Doping effect and fluorescence quenching mechanism of N-doped graphene quantum dots in the detection of dopamine

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • P. Wang
  • H.J. Li
  • J.H. Yang
  • Y. Li

Detail(s)

Original languageEnglish
Pages (from-to)563-571
Journal / PublicationTalanta
Volume196
Online published3 Jan 2019
Publication statusPublished - 1 May 2019

Abstract

Element doping is recognized as a powerful way to modify surface defect structure and further enhance the fluorescence performance of graphene quantum dots (GQDs). N-doped, S-doped and S, N co-doped GQDs were synthesized to explore the influence of element doping on fluorescence sensing of dopamine (DA) biomolecules. Two interesting works are found, one is that the N-doped GQDs with urea as N source are more effective than the S-doped and S,N co-doped GQDs, characterized by the higher quantum yield (QY) up to 78% and sensitive fluorescence quenching performance to DA. The other is that the N-doped GQDs with ethylenediamine as N source have the highest QY up to 95%, however, exhibits no quenching performance to DA. This abnormal observation is discussed based on the microstructure analysis. Under the optimal reaction condition, the N-doped GQDs exhibit a dual linear relationship of quenching intensity with DA concentration in the range of 10–3000 nM and 3000–7000 nM with detection limits of 3.3 and 611 nM, respectively. The quenching mechanism of N-doped GQDs toward DA is explored from the view of N chemical states, biomolecule structure of DA homologues and redox reaction of DA.

Research Area(s)

  • Dopamine, Doping effect, Fluorescent sensing, Graphene quantum dot, Sensitivity

Citation Format(s)

Doping effect and fluorescence quenching mechanism of N-doped graphene quantum dots in the detection of dopamine. / Ma, Y.; Chen, A.Y.; Xie, X.F.; Wang, X.Y.; Wang, D.; Wang, P.; Li, H.J.; Yang, J.H.; Li, Y.

In: Talanta, Vol. 196, 01.05.2019, p. 563-571.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review