Journal
JOURNAL OF LUMINESCENCE
Volume 166, Issue -, Pages 322-327Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2015.05.056
Keywords
Graphitic quantum dots; Electrochemical method; Luminescence mechanism; Surface oxidation degree; Photoluminescence property
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Funding
- National Natural Science Foundation of China [51202011, 21104004]
- Beijing Organization Department Outstanding Talented Person project [2013D009006000001]
- Fundamental Research Funds for the Central University [FRT-TP-14-010A2]
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Graphitic quantum dots (GQDs), as a new class of quantum dots, possess unique properties. Among the various reported approaches for their fabrication, electrochemical method possesses numerous advantages compared with others. In particular, the formation process of the GQDs could be precisely controlled by this method through adjusting the electrochemical parameters and environment. In this study, GQDs with multi-color fluorescence (FL) were obtained by this method through tuning only the applied potential window of cycling voltammetry. The luminescence mechanism of those GQDs was discussed and explained by the ultraviolet (UV)-visible, photoluminescence (PL), and photoluminescence excitation (PLE) spectra. The influence of the applied potential window on the PL properties of GQDs and the relationship between the degree of surface oxidation and PL properties were also investigated. (C) 2015 Elsevier B.V. All rights reserved.
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