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Reusable sensor based on functionalized carbon dots for the detection of silver nanoparticles in cosmetics via inner filter effect.

Authors
  • Cayuela, Angelina
  • Soriano, M Laura
  • Valcárcel, Miguel
Type
Published Article
Journal
Analytica Chimica Acta
Publisher
Elsevier
Publication Date
May 04, 2015
Volume
872
Pages
70–76
Identifiers
DOI: 10.1016/j.aca.2015.02.052
PMID: 25892071
Source
Medline
Keywords
License
Unknown

Abstract

We report a low cost selective analytical method based on inner filter effect (IFE) for citrate-silver nanoparticle (cit-AgNP) detection, in which fluorescent amine-derivatized carbon dots (a-CDs) act as the donor and aggregated cit-AgNPs as the energy receptor. Carbon dots (CDs) were chemically modified with ethylenediamine (EDA) moieties via amidic linkage displaying an emission band at 440nm. The presence of cit-AgNPs produces a remarkably quenching of a-CD fluorescence via IFE, since the free amine groups at CD surface induce the aggregation of cit-AgNPs accompany by a red-shifting of their characteristic plasmon absorption wavelength, which resulted in "turn-on" of the IFE-decreased in CD fluorescence. The proposed method, which involves the use of chelating agents for removal of metal ions interferences, exhibits a good linear correlation for detection of cit-AgNPs from 1.23×10(-5) to 6.19×10(-5) mol L(-1), with limits of detection (LOD) and quantification (LOQ) of 5.17×10(-6) and 1.72×10(-5) mol L(-1,) respectively. This method demonstrates to be efficient and selective for the determination of cit-AgNPs in complex matrices such as cosmetic creams and reveals many advantages such as low cost, reusability, high sensitivity and non time-consuming compared with other traditional methods.

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