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Growth and characterization of semiconductor nanoparticles in porous sol-gel films

Published online by Cambridge University Press:  31 January 2011

E. J. C. Dawnay
Affiliation:
Department of Electrical and Electronic Engineering, Imperial College, London SW7 2BT, England
M. A. Fardad
Affiliation:
Department of Electrical and Electronic Engineering, Imperial College, London SW7 2BT, England
Mino Green
Affiliation:
Department of Electrical and Electronic Engineering, Imperial College, London SW7 2BT, England
E. M. Yeatman
Affiliation:
Department of Electrical and Electronic Engineering, Imperial College, London SW7 2BT, England
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Abstract

Two methods for the preparation of semiconductor doped sol-gel films, for applications in nonlinear optics, have been studied and compared. In the first, porous films are spun from sols containing the cation precursor, and then reacted with H2S gas, and in the second, the cation is adsorbed onto the pore surfaces of passive films from aqueous solution before the gas reaction. Extensive results for CdS doping are given, and preliminary results are reported for other semiconductor species. It is shown that a sputtered silica layer can seal the structure to allow further heat treatment without loss of dopant. The effects of heat treatment of doped films are described, and the limitation of crystallite growth by pore size is shown.

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Articles
Copyright
Copyright © Materials Research Society 1997

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