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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
 
Creator ETHAYARAJA, M
BANDYOPADHYAYA, R
 
Subject coated semiconductor nanoparticles
cation-exchange
nanocrystals
systems
 
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.
 
Publisher AMER CHEMICAL SOC
 
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
 
Type Article
 
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
 
Language en