Direct determination of graphene quantum dots based on terbium-sensitized luminescence.

Autor: Llorent-Martínez EJ; Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Av. Camilo José Cela, Ciudad Real E-13071, Spain; Regional Institute for Applied Chemistry Research (IRICA), Camilo José Cela Av., Ciudad Real E-13071, Spain., Molina-García L; Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain., Durán GM; Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Av. Camilo José Cela, Ciudad Real E-13071, Spain; Regional Institute for Applied Chemistry Research (IRICA), Camilo José Cela Av., Ciudad Real E-13071, Spain., Ruiz-Medina A; Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain., Ríos Á; Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Av. Camilo José Cela, Ciudad Real E-13071, Spain. Electronic address: Angel.Rios@uclm.es.
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2018 Jun 05; Vol. 198, pp. 177-181. Date of Electronic Publication: 2018 Mar 07.
DOI: 10.1016/j.saa.2018.03.013
Abstrakt: Graphene quantum dots (GQD) were determined in water samples using terbium-sensitized luminescence (TSL). Terbium ions complex with GQD due to the carboxylic groups that are usually present in these nanomaterials, increasing the luminescence signal of terbium. In Tb(III)-GQD complexes, GQD absorb energy at their characteristic excitation wavelength and transfer it to terbium ion, which emits at its particular emission wavelength. The analytical signal, measured at λ exc =257nm and λ em =545nm, increases proportionally to GQD concentration between 50 and 500μgL -1 . Under optimum conditions, the proposed method presents a detection limit of 15μgL -1 and is selective to GQD in the presence of other nanomaterials of similar size. As GQD are highly water-soluble, they are potential contaminants in environmental or drinking waters water samples, and hence the method was applied to the analysis of different drinking waters which were the target samples for the application of the developed method.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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