Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)

O 36.71: Poster

Montag, 7. März 2005, 15:00–18:00, Poster TU F

Growth and properties of Ag nanoparticles on HOPG — •Ignacio Lopez-Salido, Dong Chan Lim, Tim Fischer, Rainer Dietsche, Felix v. Gynz-Rekowski, and Young Dok Kim — Department of Physics, University of Konstanz, D.78457, Konstanz, Germany

Growth of Ag nanoparticles on Highly Oriented Pyrolytic Graphite (HOPG) surfaces were studied using Scanning Tunneling Microscopy (STM). The Ag particles show quite narrow size distributions on the HOPG surface, and the particle sizes can be controlled using variation of Ag coverage. Detailed analysis of the STM images reveals that Ag nanoparticles grow three-dimensionally from the initial stage of the particle growth, and no significant changes in the ratio of the particle height and width can be observed as a function of particle size. This result is quite in contrast to those of Ag on other van der Waals surfaces such as Wse2, on which Ag prefers two-dimensional growth above a certain particle size, indicating that small changes in metal-support interactions can alter the particle shape significantly. Due to the extremely weak metal support interactions of this system, information of intrinsic size effects of Ag nanoparticles on electronic and chemical properties can be obtained. High-Resolution Electron Energy Loss Spectroscopy and core level shift data show significant alteration of the electronic and chemical properties of Ag nanoparticles as a function of particle size.