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Advanced Nanomaterials for Sensing Applications

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Front. Chem. | doi: 10.3389/fchem.2018.00628

One-Dimensional Zinc Oxide Decorated Cobalt Oxide Nanospheres for Enhanced Gas-Sensing Properties

Hang Zhou1,  Keng Xu1*, Yong Yang1, Ting Yu1, Cailei Yuan1, Wenyan Wei1, Yue Sun1 and Wenhui Lu1
  • 1Jiangxi Normal University, China

In this study, one-dimensional (1D) zinc oxide was loaded on the surface of cobalt oxide microspheres which were assembled by single-crystalline porous nanosheets via a simple heteroepitaxial growth process. This elaborate structure possessed an excellent transducer function from single-crystalline feature of Co3O4 nanosheets and receptor function from zinc oxide nanorods. The structure of the as-prepared hybrid was confirmed via Scanning Electron Microscope (SEM), X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). Gas-sensing tests showed that the gas-sensing properties of the as-designed hybrid were largely improved. The response was about 161 (Ra/Rg) towards 100 ppm ethanol, which is 110 and 10 times higher than that of Co3O4 (Rg/Ra=1.47) and ZnO (Ra/Rg=15), respectively. And the as-designed ZnO/Co3O4 hybrid also shows high selectivity for ethanol. The superior gas-sensing properties were mainly attributed to the as-designed nanostructures that contained super transducer function and super receptor function. The design strategy for gas-sensing materials in this work shed a new light on the exploring of high-performance gas sensors.

Keywords: Gas sensing, Transducer function, Receptor function, Ethanol detection, Single-crystalline

Received: 10 Oct 2018; Accepted: 03 Dec 2018.

Edited by:

Wen Zeng, Chongqing University, China

Reviewed by:

Yan Wang, Henan Polytechnic University, China
Yingming Xu, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, China
Shunping Zhang, Huazhong University of Science and Technology, China  

Copyright: © 2018 Zhou, Xu, Yang, Yu, Yuan, Wei, Sun and Lu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Keng Xu, Jiangxi Normal University, Nanchang, Jiangxi Province, China, xukeng@163.com