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Coalescence kinetics of copper clusters on highly oriented pyrolytic graphite and Dow Cyclotene, as determined by x-ray photoelectron spectroscopy

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2 Author(s)
Yang, D.-Q. ; Groupe des Couches Minces andDépartment de Génie Physique École Polytechnique, C.P. 6079, succursale Center-Ville, Montréal, Québec H3C 3A7, Canada ; Sacher, E.

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Copper clusters, deposited by evaporation onto highly oriented pyrolytic graphite (HOPG) and Dow Cyclotene, a low permittivity polymer, have been found to coalesce through surface diffusion at room temperature. We study this process by x-ray photoelectron spectroscopy under ultrahigh vacuum conditions, where cluster growth was measured through photoelectron emission intensity changes. Using a simple model, the coalescence (as opposed to diffusion) coefficients were determined for both untreated and Ar+-treated substrates. It was found that Ar+ treatment results in reductions in both coalescence coefficient and cluster size due to increased cluster/surface interaction. The atypical coalescence behavior of Cu on untreated HOPG is shown to be due to an absence of interfacial interaction. © 2001 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:90 ,  Issue: 9 )