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CdS/ZnS core–shell nanoparticles in arachidic acid LB films

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Field Value
 
Title CdS/ZnS core–shell nanoparticles in arachidic acid LB films
 
Creator MANDAL, P
SRINIVASA, RS
TALWAR, SS
MAJOR, SS
 
Subject absorption spectra
electron diffraction
photoluminescence
blodgett films
 
Description Core–shell CdS/ZnS nanoparticles in arachidic acid film were prepared through a novel Langmuir–Blodgett (LB) approach. Post-deposition treatment of the precursor LB multilayers of cadmium arachidate with H2S gas followed by intercalation of Zn2+ ions and further sulfidation result in the formation of CdS/ZnS nanoparticles in the LB film. The formation of these nanoparticles and resulting changes in layered structures were studied by FTIR and X-ray reflection measurements. The optical properties were studied using UV–vis absorption and photoluminescence spectroscopy. A red-shift in the absorption spectrum and enhancement of CdS excitonic emission together with reduction of surface states emission suggest that after the intercalation step, a thin layer of ZnS surrounds the CdS nanoparticles, thus forming a core–shell structure. Subsequent to the second sulfidation, a further red-shift in absorption suggests the formation of a thicker ZnS coating on CdS. Electron diffraction of CdS nanoparticles coated with thicker ZnS showed the diffraction patterns of only ZnS, as expected for core–shell structures.
 
Publisher Elsevier
 
Date 2009-03-19T05:10:04Z
2011-11-25T19:26:18Z
2011-12-26T13:07:10Z
2011-12-27T05:55:14Z
2009-03-19T05:10:04Z
2011-11-25T19:26:18Z
2011-12-26T13:07:10Z
2011-12-27T05:55:14Z
2008
 
Type Article
 
Identifier Applied Surface Science 254(16), 5028-5033
0169-4332
http://dx.doi.org/10.1016/j.apsusc.2008.01.152
http://hdl.handle.net/10054/980
http://dspace.library.iitb.ac.in/xmlui/handle/10054/980
 
Language en