Abstract
A metal oxide/graphene composite film-based sensor toward room-temperature detection of ppm-level nitrogen dioxide (NO2) gas has been demonstrated. The sensor prototype was constructed on a PCB substrate with microelectrodes, and a tin oxide-reduced graphene oxide (SnO2-rGO) composite as sensing film was prepared by one-step hydrothermal synthesis of tin tetrachloride pentahydrate solution in the presence of graphene oxide (GO). The SnO2–rGO hybrid composite was examined by scanning electron microscope and x-ray diffraction (XRD). The gas sensing properties of the SnO2-rGO composite were investigated at room temperature by exposing it to a wide concentration ranging from 1 ppm to 2000 ppm toward NO2 gas. The experiment results showed that the sensor exhibited a high response, superior selectivity, good repeatability, rapid response/recovery characteristics and low detection limit of 1 ppm, which exceeded that of a pure rGO sensor. The gas sensing mechanisms of the proposed sensor toward NO2 were possibly attributed to the nano-hybrid structures and n–p heterojunctions created at the interface of the SnO2 nanocrystals and rGO nanosheets.
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Acknowledgements
We acknowledge the funding support from the National Natural Science Foundation of China (No. 51407200), the Science and Technology Development Plan Project of Shandong Province of China (No. 2014GSF117035), the Fundamental Research Funds for the Central Universities of China (Grant No. 15CX05041A), and the Science and Technology Project of Huangdao Zone, Qingdao, China (No. 2014-1-51).
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Zhang, D., Liu, J. & Xia, B. Nitrogen Dioxide-Sensing Properties at Room Temperature of Metal Oxide-Modified Graphene Composite via One-Step Hydrothermal Method. J. Electron. Mater. 45, 4324–4330 (2016). https://doi.org/10.1007/s11664-016-4600-8
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DOI: https://doi.org/10.1007/s11664-016-4600-8