Synthesis and characterization of organic–inorganic hybrid materials prepared by sol–gel and containing CdS nanoparticles prepared by a colloidal method using poly(N-vinyl-2-pyrrolidone)

This paper describes the synthesis and characterization of CdS nanoparticles (NPs) stabilized with poly( N -vinyl-2-pyrrolidone) and their further immobilization on a hybrid organic–inorganic matrix produced by the sol–gel process. The production of the hybrid matrix doped with CdS NPs was carried o...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2014-07, Vol.71 (1), p.69-78
Main Authors: Gonçalves, Luis F. F. F., Silva, Carlos J. R., Kanodarwala, Fehmida K., Stride, John A., Gomes, Maria J. M.
Format: Article
Language:English
Subjects:
Cadmium sulfides
Ceramics
Chemical synthesis
Chemistry
Chemistry and Materials Science
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Colloids
Composites
Condensates
Crosslinking
Dispersion
Dispersions
Exact sciences and technology
Gelation
General and physical chemistry
Glass
Inorganic Chemistry
Isocyanates
Materials Science
Nanocomposites
Nanoparticles
Nanotechnology
Natural Materials
Optical and Electronic Materials
Original Paper
Photoluminescence
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Precursors
Size effects
Sol gel process
Sol-gel processes
Synthesis
Transmission electron microscopy
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Summary:This paper describes the synthesis and characterization of CdS nanoparticles (NPs) stabilized with poly( N -vinyl-2-pyrrolidone) and their further immobilization on a hybrid organic–inorganic matrix produced by the sol–gel process. The production of the hybrid matrix doped with CdS NPs was carried out in two steps. In the first step a precursor, designated diureasil precursor, was synthesized from the reaction between the terminal amine groups of α,ω-diamine-poly(oxyethylene- co -oxypropylene) and the isocyanate group of 3-isocyanatopropyltriethoxysilane. The next step involved the hydrolysis and condensation reactions of ethoxy groups attached to silicon, this step resulting in the formation of a crosslinked siliceous network linked through urea bonds to a poly(oxyethylene)/poly(oxypropylene) chain. The NPs were added to the diureasil precursor before the gelation process to allow a homogeneous dispersion of the NPs within the matrix. The developed method allowed the transfer of colloidal NPs to a solid matrix without the need of exchange the capping agents or the solvent. The materials were characterized by absorption, steady-state photoluminescence spectroscopy and by TEM. The results obtained showed the presence of CdS NPs with quantum size effect dispersed within the diureasil matrix. The obtained nanocomposites show a high transparency in the visible range accounting for the good dispersion of the NPs within the matrix. The TEM analysis confirmed that the NPs are uniformly dispersed within the diureasil matrix.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-014-3334-4