Model for core-shell nanoparticle formation by ion-exchange mechanism
DSpace at IIT Bombay
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Title |
Model for core-shell nanoparticle formation by ion-exchange mechanism
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Creator |
ETHAYARAJA, M
BANDYOPADHYAYA, R |
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Subject |
coated semiconductor nanoparticles
cation-exchange nanocrystals systems |
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Description |
Core-shell nanoparticles can be synthesized by partial exchange of the cation of the core nanoparticles by a second cation of the desired shell compound. Process time and cation concentration can be varied to control the thickness of the shell. A mathematical model is presented that describes the process of ion-exchange from preformed spherical nanoparticles. The overall process consists of diffusion of the cation from the solution to the core - nanoparticle surface, then solid-state diffusion of the cation across the shell, and finally the cation exchange reaction. We find that the second step of diffusion in the shell is rate-controlling. Our model compares well with the available experimental data of CdS-PbS core-shell nanoparticle formation at various [Ph2+]/[Cd2+] molar ratios and at different process times. The model can be useful for a priori specification of experimental conditions required for a desired shell thickness.
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Publisher |
AMER CHEMICAL SOC
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Date |
2011-07-14T12:42:24Z
2011-12-26T12:48:23Z 2011-12-27T05:35:34Z 2011-07-14T12:42:24Z 2011-12-26T12:48:23Z 2011-12-27T05:35:34Z 2008 |
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Type |
Article
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Identifier |
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 47(16), 5982-5985
0888-5885 http://dx.doi.org/10.1021/ie0715106 http://dspace.library.iitb.ac.in/xmlui/handle/10054/3955 http://hdl.handle.net/10054/3955 |
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Language |
en
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