Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, P.R. China.
ACS Appl Mater Interfaces. 2014 Dec 10;6(23):21093-100. doi: 10.1021/am505949a. Epub 2014 Nov 26.
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.
在本报告中，我们开发了一种无添加剂的合成方法，通过简便的一步微波辅助水热法，以 InN 纳米线（InN-NWs）和氧化石墨烯（GO）为前体制备了嵌入石墨烯网络的 In2O3 立方体。在没有 GO 的情况下，InN-NWs 在相同处理条件下保持其化学组成和原始形态。在不同的 InN-NWs 和 GO 质量比下，In2O3 可以在石墨烯片上获得不同的形貌和分布。在 In2O3 立方体/还原氧化石墨烯（rGO）复合材料中观察到均匀的分布，这通常被认为有利于增强传感性能。基于 In2O3 立方体/rGO 复合材料的传感器的室温 NO2 传感性能得到了系统的研究。结果表明，即使在 1000 倍于 NO2 的浓度下，该传感器对浓度低至 1 ppm 的 NO2 气体仍表现出显著的响应和优异的选择性。增强的 NO2 传感性能归因于在独特的混合结构中均匀分布的 In2O3 立方体和石墨烯片之间的协同效应，而没有额外添加剂的干扰。
