期刊
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
卷 26, 期 8, 页码 5937-5945出版社
SPRINGER
DOI: 10.1007/s10854-015-3165-2
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资金
- National Natural Science Foundation of China [51407200]
- Science and Technology Plan Project of Shandong Province [2014GSF117035]
- Promotive Research Foundation for the Excellent Middle-Aged and Youth Scientists of Shandong Province of China [BS2012DX044]
- Science and Technology Development Plan Project of Qingdao [13-1-4-179-jch]
- Open Fund of National Engineering Laboratory for Ultra High Voltage Engineering Technology (Kunming, Guangzhou) [NEL201518]
- Fundamental Research Funds for the Central Universities of China [15CX05041A]
- Science and Technology Project of Huangdao Zone, Qingdao, China [2014-1-51]
In this paper, we synthetized a hybrid composite of zinc oxide (ZnO) nanocrystalline-decorated reduced graphene oxide (rGO) via a facile hydrothermal process, and fabricated a methane gas sensor by using the ZnO-rGO hybrid composite as sensing film coated on a ceramic tube with Ni-Cr heater. The presence of nanorod-shaped ZnO nanocrystalline and rGO nanosheets was characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance and photoluminescence spectra measurement. The sensing properties of the ZnO-rGO film sensor were investigated by exposing to various concentration of methane gas at different temperature. It was found that the presented sensor exhibited unique advantages in methane gas sensing with concentration spanning from 100 to 4000 ppm, such as outstanding repeatability, fast response-recovery time as well as good selectivity, at an optimal operating temperature of 190 degrees C. The gas response of the ZnO-rGO hybrid composite was superior to that of the pure ZnO and rGO counterpart in methane gas sensing. The possible and proposed sensing mechanism for the sensor is mainly attributed to its nano-hybrid structure and special interactions at p-n heterojunction. This observed results highlight the ZnO-rGO hybrid composite as a candidate material for constructing methane gas sensors.
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