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Glutathione Capped CdSe Quantum Dots: Synthesis, Characterization, Morphology, and Application as a Sensor for Toxic Metal Ions.
Journal of Nanoscience and Nanotechnology 2019 Februrary 2
Glutathione (GSH) functionalized CdSe quantum dots (QDs) (GSH- f -CdSe QDs) were prepared via a simple one-pot strategy at low temperature. The as-synthesized CdSe QDs were characterized by FT-IR and XPS analyses. The morphology, physical structure and size distribution of GSH- f -CdSe QDs were investigated by TEM, XRD and DLS analyses, respectively. The GSH- f -CdSe QDs exhibited excellent stability of optical properties as investigated by UV-Vis absorption and photoluminescence (PL) spectroscopy. The high affinity of GSH towards heavy metal ions made the GSH- f -CdSe QDs quite susceptible to Pb2+ ion which poses serious threat to the health and environment. The PL intensity of GSH- f -CdSe QDs was observed to be apparently quenched in the presence of Pb2+ ions in aqueous solution rendering their potentialities as a sensor for detection of toxic heavy metal ions.
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