Journal
POLYMER
Volume 52, Issue 4, Pages 1045-1054Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2011.01.004
Keywords
Poly(vinyl alcohol); Nanoparticles; UV-vis spectroscopy
Categories
Funding
- CAPES [Proc:5548-09-8, PNPD/2010, 433/2010]
- FAPEMIG [Proc:PPM-00343-09]
- CNPq [Proc:305098/2007-1]
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In the present research it is reported the synthesis and characterization of CdS nanoparticles (NPs) prepared using carboxylic-functionalized poly (vinyl alcohol) (PVA) as the ligand via aqueous route at room temperature and ambient pressure. Different molar concentrations of carboxylic-PVA and PVA were investigated aiming at producing stable colloidal systems. Carboxylic-PVA was conjugated with BSA (bovine serum albumin) and used as capping ligand in the preparation of CdS nanocrystals. UV-visible spectroscopy, photoluminescence spectroscopy, and transmission electron microscopy were used to characterize the kinetics and the relative stability of polymer-capped CdS nanocrystals. The results have clearly indicated that the carboxylic-functionalized PVA was much more effective on nucleating and stabilizing colloidal CdS nanoparticles in aqueous suspensions compared to PVA. In addition, the CdS nanocrystals were obtained in the so-called quantum-size confinement regime, with the calculated average size below 4.0 nm and fluorescent activity. Thus, a novel simple route was successfully developed for synthesizing nanohybrids based on quantum dots and water-soluble chemically functionalized polymers with incorporated carboxylic moiety with the possibility of direct bioconjugation. (C) 2011 Elsevier Ltd. All rights reserved.
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