Applied Physics, School of Applied Sciences, RMIT University, GPO Box 2476, Melbourne VIC 3001, Australia.
J Phys Condens Matter. 2011 Jan 12;23(1):015302. doi: 10.1088/0953-8984/23/1/015302. Epub 2010 Dec 6.
Pt-decorated Au nanostructures and bimetallic PtAu nanoparticles have been shown to act as catalysts. Consequently we investigate the formation of extended Pt decorations of an Au island edge on Au(111) as possible catalysts. The investigation is by simulation using the kinetic Monte Carlo method. The effects of varying the rate of deposition of Pt atoms and the simulation temperature on the morphology of the resulting Pt nanostructures were investigated. The thickness and roughness of the nanostructures are readily influenced, with temperature being the more important factor. A combination of both high temperature and low deposition rate was the most effective at reducing the roughness. PtAu alloying in the Au island edge was identified. This work is (to the best of our knowledge) the first kinetic Monte Carlo simulation study of the formation of Pt nanostructures on Au. We demonstrate how the morphology of the Pt nanostructures can be controlled. The nanostructures studied here, comprising an adjustable mix of Pt overlayers and novel 1D PtAu surface alloys, are expected to be of considerable interest as potential bimetallic nano-catalysts.
Pt 修饰的 Au 纳米结构和双金属 PtAu 纳米颗粒已被证明具有催化作用。因此，我们研究了 Au(111)上 Au 岛边缘的扩展 Pt 修饰作为可能的催化剂的形成。这项研究是通过使用动力学蒙特卡罗方法进行模拟的。研究了改变 Pt 原子沉积速率和模拟温度对所得 Pt 纳米结构形态的影响。纳米结构的厚度和粗糙度很容易受到影响，温度是更重要的因素。高温和低沉积速率的组合在降低粗糙度方面最有效。在 Au 岛边缘发现了 PtAu 合金化。这项工作（据我们所知）是首次对 Au 上 Pt 纳米结构形成的动力学蒙特卡罗模拟研究。我们展示了如何控制 Pt 纳米结构的形态。这里研究的纳米结构，包括可调的 Pt 覆盖层和新型一维 PtAu 表面合金，预计作为潜在的双金属纳米催化剂将具有相当大的兴趣。
