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Optical properties of nanosized gold particles

Published online by Cambridge University Press:  31 January 2011

Robert H. Doremus  and
Pratima Rao
Robert H. Doremus
Affiliation:
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York12180–3590
Pratima Rao
Affiliation:
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York12180–3590
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Abstract

Gold particles smaller than 2 nm in diameter were grown in glass. Their optical absorption spectrum did not show the usual plasma absorption band for gold particles; this band was spread by the small particle size. The absorption spectrum was calculated from the bulk optical properties of gold, modified for the small particle size; there was good agreement between calculated and measured spectra. The smallest particles containing from 20 to 40 gold atoms showed a λ−4 dependence of absorption on wavelength λ. This result implies that the absorption in these particles was entirely from free electrons at wavelengths above 0.3 μm.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 11 , November 1996 , pp. 2834 - 2840
Copyright
Copyright © Materials Research Society 1996

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