采用热蒸发和氧化技术制备金属诱导的In2O3纳米塔

利用热蒸发、氧化及金属诱导技术，具有不同截面的大尺度In2O3纳米塔被成功地合成，这些纳米塔的形貌、结构特征与诱导金属的种类（金、银或锡）、衬底和蒸发源的相对位置、生长温度以及气流速率等有较大关系。采用锡作为金属诱导，In2O3纳米塔不能被合成，这说明金属液滴在这些纳米塔的生长初期起到了非常重要的作用。In2O3纳米塔的形成归因于一个竞争性的横向和轴向生长模式，横向生长由气相-固相机理控制，而轴向生长由金属液滴辅助的气体-液体-固体生长机理控制。具有奇异的塔状结构的In2O3纳米塔在光电器件和气体传感器等方面有潜在的应用前景。

Metal-catalyzed growth of In2O3 nanotowers using thermal evaporation and oxidation method

Large-scale In₂O₃ nanotowers with different cross sections were synthesized by a thermal evaporation and oxidation technique using metal as the catalyst. The morphologies and structural characterizations of In₂O₃ nanotowers are dependent on growth processes, such as different metal(Au, Ag or Sn) catalysts, the relative position of the substrate and evaporation source, growth temperature, gas flow rate, and growth time. In₂O₃ nanotowers cannot be observed using Sn as the catalyst, which indicates that metal liquid droplets play an important role in the initial stages of the growth of In₂O₃ nanotowers. The formation of an In₂O₃ nanotower is attributed to the competitive growth model between a lateral growth controlled by vapor-solid mechanism and an axial vapor-liquid-solid growth mechanism mediated by metal liquid nanodroplets. The synthesized In₂O₃ nanostructures with novel tower-shaped morphology may have potential applications in optoelectronic devices and gas sensors.