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Quantum Size Effect in Metal Coated Nanoparticles

Published online by Cambridge University Press:  28 February 2011

H. S. Zhou
Affiliation:
Dept. of Chemical Engineering, Faculty of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113, JAPAN
I. Honma
Affiliation:
Dept. of Chemical Engineering, Faculty of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113, JAPAN
H. Komiyama
Affiliation:
Dept. of Chemical Engineering, Faculty of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113, JAPAN
J. W. Haus
Affiliation:
Physics Dept., Rensselaer Polytechnic Institute, Troy, NY 12180–3590
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Abstract

In this paper we report the synthesis of Au2S nanoparticles with a gold coating on the surface; the particles are characterized by transmission electron microscopy (TEM), electron diffraction and absorption data. The absorption spectrum is recorded during the gold coating growth process; this data demonstrates a large resonance shift during the growth process. The results are consistent with the growth of a metal shell around the particles; the theoretical model includes electron quantum confinement in the metal shell. The size dependence of the frequency shift, as well as the width of the resonance are consistent with the model.

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