银在有序氧化铝表面的生长。

The growth of silver on an ordered alumina surface.

作者信息

Luo K, Lai X, Yi C-W, Davis K A, Gath K K, Goodman D W

机构信息

Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.

出版信息

J Phys Chem B. 2005 Mar 10;109(9):4064-8. doi: 10.1021/jp045948k.

DOI:10.1021/jp045948k

PMID:16851464

Abstract

The growth of Ag on an ordered Al2O3 surface was studied by low energy ion scattering spectroscopy (LEIS), scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and temperature programmed desorption (TPD). Three-dimensional (3D) growth of Ag clusters was observed with STM and LEIS, with the cluster size increasing with Ag coverage. The XPS core level binding energies and the Auger parameters indicate a weak interaction between the Ag clusters and the Al2O3 support. Final state effects are determined to be the primary contribution to the Ag core level binding energy shift. Nonzero order kinetics was observed for Ag desorption in TPD with the Ag sublimation energy decreasing with decreasing cluster size.

摘要

通过低能离子散射光谱（LEIS）、扫描隧道显微镜（STM）、X射线光电子能谱（XPS）和程序升温脱附（TPD）研究了银在有序氧化铝表面的生长情况。利用STM和LEIS观察到了银团簇的三维（3D）生长，团簇尺寸随银覆盖度的增加而增大。XPS核心能级结合能和俄歇参数表明银团簇与氧化铝载体之间存在弱相互作用。确定终态效应是导致银核心能级结合能位移的主要因素。在TPD中观察到银脱附的非零级动力学，银的升华能随团簇尺寸的减小而降低。