ISSN:
1572-879X
Schlagwort(e):
catalysis
;
nanofabrication
;
STM
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract 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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00813723
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