Lifting of the Au(100) surface reconstruction by Pt, Cr, Fe, and Cu adsorption
| Autor: | Daniel Skomski, Steven L. Tait, Christopher D. Tempas |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Metal Adsorption X-ray photoelectron spectroscopy law Materials Chemistry Bimetallic strip Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics Copper 0104 chemical sciences Surfaces Coatings and Films Crystallography chemistry visual_art visual_art.visual_art_medium Scanning tunneling microscope 0210 nano-technology Platinum Surface reconstruction |
| Zdroj: | Surface Science. 654:33-38 |
| ISSN: | 0039-6028 |
| Popis: | The adsorption and growth of metals on the surfaces of other metals is an important topic for studies of heterogeneous catalysis and bimetallic nanoparticles. The surface structure of these systems impacts nanoparticle growth, catalytic activity, and reaction selectivity. In these experiments, platinum, chromium, iron, or copper were vapor deposited on the reconstructed Au(100) surface. The initial growth of each metal was studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Each of the four metals forms anisotropic rectangular islands oriented in the direction of the gold reconstruction rows. The gradual lifting of the surface reconstruction by increased metal coverage is observed, and the reconstruction is fully lifted after 0.5 ML of Pt, Cr, or Fe, or by 3.3 ML of Cu. After the reconstruction is lifted, the island shape changes from rectangular to square, illustrating the effect of surface structure on growth. Second layer islands begin to form before the completion of the first full layer. |
| Databáze: | OpenAIRE |
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