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Surface characterization of GSH-CdTe quantum dots

AutorGautier, J.L.; Monrás, J.P.; Osorio-Román, I.O.; Vásquez, C.C.; Bravo, D.; Herranz, T.; Marco, J.F. ; Pérez-Donoso, J.M.
Fecha de publicación2013
CitaciónMaterials Chemistry and Physics 140: 113- 118 (2013)
ResumenThe surface characterization of CdTe QDs synthesized by a novel procedure using glutathione (GSH), low temperatures (60-90 °C) and K 2TeO3 as the -Te precursor is reported. Fluorescence of the produced QDs is stable in the pH range 6-13 and QDs inside eukaryotic cells are highly fluorescent. The surface composition of GSH-CdTe QDs with different spectroscopic properties and particle size distributions was determined by XPS. The XPS analysis indicated that the QDs are essentially CdTe, although all nanoparticles contain 12-24% of CdO (and in one case also TeO2). GSH decomposes with reaction time releasing small amounts of S-2 ions that react with Cd(Te) to yield Cd(Te)S in a smaller amount than that of CdTe. Finally, the use of QDs in fluorescence mediated immunodetection of bacterial pathogens has been evaluated. © 2013 Elsevier B.V. All rights reserved.
Identificadoresdoi: 10.1016/j.matchemphys.2013.03.008
issn: 0254-0584
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