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Kinetics and Mechanism of Nucleation, Growth and Stabilization of Metal Oxide Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Rina Tannenbaum ,
Scott King ,
K. Hyunh ,
Melissa Zubris  and
Nily Dan
Rina Tannenbaum*
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, GA
Scott King
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, GA
K. Hyunh
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN
Melissa Zubris
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, GA
Nily Dan
Affiliation:
Department of Chemical Engineering, Drexel University, Philadelphia, PA.
*
*[email protected]
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Abstract

Reactive metallic fragments that are formed by the decomposition of organometallic complexes, undergo a nucleation and growth process that gives rise to the formation of nanocrystals. In the absence of stabilizing molecules, the aggregation process is restricted mainly due to the decreasing mobility of the particles and their declining diffusional rates as a function of their increasing size. On the other hand, in the presence of a polymer in the reaction medium, the growing metallic particles are stabilized by the surface adsorption of the polymer chains, thus lowering their surface energy and creating a barrier to further aggregation. Studies of the nucleation and aggregation kinetics of metallic particles formed from the decomposition of organometallic precursors have been used to shed light on the mechanism of their formation. In these studies, the rate of decomposition of the precursor organometallic complexes used has been considered to represent the overall rate of the process. Moreover, it has been implicitly assumed that the formation kinetics of the metal nanoclusters directly coincides with the decomposition kinetics of their precursors. In this study, we attempt to decouple the kinetic characteristics of the various steps that comprise the overall nucleation and aggregation process cobalt oxide nanoclusters. A combination of infrared and x-ray photoelectron spectroscopies, and particle size determination by dynamic light scattering, are used to identify the individual contribution of each step to the overall mechanism of metal nanocluster formation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 788: Symposium L – Continuous Nanophase and Nanostructured Materials , 2003 , L10.1
Copyright
Copyright © Materials Research Society 2004

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References

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