Coexistance of Cu and Ag in surface nano-structure and the new behavior of glycine adsorption on silver surfaces

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Coexistance of Cu and Ag in surface nano-structure and the new behavior of glycine adsorption on silver surfaces

Ge Si-Ping , Zhu Xing , Yang Wei-Sheng

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Coexistance of Cu and Ag in surface nano-structure and the new behavior of glycine adsorption on silver surfaces

Ge Si-Ping, Zhu Xing, Yang Wei-Sheng

Acta Phys. Sin., 2004, 53(10): 3447-3452.

doi: 10.7498/aps.53.3447

Abstract
Novel properties of surfaces with heteronanostructures are of considerable interest in recent years. Although glycine can only be physisorbed on pure sil ver surfaces, our recent results show that monolayersilver islands deposited o n copper surfaces, with the help from the nearby nude copper surface areas, have the ability of chemisorption of glycine. In the present study we find that, on the other way round, copper islands deposited on the Ag(111) surface can also ma ke glycine being chemisorbed on the nude silver areas, although in the latter ca se the surface of a silver bulk is involved. This result demonstrates that it is the nanocoexistance of Cu and Ag on the surface, rather than any specific str ucture of the coexistance, that gives rise to the novel chemical property of the silver surfaces. Furthermore, we also find that all deposited copper islands will gradually be covered by a monolayer of Ag atoms, even at the room temperature , and thus lose the ability of helping the silver surface to gain the novel chem ical property. This indicates that in order to take advantage of the novel prope rties of heteronanostructures, we have to consider their longterm stabilit y and very often it is possible to choose the stable ones.

Keywords:
spillover /

glycine /

copper /

Ag(111)
Authors and contacts
Ge Si-Ping,

Zhu Xing,

Yang Wei-Sheng

1.
北京大学物理学院，人工微结构与介观物理国家重点实验室,北京 100871
References

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Vol. 53, Issue 10 - 2004-05-20

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