铟颗粒上具有不同直径氧化铟纳米锥的原位合成与光致发光特性

以Au作催化剂, 通过金属铟与氧气在850～1000 ℃的氧化反应, 在单质铟表面原位大面积生长出了In2O3纳米锥. 通过反应温度的改变实现了纳米锥的可控合成. 采用激光拉曼光谱、X射线衍射、扫描电镜和透射电镜对产物进行了表征分析. 结果表明, 纳米锥为立方相单晶结构的In2O3, 其直径和高度分别在0.1～0.6 μm和0.2～2.9 μm范围内可调控. 提出了In2O3纳米锥可能的生长机理. 在室温下研究了它们的发光性质, 发现了发光峰位于416和439 nm强的蓝光发光, 这一蓝光发光起源于氧化铟纳米锥中氧空位中的电子与铟-氧空位中心中的空穴之间的复合.

In situ Synthesis and Photoluminescence Properties of In2O3 Nanocones with Different Diameters on the Surface of Indium Grains

In2O3 nanocones have been in situ grown on the surface of indium substrates by heating indium grains coated with Au films in 850～1000 ℃ under the flow of O2. The controllable synthesis of In2O3 nanocones with different diameters was achieved by adjusting the heating temperature. The as-synthesized products were characterized by means of Raman spectra, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that the In2O3 nanocones are of single crystalline phase with a body-center cubic structure and have a controllable diameter and length in the range of 0.1～0.6 and 0.2～2.9 μm, respectively. A possible mechanism was also proposed to account for the formation of the In2O3 nanocones. A strong blue photoluminescence with peaks at 416 and 439 nm was observed in the In2O3 nanocones at room temperature. The 416 and 439 nm blue emission was attributed to radiative recombination between an electron on an oxygen vacancy and a hole on an indium-oxygen vacancy center in the In2O3 nanocones.