期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 20, 期 8, 页码 5636-5643出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp08387d
关键词
-
资金
- DFG
- IDRIS [100170]
The formation of ultrathin copper oxide layers on an Au(111) surface is explored with scanning tunneling microscopy and density functional theory. Depending on the thermal treatment of as-grown Cu-O samples, a variety of thin-film morphologies is observed. Whereas 1D oxide stripes with Au[11 (2) over bar] and Au[1 (1) over bar0] orientation emerge at 450 and 550 K annealing, respectively, a planar (2 x 2) Cu-O network with specific domain structure develops at higher temperature. The latter is ascribed to a Cu3O2 honeycomb lattice with oxygen ions alternatingly located in surface and interface positions. Strain minimization and a thermodynamic preference for Cu-rich edges lead to the formation of structurally well-defined boundaries, delimiting either triangular, elongated or stripe-like Cu3O2 domains. The low-temperature phases compirse complex arrangements of hexagonal and square Cu-O units, similar to those found in Cu2O(111) and (100) surfaces, respectively. The transitions between different thin-film phases are driven by Cu dissolution in the gold crystal and O-2 evaporation and therefore accompanied by a thinning of the oxide layer with increasing temperature.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据