Synthesis and characterization of CdS quantum dots with carboxylic-functionalized poly (vinyl alcohol) for bioconjugation

POLYMER

卷:52

Article

Mansur, Herman S.¹  Mansur, Alexandra A. P.¹  Gonzalez, J. C.² 

[1] Univ Fed Minas Gerais, Sch Engn, Dept Met & Mat Engn, BR-66273127 Belo Horizonte, MG, Brazil

[2] Univ Fed Minas Gerais, Dept Phys, BR-66273127 Belo Horizonte, MG, Brazil

关键词: Poly(vinyl alcohol);    Nanoparticles;    UV-vis spectroscopy;   

DOI  :  10.1016/j.polymer.2011.01.004

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free