Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 529, Issue -, Pages 205-213Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.06.016
Keywords
Sulfur regulating; High fluorescent; Graphene quantum dots; Photoluminescence
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Funding
- National Natural Science Foundation of China [11764011, 21671129, 21571124, 51472241]
- Shanghai Sailing Program [16YF1404400]
- Natural Science Foundation of Guangxi Province, P.R. China [2016GXNSFAA380008]
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Sulfur-doped graphene quantum dots (S-GQDs) were synthesized by two facile hydrothermal technologies. The photoluminescence (PL) properties of the GQDs and S-GQDs samples were mainly investigated. Through regulating the content of S powders in S-GQDs synthesizing process, the optimal S-GQDs have a high S/C atomic ratio of 19.53%. The S doping introduce more functional groups on the C sp(2) skeleton of S-3 sample and result in the appearance of the strong absorption band in the UV region. In comparison with other reported S-GQDs, the S-GQDs exhibit overwhelming high fluorescence quantum yield (57%) and excitation-independent emission, resulting from the outcome of the doped sulfur atoms. Moreover, the PL intensity of GQDs can be increased by doping it with S and the increasing efficiency depends on the thiophene sulfur content. (C) 2018 Elsevier Inc. All rights reserved.
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