| Autor: |
M L Sushko, A Y Gal, M Watkins, A L Shluger |
| Předmět: |
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| Zdroj: |
Nanotechnology; Apr2006, Vol. 17 Issue 8, p2062-2072, 11p |
| Abstrakt: |
We have modelled NC-AFM imaging of organic molecules adsorbed on the MgO(100) andTiO2(110) surfaces, to study whether molecules adsorbed at well determined surface sites could serve asmarkers for chemical resolution of surface species and possible mechanisms of adsorption andmanipulation of such molecules with NC-AFM tips. We calculated images of perfect MgO andTiO2 surfaces and considered the adsorption of the formate ion and3-{4-[Tris-(3,5-di-tert-butyl-phenyl)-methyl]-phenoxy}-propionic acid(C52H72O3) at theMgO(100) and TiO2(110) surfaces, respectively, using several types of oxide tip models. The results demonstrate thatusing adsorption of even small molecules, such as formate, for identifying surface chemicalspecies in NC-AFM images may not be practical. The interaction of hydrocarbon moleculeswith perfect oxide surfaces is weak and their adsorption should be aided by attachingspecial anchoring groups. Flat molecules can be identified by their shape, but simultaneousatomic resolution inside the molecule and on the substrate under the same imagingconditions is not feasible. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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