Additive-Free Synthesis of In2O3 Cubes Embedded into Graphene Sheets and Their Enhanced NO2 Sensing Performance at Room Temperature

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• 作者：Wei Yang ; Peng Wan ; Xiaodong Zhou ; Jiming Hu ; Yafeng Guan ; Liang Feng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：December 10, 2014
• 年：2014
• 卷：6
• 期：23
• 页码：21093-21100
• 全文大小：492K
• ISSN：1944-8252

文摘

In this report, we developed an additive-free synthesis of In₂O₃ cubes embedded into graphene networks with InN nanowires (InN-NWs) and graphene oxide (GO) as precursors by a facile one-step microwave-assisted hydrothermal method. In absence of GO, the InN-NWs maintained their chemical composition and original morphology upon the same treatment. At varying mass ratios of InN-NWs and GO, the different morphologies and distributions of In₂O₃ could be obtained on graphene sheets. The uniform distribution, which is usually considered favorable for enhanced sensing performance, was observed in In₂O₃ cubes/reduced graphene oxide (rGO) composites. The room-temperature NO₂ sensing properties of the In₂O₃ cubes/rGO composites-based sensor were systematically investigated. The results revealed that the sensor exhibited a significant response to NO₂ gas with a concentration lower to 1 ppm, and an excellent selectivity, even though the concentrations of interferential gases were 1000 times that of NO₂. The enhanced NO₂ sensing performances were attributed to the synergistic effect of uniformly distributed In₂O₃ cubes and graphene sheets in the unique hybrid architectures without the interfering of extra additives.

Keywords:

In₂O₃ cubes; precursor; graphene oxide; sensing performance; synergistic effect