Metastable Phase of the Au(111) Surface in Electrolyte Revealed by STM and Asymmetric Potential Pulse Perturbation
Metastable Phase of the Au(111) Surface in Electrolyte Revealed by STM and Asymmetric Potential Pulse Perturbation
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STM 和不对称电势脉冲扰动揭示电解质中 Au(111) 表面的亚稳态相
DOI：
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发表时间：
2011
期刊：
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通讯作者：
E. Borguet
中科院分区：
文献类型：
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作者：
Yufan He;E. Borguet
We report, for the first time, a new phase of the Au(111) surface that is different from the well-known reconstructed (22 × √3) and the unreconstructed (1 × 1) states. This new metastable phase is characterized by a high density of highly mobile atoms, the absence of islands, and a paucity of reconstruction stripes. This phase results from the lifting of the reconstruction in the 0.1 M HClO4 interface that is induced by an asymmetric potential pulse perturbation and observed as the potential is stepped down, into the range from 0.3 to 0.45 VSCE, where the potential is neither high enough to form a stable unreconstructed Au(111)-(1 × 1) with islands nor low enough to form stable reconstructed Au(111)-(22 × √3) stripes. Our experiments demonstrate that the reconstruction process can be independent from Au island decay. Furthermore, we discovered that the formation of the (22 × √3) phase from the metastable phase is a fast process, which indicates that previous reports of slow Au(111) reconstruction, i.e., (...
