Complexation and Phase Evolution at Dimethylformamide–Ag(111) Interfaces
Complexation and Phase Evolution at Dimethylformamide–Ag(111) Interfaces
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DOI：
10.1021/acs.jpcc.6b06870
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发表时间：
2016-09
影响因子：
3.7
通讯作者：
Wentao Song;K. Leung;Qian Shao;Karen J Gaskell;J. Reutt-Robey
中科院分区：
文献类型：
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作者：
Wentao Song;K. Leung;Qian Shao;Karen J Gaskell;J. Reutt-Robey
溶剂分子与金属表面的相互作用影响许多界面化学过程。我们研究了极性溶剂二甲基甲酰胺（DMF）在Ag（111）表面吸附后的化学和结构演变。通过DMF刻蚀Ag（111）自发形成Ag（DMF）2配位络合物，产生络合物和DMF的混合膜。利用超真空扫描隧道显微镜（UHV-STM），结合X射线光电子能谱（XPS）和密度泛函理论（DFT）的计算，我们映射单层相从2-D的气体制度，组成的二元混合物的DMF和Ag（DMF）2，通过饱和单层的限制，在这两个化学物种相分离成有序的岛屿。提出了近正方形DMF相和链状Ag（DMF）2相的结构模型，并得到了DFT计算的支持。界面演化总结在一个表面压力组成相图，它允许结构预测超过任意example…
The interaction of solvent molecules with metallic surfaces impacts many interfacial chemical processes. We investigate the chemical and structure evolution that follows adsorption of the polar solvent dimethylformamide (DMF) on Ag(111). An Ag(DMF)2 coordination complex forms spontaneously by DMF etching of Ag(111), yielding mixed films of the complexes and DMF. Utilizing ultrahigh vacuum scanning tunneling microscopy (UHV–STM), in combination with X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) computations, we map monolayer phases from the 2-D gas regime, consisting of a binary mixture of DMF and Ag(DMF)2, through the saturation monolayer limit, in which these two chemical species phase separate into ordered islands. Structural models for the near-square DMF phase and the chain-like Ag(DMF)2 phase are presented and supported by DFT computation. Interface evolution is summarized in a surface pressure–composition phase diagram, which allows structure prediction over arbitrary ex...