Pal U, Santiago P
Instituto de Física, Universidad Autónoma de Puebla, Apdo. Postal J-48, Puebla, Pue. 72570, Mexico.
J Phys Chem B. 2005 Aug 18;109(32):15317-21. doi: 10.1021/jp052496i.
ZnO nanostructures of different morphologies were grown in a controlled manner using a simple low-temperature hydrothermal technique. Controlling the content of ethylenediamine (soft surfactant) and the pH of the reaction mixture, nanoparticles, nanorods, and flowerlike ZnO structures could be synthesized at temperatures 80-100 degrees C with excellent reproducibility. High-resolution electron microscopy revealed the well crystalline nature of all the nanostructures with preferential growth along the [002] direction for linear structures. Photoluminescence spectra of the as-grown nanostructures revealed oxygen-vacancy-related defects in them, which could be reduced by air annealing at 250 degrees C. Possible mechanisms for the variation of morphology with synthesis parameters are discussed.
采用简单的低温水热技术以可控方式生长了不同形貌的氧化锌纳米结构。通过控制乙二胺（软表面活性剂）的含量和反应混合物的pH值，可在80 - 100摄氏度的温度下合成纳米颗粒、纳米棒和花状氧化锌结构，且具有出色的可重复性。高分辨率电子显微镜显示所有纳米结构具有良好的结晶性质，对于线性结构沿[002]方向优先生长。所生长纳米结构的光致发光光谱显示其中存在与氧空位相关的缺陷，通过在250摄氏度下进行空气退火可减少这些缺陷。讨论了形貌随合成参数变化的可能机制。
