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CdS-ZnS core-shell nanoparticle formation: Experiment, mechanism, and simulation

Ethayaraja, Mani and Ravikumar, Chettiannan and Muthukumaran, Devarajan and Dutta, Kanchan and Bandyopadhyaya, Rajdip (2007) CdS-ZnS core-shell nanoparticle formation: Experiment, mechanism, and simulation. JOURNAL OF PHYSICAL CHEMISTRY C, 111 (8). pp. 3246-3252.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp066066j

Abstract

CdS-ZnS core-shell nanoparticles are synthesized in a series of water-in-oil microemulsion solutions with increasing microemulsion drop sizes. Shell formation was confirmed by observation of a red shift in the UV-vis absorption spectra. Nanoparticle diameter and shell thickness estimated independently from the spectra and from mass balance approximation are consistent with each other. A new two-stage mechanism of coreshell nanoparticle formation has been developed from the experimental findings that consists of coalescence-exchange of microemulsion drops with nucleation, growth, and coagulation of particles. Quantitative predictions from Monte Carlo simulation of this mechanism compares well with the temporal evolution of experimental mean nanoparticle diameter and shell thickness for most of the cases, except when the nature of water in the microemulsion drops is different from bulk water for very small drop size. An increase in both the core and core-shell nanoparticle diameter with drop size reflects the control of the microemulsion template structure on nanoparticle synthesis.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Material Science > Nanofabrication processes and tools
ID Code:3523
Deposited By:Farnush Anwar
Deposited On:16 Jan 2009 14:56
Last Modified:29 Jan 2009 11:26

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