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ZnS nanoclusters in LB multilayers

DSpace at IIT Bombay

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Title ZnS nanoclusters in LB multilayers
 
Creator PARHIZKAR, A
KUMAR, NP
SHUKLA, B
SRINIVASA, RS
VITTA, S
KUMAR, N
TALWAR, SS
MAJOR, SS
 
Subject langmuir-blodgett-films
quantum dots
cadmium
cds
acid
nanoparticles
crystallites
spectroscopy
spectra
layers
langmuir blodgett
zinc arachidate
zinc sulphide
nanoclusters
molecular packing
 
Description Zinc arachidate (ZnA) LB multilayers have been exposed to H2S to form ZnS nanoclusters within the layered matrix of arachidic acid (AA). The as-deposited ZnA multilayer consists of arachidate molecules packed in a hexagonal layer cell, with the alkyl chain tilted at about 32 degrees away from the layer normal. FTIR and UV-vis studies show that the conversion of arachidate salt into arachidic acid and the formation of ZnS is completed in 2-3 h. Blue shift in absorption onset and excitonic peak similar to 290 nm indicates nanocrystalline nature of ZnS. TEM studies show that ZnS nanoclusters of size similar to 5 nm are formed. X-ray reflection and grazing angle diffraction studies and changes in the nature of CH2 scissoring mode peak, of ZnS-AA composite multilayer show that the molecular packing corresponds to a closely packed structure based on orthorhombic subcell in which the chains are tilted by similar to 27 degrees towards nearest neighbours. This is in contrast to a loose 'rotator phase like' packing of molecules in the precursor ZnA multilayer. (c) 2004 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-10-24T06:12:04Z
2011-12-15T09:11:31Z
2011-10-24T06:12:04Z
2011-12-15T09:11:31Z
2005
 
Type Article; Proceedings Paper
 
Identifier COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,257-58,177-182
0927-7757
http://dx.doi.org/10.1016/j.colsurfa.2004.10.027
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15345
http://hdl.handle.net/100/2114
 
Source 10th International Conference on Organized Molecular Films,Beijing, PEOPLES R CHINA,OCT 05-10, 2003
 
Language English