Spatially (nanometer) controlled hydrogenation and oxidation of carbonaceous clusters by the platinum tip of a scanning tunneling microscope operating inside a reactor cell

Autor:	McIntyre, B. J., Salmeron, M., Somorjai, G. A.
Zdroj:	Catalysis Letters; March 1996, Vol. 39 Issue: 1-2 p5-17, 13p
Abstrakt:	Hydrocarbon clusters formed by the thermal decomposition of propylene on Pt(111) were rehydrogenated or oxidized with nanometer spatial resolution using the platinum tip of a scanning tunneling microscope (STM) at 300 K in atmospheric pressures of H2 or O2. The reaction rate shows a strong dependence on the oxygen or hydrogen pressures and on the tip-surface separation. The reaction stops when the Pt tip becomes contaminated with carbon, after the removal of ~107–108 carbon atoms, but can be regenerated by removing material from the tip by application of a voltage pulse. Dissociative adsorption of H2 and O2 on the tip, followed by transfer of atoms to the surface is the proposed mechanism of these tip-catalyzed reactions.
Databáze:	Supplemental Index
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