利用水热法，在没有表面活性剂和有机溶剂的情况下，在一定pH值下合成In(OH)3微米立方。通过在400℃煅烧In(OH)3前驱体，制备In2O3微米立方。所制备的In2O3保持In(OH)3微米立方的结构和形貌，但在煅烧中，由于脱水， In2O3微米立方有轻微的变形。采用X射线衍射仪、扫描电镜和热重分析对所制备样品的相成分、形貌和热性能进行表征。在最佳工作温度275℃下，评估In2O3微米立方对H2、CO、CH4、C2H5OH和CO2的气敏性能。测试结果表明， In2O3微米立方对C2H5OH有良好的气敏性能。最后，对In2O3微米立方的敏感机理进行讨论，可知In2O3微米立方除了作为气敏材料，也可用于微电子和光电子器件材料。
In(OH)3 microcubes were synthesized with a hydrothermal process at a certain pH value without any surfactant and organic agents.By annealing as-prepared In(OH)3 precursors at 400 ℃ in air,we obtained In2 O3 microcube that inherited the morphologies of their precursors.The resulting In2 O3 still slightly distorted due to the dehydration process of In(OH)3 .The phase compositions,morphologies and thermal properties of the syn-thesized samples were characterized by powder X-ray diffraction,scanning electron microscopy and thermo-gravimetric analysis.The gas sensing performance of In2 O3 microcubes toward H2 ,CO,CH4 ,C2 H5OH,CO2 was evaluated at optimal working temperature of 275 ℃.The results revealed that the In2 O3 nanocubes exhibi-ted excellent gas-sensing properties for C2 H5OH.The sensing mechanism of the In2 O3 microcube sensors was discussed.These uniform microcubes may also be useful in microelectronic and optoelectronic devices.
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