Bacterial Cellulose Templated p-Co3O4/n-ZnO Nanocomposite with Excellent VOCs Response Performance |
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Authors: | Ling-li Qi Chun-yan Zhong Zan-hong Deng Tian-tian Dai Jun-qing Chang Shi-mao Wang Xiao-dong Fang Gang Meng |
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Institution: | a.Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Chinab.University of Science and Technology of China, Hefei 230026, Chinac.Advanced Laser Technology Laboratory of Anhui Province, Chinese Academy of Sciences, Hefei 230037, Chinad.Hainan Yeguo Food Co., LTD, Haikou 570311, Chinae.Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, China |
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Abstract: | In this work, p-type Co\begin{document}$_3$\end{document}O\begin{document}$_4$\end{document} decorated n-type ZnO (Co\begin{document}$_3$\end{document}O\begin{document}$_4$\end{document}/ZnO) nanocomposite was designed with the assistance of bacterial cellulose template. Phase composition, morphology and element distribution were investigated by XRD, SEM, HRTEM, EDS mapping and XPS. Volatile organic compounds (VOCs) sensing measurements indicated a noticeable improvement of response and decrease of working temperature for Co\begin{document}$_3$\end{document}O\begin{document}$_4$\end{document}/ZnO sensor, in comparison with pure ZnO, i.e., the response towards 100 ppm acetone was 63.7 (at a low working temperature of 180 ℃), which was 26 times higher than pure ZnO (response of 2.3 at 240 ℃). Excellent VOCs response characteristics could be ascribed to increased surface oxygen vacancy concentration (revealed by defect characterizations), catalytic activity of Co\begin{document}$_3$\end{document}O\begin{document}$_4$\end{document} and the special p-n heterojunction structure, and bacterial cellulose provides a facile template for designing diverse functional heterojunctions for VOCs detection and other applications. |
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Keywords: | Bacterial cellulose Heterojunction Metal oxide composite ZnO Gas sensor |
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