Departments of Chemistry, Iowa State University, Ames, IA 50011, USA.
Proc Natl Acad Sci U S A. 2011 Jan 18;108(3):989-94. doi: 10.1073/pnas.1008157107. Epub 2010 Nov 19.
Deposition of metals on binary alloy surfaces offers new possibilities for guiding the formation of functional metal nanostructures. This idea is explored with scanning tunneling microscopy studies and atomistic-level analysis and modeling of nonequilibrium island formation. For Au/NiAl(110), complex monolayer structures are found and compared with the simple fcc(110) bilayer structure recently observed for Ag/NiAl(110). We also consider a more complex codeposition system, (Ni + Al)/NiAl(110), which offers the opportunity for fundamental studies of self-growth of alloys including deviations for equilibrium ordering. A general multisite lattice-gas model framework enables analysis of structure selection and morphological evolution in these systems.
金属在二元合金表面的沉积为引导功能性金属纳米结构的形成提供了新的可能。本研究通过扫描隧道显微镜研究以及对非平衡岛形成的原子级分析和建模来探索这一想法。对于 Au/NiAl(110)，我们发现了复杂的单层结构，并将其与最近观察到的 Ag/NiAl(110)的简单 fcc(110)双层结构进行了比较。我们还考虑了一个更复杂的共沉积系统 (Ni+Al)/NiAl(110)，它为包括偏离平衡有序的合金自生长的基础研究提供了机会。通用的多点格气模型框架能够分析这些系统中的结构选择和形态演变。
