Surface characterization of GSH-CdTe quantum dots

J. L. Gautier, J. P. Monrás, I. O. Osorio-Román, C. C. Vásquez, D. Bravo, T. Herranz, J. F. Marco, J. M. Pérez-Donoso

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The 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.

Original languageEnglish
Pages (from-to)113-118
Number of pages6
JournalMaterials Chemistry and Physics
Volume140
Issue number1
DOIs
Publication statusPublished - 15 Jun 2013

Keywords

  • X-ray photo-emission spectroscopy (XPS) Photoluminescence spectroscopy Nanostructures Composite materials Luminescence Energy spectroscopy for chemical analysis (ESCA)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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