Rational design of Bi-doped rGO/Co3O4 nanohybrids for ethanol sensing

Cai, Sheng-Xun, Song, Xian-Qiang, Chi, Zong-Tao, Fu, Yong Qing, Fang, Zheng-Tao, Geng, Sun-Ying-Yue, Kang, Ya-Ru, Yang, Xiao-Xu, Qin, Jian-Feng and Xie, Wan-Feng (2021) Rational design of Bi-doped rGO/Co3O4 nanohybrids for ethanol sensing. Sensors and Actuators B: Chemical, 343. p. 130118. ISSN 0925-4005

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Official URL: https://doi.org/10.1016/j.snb.2021.130118


Gas sensors based on metal oxide semiconductors (MOSCs) and reduced graphene oxide (rGO) for sensing of organic volatile compounds often suffer from high operation temperature, low responses, poor selectivity, or narrow detection range. Herein, we design and fabricate Bi-doped rGO/Co3O4 (BGCO) nanohybrids with a flower morphology, which have been applied as a sensing layer for an ethanol sensor. This BGCO sensor exhibits a maximum p-type response of 178.1 towards 500 ppm ethanol at an optimum working temperature of 120 °C. The sensor’s detection range for the ethanol concentration is from 500 ppb to 500 ppm, and the sensor has an excellent selectivity to ethanol compared to other types of organic volatile gases and oxidizing gas such as NO2. The enhanced ethanol sensing mechanism is attributed to the increased conductivity of Bi doped rGO/Co3O4 material. Additionally, incorporation of Bi dopant can promote the redox reaction, and the rGO/Co3O4 act as the catalyst.

Item Type: Article
Additional Information: Funding information: This work was financially supported by the National Natural Science Foundation of China (Grant No. 51227804). This work was also funded by the Postdoctoral Scientific Research Foundation of Qingdao, National College Students Innovation and Entrepreneurship Training Program of China (No. G201911065028), College Students Innovation and Entrepreneurship Training Program of Qingdao University (X201911065058). The authors would like to thank the Chemical Experimental Teaching Center of Qingdao University for the characterizations, and Kehui Han from Shiyanjia Lab (www.shiyanjia.com) for the XPS and UPS analysis.
Uncontrolled Keywords: Semiconducting metal oxider, rGO. Bi doped Co3O4, Ethanol sensor, Resistive sensor
Subjects: F200 Materials Science
H600 Electronic and Electrical Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 07 Jun 2021 13:19
Last Modified: 17 May 2022 03:31
URI: http://nrl.northumbria.ac.uk/id/eprint/46368

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