Jun Young-wook, Lee Jae-Hyun, Choi Jin-sil, Cheon Jinwoo
Department of Chemistry and Nano-Medical National Core Research Center (NCRC), Yonsei University, Seoul 120-749, Korea.
J Phys Chem B. 2005 Aug 11;109(31):14795-806. doi: 10.1021/jp052257v.
Since inorganic nanocrystals exhibit unique shape-dependent nanoscale properties and can be utilized as basic building blocks for futuristic nanodevices, a systematic study on the shape control of these nanocrystals remains an important subject in materials and physical chemistry. In this feature article, we overview the recent progress on the synthetic development of symmetry-controlled colloidal nanocrystals of semiconductor and metal oxide, which are prepared through nonhydrolytic chemical routes. We describe their shape-guiding processes and illustrate the detailed key factors controlling their growth by examining various case studies of zero-dimensional spheres and cubes, one-dimensional rods, and quasi multidimensional structures such as disks, multipods, and stars. Specifically, the crystalline phase of nucleating seeds, surface energy, kinetic vs thermodynamic growth, and selective adhesion processes of capping ligands are found to be most crucial for the determination of the nanocrystal shape.
由于无机纳米晶体展现出独特的形状依赖型纳米级特性，并且能够用作未来纳米器件的基本构建单元，因此对这些纳米晶体形状控制的系统研究仍然是材料科学和物理化学领域的一个重要课题。在这篇专题文章中，我们概述了通过非水解化学路线制备的半导体和金属氧化物对称控制胶体纳米晶体合成发展的最新进展。我们描述了它们的形状引导过程，并通过研究零维球体和立方体、一维棒以及准多维结构（如圆盘、多足体和星形）的各种案例，阐明了控制其生长的详细关键因素。具体而言，成核种子的晶相、表面能、动力学与热力学生长以及封端配体的选择性粘附过程被发现对于确定纳米晶体形状最为关键。
