Structural Studies of Small Particles and Surfaces

9529453标记 首席研究员过去的研究表明，生长在硅（001）表面上的小银颗粒不是单晶，而是各种不同的形态，包括多孪晶颗粒。 本项目更详细地研究了在真空条件下生长在硅和锗表面上的小颗粒的结构。 在1 - 20nm的尺寸范围内研究了这些颗粒的内部和表面结构。 主要的实验技术是高分辨率 电子显微镜下 真空条件加上更传统的表面科学探测器。 要探讨的一个问题是在统计意义上发生在混合形态生长系统中的颗粒类型。 %小 颗粒 发挥 一个 重要 作用 在 许多技术 重要 过程， 为 例如多相催化，许多薄膜的初始生长 系统，最近在纳米材料和量子点领域。 该计划检查结构和相关杂质的影响方面。 ***

9529453 Marks Past research by the principal investigator has shown that small particles of silver grown on silicon (001) surfaces are not single crystals, but instead a variety of different morphologies including multiple-twinned particles. This project examines in more detail the structure of small particles grown on silicon and germanium surfaces under ultrahigh vacuum conditions. The structure, both internal and surface of these particles, is studied in the size range of 1-20nm. The primary experimental technique is high resolution electron microscopy under ultrahigh vacuum conditions coupled with more conventional surface science probes. A question to be explored is the type of particles in a statistical sense that occur in mixed morphology growth systems. %%% Small particles play an important role in many technologically important processes, for instance heterogeneous catalysis, the initial growth of many thin film systems, and recently in the area of nanophase materials and quantum dots. This program examines aspects of structure and related impurity effects. ***