STM study of Au growth on S-modified Ru(0001)

被引:15
作者
Hrbek, J
Schmid, AK
Bartelt, MC
Hwang, RQ
机构
[1] SANDIA NATL LABS, SURFACE CHEM DEPT, LIVERMORE, CA 94550 USA
[2] BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA
关键词
Auger electron spectroscopy; chemisorption; epitaxy; gold; growth; nucleation; ruthenium; scanning tunneling microscopy; sulfur; surface diffusion; surface segregation;
D O I
10.1016/S0039-6028(97)00433-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present results of a detailed scanning tunneling microscopy (STM) study of submonolayer nucleation and growth of two-dimensional Au islands during deposition on clean versus S-precovered Ru(0001), at room temperature. In the presence of tiny amounts of S, a dramatic increase in the mean island densities is observed, corresponding to a decrease in the effective mobility of Au on Ru(0001). As imaged also by STM, the structure of the S adlayer changes during Au deposition, from a dilute lattice-gas, at low Au coverages, to an increasingly denser sequence of ordered superstructure p(2 x 2), (root 3 x root 3-R30 degrees) and c(2 x 4) domains, with increasing Au coverage. These findings suggest that the deposited Au atoms displace S adatoms, compressing S domains, a phenomenon consistent with a net repulsive interaction between neighboring Au and S mediated by the Ru substrate. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:L1002 / L1009
页数:8
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