IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
Stability of Gold and Platinum Nanowires on Graphite Edges
Autor/es:
G.J. SOLDANO ; P. QUAINO; E. SANTOS; W. SCHMICKLER
Revista:
Chemphyschem
Editorial:
WILEY-V C H VERLAG GMBH
Referencias:
Año: 2010 vol. 11 p. 2361 - 2366
ISSN:
1439-4235
Resumen:
The stability of coinage and noble metal nanowires supported on graphite steps is examined by density functional theory. In particular, we study the stability of supported gold and platinum wires and compare their chemical properties with those of surfaces and bare wires. A substantially stronger bond with graphite was found for platinum wires due to unfilled antibonding states, which are occupied in the case of gold. This difference has direct consequences for the adsorption of hydrogen. This reaction can occur either on the wire or directly on graphite steps. In the case of gold, the reaction is favoured on steps, while on platinum wires, it has no thermodynamical preferences. Our results suggest that, in early stages of wire formation, hydrogen could desorb gold from graphite, but not platinum.