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Growth Kinetics of Quantum Size ZnO Particles

Published online by Cambridge University Press:  09 August 2011

E. M. Wong ,
J. E. Bonevich  and
P. C. Searson
E. M. Wong
Affiliation:
MSE Department, The Johns Hopkins University, Baltimore, MD 21218
J. E. Bonevich
Affiliation:
Metallurgy Division, NIST, Gaithersburg, MD 20889
P. C. Searson
Affiliation:
MSE Department, The Johns Hopkins University, Baltimore, MD 21218
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Abstract

Colloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. The particle aging kinetics were determined by monitoring the optical band edge absorption and using the effective mass model to approximate the particle size as a function of time. We show that the growth kinetics of the ZnO particles follow the Lifshitz, Slyozov, Wagner theory for Ostwald ripening. In this model, the higher curvature and hence chemical potential of smaller particles provides a driving force for dissolution. The larger particles continue to grow by diffusion limited transport of species dissolved in solution. Thin films were fabricated by constant current electrophoretic deposition (EPD) of the ZnO quantum particles from these colloidal suspensions. All the films exhibited a blue shift relative to the characteristic green emission associated with bulk ZnO. The optical characteristics of the particles in the colloidal suspensions were found to translate to the films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 536: Symposium F – Microcrystalline & Nanocrystalline Semiconductors - 1998 , 1998 , 347
Copyright
Copyright © Materials Research Society 1999

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