NDLI: Photoluminescence and optical nonlinearity of CdS quantum dots synthesized in a functional copolymer hydrogel template

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New Journal of Chemistry Vol - 41 Issue - 8

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Photoluminescence and optical nonlinearity of CdS quantum dots synthesized in a functional copolymer hydrogel template

Content Provider	Royal Society of Chemistry (RSC)
Author	Kochimoolayil, George Elias Pillai, Jisha J. Antony, Jolly Vakayil Nampoori, V. P. N. Kurian, Philip
Copyright Year	2017
Abstract	A hydrogel template assisted synthesis was employed to prepare CdS quantum dots (QDs) in poly(methyl methacrylate-co-acrylic acid), p(MMA-co-AAc), for the ultimate formation of a nanocomposite. The copolymer hydrogelates in an aqueous solution of precursor reagents and acts as a template for the absorption of Cd2+ ions, which is followed by CdS QD formation. The CdS QDs are positioned inside the core of the micelles in the copolymer hydrogel. The ultraviolet-visible (UV-vis) absorption and band edge emission of the composite solution are blue shifted relative to bulk CdS. The composition of acrylic acid (AAc) in the copolymer has an influence on the size as well as on the surface effect of the CdS QDs, which is reflected in the photoluminescence (PL) of the composite. The copolymer is capable of passivating CdS QDs for intense band edge emission with weak defect state emission. The z-scan technique gives an exhibition of the nonlinear refraction and absorption of the composite, which are determined by the AAc content and thus the size of the CdS QDs present in the composite. The composites show self defocusing phenomena for their negative nonlinear refraction. The magnitude of nonlinear refractive index increases with the CdS QD size. The copolymer with a large number of AAc units forms a CdS QD composite with reverse saturable absorption (RSA) near the focus and saturable absorption (SA) at the focus. The RSA behavior of the composites shows that they can be used in optical limiting devices.
Starting Page	3524
Ending Page	3536
Page Count	13
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	41
Issue Number	9
Journal	New Journal of Chemistry
DOI	10.1039/c6nj03665a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Z-scan technique Carboxylic acid Photoluminescence Nanocomposite Copolymer RSA Security Gel
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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