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Fluorescent‐Magnetic Nanostructures Based on Polymer‐Quantum Dots Conjugates
Author(s) -
da Silva Maria I. N.,
Mansur Alexandra A. P.,
Schatkoski Vanessa,
Krambrock Klaus W. H.,
González Juan,
Mansur Herman S.
Publication year - 2012
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201100178
Subject(s) - quantum dot , photoluminescence , materials science , luminescence , nanoparticle , spectroscopy , polymer , transmission electron microscopy , fluorescence , polyvinyl alcohol , electron paramagnetic resonance , fluorescence spectroscopy , aqueous solution , nanotechnology , nanocrystal , photochemistry , chemical engineering , chemistry , nuclear magnetic resonance , optoelectronics , physics , quantum mechanics , engineering , composite material
Summary: In this study it is presented the synthesis and the characterization of Fluorescent‐Magnetic Nanostructures based on polymer‐quantum dots conjugates. Polyvinyl alcohol (PVA) was used as the capping‐ligand for the preparation of Cd x Mn 1‐x S semiconductor nanocrystals via aqueous colloidal chemistry. Different substitution ratios of Cd 2+ by Mn +2 ions were investigated aiming at the formation of stable nanoparticles with photo‐luminescent and semi‐magnetic properties. UV‐visible spectroscopy (UV‐vis), photoluminescence spectroscopy (PL), Electric Paramagnetic Resonance Spectroscopy (EPR), and transmission electron microscopy (TEM) were used to characterize the formation and the relative stability of Cd x Mn 1‐x S nanoparticles. The results have showed the influence of the Mn 2+ partially replacing Cd 2+ in the optical behavior of the quantum dots (QDs) produced. In addition, the Cd x Mn 1‐x S QDs have evidenced luminescent and semi‐magnetic properties. Thus, the biocompatible water‐soluble polymer was effective as ligand for synthesizing and stabilizing QDs conjugates with properties allowing them to be potentially applied as imaging and labeling probes in the biomedical field.