Plasticity-induced oxidation reactivity on Ni(100) studied by scanning tunneling spectroscopy
| Autor: | Bilge Yildiz, K. J. Van Vliet, F.W. Herbert |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Local density of states Fermi level Scanning tunneling spectroscopy Analytical chemistry Context (language use) Electronic structure law.invention Condensed Matter::Materials Science symbols.namesake Chemical physics law symbols General Materials Science Scanning tunneling microscope Deformation (engineering) Dislocation |
| Zdroj: | MRS Communications. 2:23-27 |
| ISSN: | 2159-6867 2159-6859 |
| DOI: | 10.1557/mrc.2011.17 |
| Popis: | Using in situ indentation, we show that highly localized and well-defined mechanical deformation can be coupled with structural and electronic characterization in the scanning tunneling microscope. Dislocations induced in Ni(100) were topographically imaged and probed by scanning tunneling spectroscopy to assess their effect on local surface electronic structure. Compared with undamaged terraces, dislocation regions exhibited a significant increase in local density of states near the Fermi level, and enhanced reactivity toward oxidation. In the context of the d-band electronic structure model, we suggest that the undercoordination of atoms and residual strain resulting from plastic deformation serve to locally accelerate adsorption-driven chemical reactions with species such as molecular oxygen. |
| Databáze: | OpenAIRE |
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