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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.

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

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