeng, Fei, Teng, Liu, Sen, and Zhang, Tong
- Subjects
PRECIOUS metals ,GAS detectors ,BAND gaps ,GRAPHENE oxide ,CATALYTIC activity - Abstract
Reduced graphene oxide (rGO)-based materials are deemed as promising candidates for fabrication of room-temperature gas sensors, while a tougher challenge is to develop an effective strategy for improving gas responses. Here, a noble metal decoration strategy is developed to enhance NO
2 responses of α-Fe2 O3 /SnO2 –rGO hybrids. Noble metal decorated α-Fe2 O3 /SnO2 –rGO hybrids were prepared by depositing noble metals onto α-Fe2 O3 /SnO2 –rGO hybrids through reduction of noble metal ions by NaBH4 . Most importantly, Pt modified α-Fe2 O3 /SnO2 –rGO hybrids (designated as Pt-FSR) exhibit the highest response value of 21.3 toward 5 ppm NO2 , which is much higher than that of α-Fe2 O3 /SnO2 –rGO (8.8). Combined characterization studies indicate that the enhanced NO2 response of Pt-FSR is attributed to the narrow band gap of Pt-FSR, small particle size and excellent catalytic activity of Pt. The NO2 sensing mechanism is also investigated by FT-IR spectroscopy. The findings proposed in this work not only broaden the study of room-temperature gas sensors, but also provide suggestions for discovering the gas sensing mechanism. [ABSTRACT FROM AUTHOR]- Published
- 2023
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