Bimodal growth of Au on SrTiO3(001)

被引：65
|
作者：
Silly, F [1 ]
Castell, MR [1 ]
机构：
[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.96.086104
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have investigated the vapor phase growth of Au on SrTiO3(001)-(2x1) substrates by UHV scanning tunneling microscopy. Submonolayer (ML) coverages below 300 degrees C wet the surface as disordered metastable 2D islands. Beyond 0.75 ML fcc nanocrystals with a (111) interface are nucleated and ripen by dewetting the surrounding layer. Some multiply twinned fivefold symmetric clusters are also created. Above 400 degrees C dewetting occurs for all coverages and the surface is only populated by nanocrystals and fivefold clusters. A planar ground state configuration for small Au clusters and a higher interface energy for crystals than for wetted 2D ML films explains these results.
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页码：1 / 4
页数：4
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