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

doi:10.1016/j.matchemphys.2013.03.008

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

Life Sciences School

Research output: Contribution to journal › Article › peer-review

18 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 language	English
Pages (from-to)	113-118
Number of pages	6
Journal	Materials Chemistry and Physics
Volume	140
Issue number	1
DOIs	https://doi.org/10.1016/j.matchemphys.2013.03.008
Publication status	Published - 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

General Materials Science
Condensed Matter Physics

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title = "Surface characterization of GSH-CdTe quantum dots",

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.",

keywords = "X-ray photo-emission spectroscopy (XPS) Photoluminescence spectroscopy Nanostructures Composite materials Luminescence Energy spectroscopy for chemical analysis (ESCA)",

author = "Gautier, {J. L.} and Monr{\'a}s, {J. P.} and Osorio-Rom{\'a}n, {I. O.} and V{\'a}squez, {C. C.} and D. Bravo and T. Herranz and Marco, {J. F.} and P{\'e}rez-Donoso, {J. M.}",

note = "Funding Information: The authors thank CSIC-USACH cooperation. This work was supported by Fondecyt grants 1110755 (JLG), 1090097 (CCV), 11100067 (IO), 11110076 (DB) and 11110077 (JMP). TH and JFM also thank financial support from the Spanish Ministry of Science and Innovation through project MAT2009-14578-C03-01.",

year = "2013",

month = jun,

day = "15",

doi = "10.1016/j.matchemphys.2013.03.008",

language = "English",

volume = "140",

pages = "113--118",

journal = "Materials Chemistry and Physics",

issn = "0254-0584",

publisher = "Elsevier B.V.",

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T1 - Surface characterization of GSH-CdTe quantum dots

AU - Gautier, J. L.

AU - Monrás, J. P.

AU - Osorio-Román, I. O.

AU - Vásquez, C. C.

AU - Bravo, D.

AU - Herranz, T.

AU - Marco, J. F.

AU - Pérez-Donoso, J. M.

N1 - Funding Information: The authors thank CSIC-USACH cooperation. This work was supported by Fondecyt grants 1110755 (JLG), 1090097 (CCV), 11100067 (IO), 11110076 (DB) and 11110077 (JMP). TH and JFM also thank financial support from the Spanish Ministry of Science and Innovation through project MAT2009-14578-C03-01.

PY - 2013/6/15

Y1 - 2013/6/15

N2 - 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.

AB - 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.

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

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SP - 113

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JO - Materials Chemistry and Physics

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Surface characterization of GSH-CdTe quantum dots

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