Viswanatha , Ranjani and Amenitsch, Heinz and Sarma, D. D (2007) Growth Kinetics of ZnO Nanocrystals: A Few Surprises. Journal of the American Chemical Society, 129 (14). pp. 4470-4475.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/ja068161b
Using extensive state-of-the-art experiments over a wide range of synthesis parameters, such as the temperature and concentrations of different reactants, we establish qualitatively different growth kinetics for ZnO nanocrystals compared to all growth kinetics of semiconductor nanocrystals, including ZnO, discussed so far in the literature. The growth rate is shown to be strongly dependent on the concentration of (OH)- in an intriguing nonmonotonic manner as well as on temperature and is almost invariably much slower than well-known and generally accepted growth mechanisms based on a diffusion-controlled Ostwald ripening process or that expected in the surface reaction controlled regime. We show that these qualitatively different results arise from the unexpected role played by a part of the reactants by inhibiting rather than facilitating the reaction; we explain this extraordinary result in terms of an effective passivating layer around the growing nanocrystals formed by a virtual capping shell of Na+ ions.
|Subjects:||Material Science > Nanochemistry|
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Chemistry|
|Deposited On:||27 Jan 2009 09:59|
|Last Modified:||27 Jan 2009 09:59|
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