High fluorescent sulfur regulating graphene quantum dots with tunable photoluminescence properties

Yi Luo; Ming Li; Lang Sun; Yongjie Xu; Ming Li; Guanghui Hu; Tao Tang; Jianfeng Wen; Xinyu Li; Jiye Zhang; Liang Wang

doi:10.1016/j.jcis.2018.06.016

High fluorescent sulfur regulating graphene quantum dots with tunable photoluminescence properties

J Colloid Interface Sci. 2018 Nov 1:529:205-213. doi: 10.1016/j.jcis.2018.06.016. Epub 2018 Jun 7.

Authors

Yi Luo¹, Ming Li², Lang Sun¹, Yongjie Xu¹, Ming Li³, Guanghui Hu¹, Tao Tang¹, Jianfeng Wen¹, Xinyu Li¹, Jiye Zhang⁴, Liang Wang⁵

Affiliations

¹ College of Science, Guilin University of Technology, Guilin 541004, PR China.
² Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China.
³ College of Science, Guilin University of Technology, Guilin 541004, PR China. Electronic address: liming928@163.com.
⁴ School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China.
⁵ Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China. Electronic address: wangl@shu.edu.cn.

PMID: 29894939
DOI: 10.1016/j.jcis.2018.06.016

Abstract

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 sp² 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.

Keywords: Graphene quantum dots; High fluorescent; Photoluminescence; Sulfur regulating.