期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 428, 期 -, 页码 235-241出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.04.050
关键词
CdSe/ZnS quantum dots; Fluorescence intensity; Microwave irradiation; Sulfonylurea herbicides; Water solubilization
资金
- MINECO [CTQ 2013-48411]
- FEDER founds
- Spanish Ministry of Economy and Competitiveness
A simple and fast procedure for water solubilization of CdSe/ZnS quantum dots (QDs) using microwave irradiation (MW) has been optimized. The CdSe/ZnS QDs were synthesized in organic media and water solubilization was achieved by replacing the initial hydrophobic ligands (TOPO and TOP) with hydrophilic heterobifunctional thiol ligands, such as L-cysteine (L-Cys), 3-mercaptopropionic acid (3-MPA) and cysteamine (CTAM). The use of MW irradiation allowed carrying out the modification of the surface thiol of QDs in a simple and fast way (only 40 s was required). Different optimization studies based on activation-time, irradiation-time, concentration of ligands, pH and lifetime fluorescent properties were carried out in order to obtain the best results for the solubilization of QDs. By the proposed method, the resulting water-soluble QDs exhibit a strong fluorescence emission at about 590 nm, with a high and reproducible photostability and acceptable yields. With the aim of contributing to exploiting the advantages of synthetized QDs from an analytical point of view, the different behavior with sulfonylurea herbicides (SUHs) were studied. (C) 2014 Elsevier Inc. All rights reserved.
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