Complexation and Phase Evolution at Dimethylformamide–Ag(111) Interfaces
| Autor: | Kevin Leung, Karen J. Gaskell, Wentao Song, Qian Shao, Janice Reutt-Robey |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Coordination complex chemistry.chemical_compound General Energy chemistry X-ray photoelectron spectroscopy Phase (matter) Monolayer Physical chemistry Dimethylformamide Molecule Density functional theory Physical and Theoretical Chemistry 0210 nano-technology Phase diagram |
| Zdroj: | The Journal of Physical Chemistry C. 120:22979-22988 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b06870 |
| Popis: | 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... |
| Databáze: | OpenAIRE |
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