Double-Shell Architectures of ZnFe2O4 Nanosheets on ZnO Hollow Spheres for High-Performance Gas Sensors

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• 作者：Xiaowei Li ; Chen Wang ; Hang Guo ; Peng Sun ; Fengmin Liu ; Xishuang Liang ; Geyu Lu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：7
• 期：32
• 页码：17811-17818
• 全文大小：551K
• ISSN：1944-8252

文摘

In this study, double-shell composites consisting of inner ZnO hollow microspheres (ZHS) surrounded by outer ZnFe₂O₄ nanosheets were successfully synthesized. The growth of the ultrathin ZnFe₂O₄ nanosheets (鈭?0 nm) on the ZHS outer surface was carried out at room temperature via solution reactions in order to generate a double-shell configuration that could provide a large surface area. As a proof-of-concept demonstration of the design, a comparative sensing investigation between the sensors based on the as-obtained ZnO/ZnFe₂O₄ composites and its two individual components (ZnO hollow spheres and ZnFe₂O₄ nanosheets) was performed. As expected, the response of the ZnFe₂O₄-decorated ZnO composites to 100 ppm acetone was about 3 times higher than that of initial ZnO microspheres. Moreover, a dramatic reduction of response/recover time has been achieved at different operating temperature. Such favorable sensing performances endow these ZnO/ZnFe₂O₄ heterostructures with a potential application in gas sensing.