Growth and Ag-encapsulation of Pt islands on Ag(111) at room temperature

被引：0
|
作者：
Gedara, Buddhika S. A. [1 ]
Trenary, Michael [1 ]
机构：
[1] Univ Illinois, Dept Chem, 845 West Taylor St, Chicago, IL 60607 USA
来源：
SURFACE SCIENCE | 2025年 / 751卷
基金：
美国国家科学基金会;
关键词：
Scanning tunneling microscopy; Two-dimensional island nucleation and growth; Silver; Encapsulation of platinum islands; Platinum deposition on Ag(111); CRITICAL CLUSTER-SIZE; EPITAXIAL-GROWTH; NUCLEATION; EXCHANGE; SURFACE; MECHANISMS; MORPHOLOGY; STM;
D O I：
10.1016/j.susc.2024.122608
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：
The growth of Pt islands at submonolayer coverages on Ag(111) at room temperature were investigated with scanning tunneling microscopy. A two-step mechanism for growth of the islands is proposed. First, Pt replaces Ag substrate atoms through a place-exchange process. Next, Pt adatoms nucleate at substitutional Pt sites and Pt islands subsequently grow from these sites. At room temperature, Ag atoms migrate to cover Pt islands, creating vacancy pits on the terraces and bays on the step edges. Ag atoms nucleate at corner sites of the Pt islands, and the layer of Ag atoms on the Pt islands grow from these sites.
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页数：6
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