Liu Jinping, Huang Xintang, Sulieman K M, Sun Fenglou, He Xiang
Department of Physics, Central China Normal University, Wuhan 430079, PR China.
J Phys Chem B. 2006 Jun 8;110(22):10612-8. doi: 10.1021/jp056880r.
Self-assembled unusual ZnO ellipsoids have been grown by a facile low-temperature (60 degrees C) solution process on a large scale. FESEM and TEM reveal that these ellipsoids have an average horizontal axis of 1.5 microm and a longitudinal axis of 0.6 microm. Experimental results obtained from the early growth stage demonstrate that the ZnO ellipsoidal structures are single crystals and formed from direct "oriented attachment" of two types of building blocks, that is, nanorods and nanoparticles. It is further found that the existence of poly(ethylene glycol) (PEG-10 000) is vital to the formation of the complex microparticles. Raman spectrum, room-temperature photoluminescence, and UV-vis absorption spectra are also discussed. This work presents a simple and effective route for large-scale fabrication of single-crystal ZnO ellipsoids with micrometer-scale sizes and 3D self-assembled structures.
通过一种简便的低温（60摄氏度）溶液法已大规模生长出自组装的非常规氧化锌椭球体。场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）显示，这些椭球体的平均横轴为1.5微米，纵轴为0.6微米。从早期生长阶段获得的实验结果表明，氧化锌椭球结构是单晶，由两种结构单元即纳米棒和纳米颗粒直接“定向附着”形成。进一步发现聚乙二醇（PEG - 10000）的存在对复合微粒的形成至关重要。还讨论了拉曼光谱、室温光致发光和紫外可见吸收光谱。这项工作为大规模制备具有微米级尺寸和三维自组装结构的单晶氧化锌椭球体提供了一条简单有效的途径。
