Additive-free synthesis of In₂O₃ cubes embedded into graphene sheets and their enhanced NO₂ sensing performance at room temperature.
Additive-free synthesis of In₂O₃ cubes embedded into graphene sheets and their enhanced NO₂ sensing performance at room temperature.
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DOI：
10.1021/am505949a
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发表时间：
2014-11
影响因子：
9.5
通讯作者：
Wei Yang;Peng Wan;Xiaodong Zhou;Jiming Hu;Y. Guan;Liang Feng
中科院分区：
文献类型：
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作者：
Wei Yang;Peng Wan;Xiaodong Zhou;Jiming Hu;Y. Guan;Liang Feng
在这篇报道中，我们开发了一种无添加剂合成In2O3立方体嵌入石墨烯网络，以InN纳米线（InN- nws）和氧化石墨烯（GO）为前驱体，通过简单的一步微波辅助水热法。在没有氧化石墨烯的情况下，在相同的处理下，InN-NWs保持了其化学成分和原始形态。在不同质量比下，石墨烯薄膜上可以得到不同形貌和分布的In2O3。在In2O3立方体/还原氧化石墨烯（rGO）复合材料中观察到均匀分布，这通常被认为有利于增强传感性能。系统地研究了In2O3立方/氧化石墨烯复合材料传感器的室温NO2传感性能。结果表明，当干扰气体浓度为NO2的1000倍时，该传感器对NO2浓度低至1 ppm的气体有明显的响应，且具有良好的选择性。NO2传感性能的增强是由于在独特的混合结构中均匀分布的In2O3立方体和石墨烯片的协同作用，而没有额外添加剂的干扰。
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.