The kinetics of phase transitions in underpotentially deposited Cu adlayers on Au(111)

文献信息

发布日期 2000-09-07
DOI 10.1039/B003585H
影响因子 3.676
作者

X. H. Xia, L. Nagle, R. Schuster, O. M. Magnussen, R. J. Behm


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摘要

The formation and phase transitions of underpotentially deposited (√3×√3)R30° and (1×1) Cu adlayers on Au(111) were studied by in-situ STM. Upon a negative potential sweep from the region of a disordered lattice gas into the stability region of the (√3×√3)R30° phase, this structure is formed ia fast homogeneous nucleation and subsequent lateral growth, resulting in a domain wall network which coarsens on a time scale of several minutes. The subsequent transition into a (1×1) phase upon further decreasing the potential occurs ia instantaneous nucleation at the prevailing domain walls of the (√3×√3)R30° and subsequent one-dimensional growth. Hence, this phase transition depends crucially on the history of the sample, i.e., the density of morphological defects in the (√3×√3)R30° adlayer. On the other hand, the mechanism of the reverse transition from the (1×1) to the (√3×√3)R30° phase is determined by the magnitude of the potential step. Small potential steps lead to heterogeneous nucleation at step edges, whereas for large potential steps homogeneous nucleation and growth predominate.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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