Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34914
Title: Sulphur doping : a facile approach to tune the electronic structure and optical properties of graphene quantum dots
Authors: Li, X
Lau, SP 
Tang, L
Ji, R
Yang, P
Issue Date: 2014
Publisher: Royal Society of Chemistry
Source: Nanoscale, 2014, v. 6, no. 10, p. 5323-5328 How to cite?
Journal: Nanoscale
Abstract: Sulphur-doped carbon-based materials have attracted a great deal of interest because of their important applications in the fields of oxygen reduction reactions, hydrogen storage, supercapacitors, photocatalysts and lithium ion batteries. Here, we report a new member of sulphur-doped carbon-based materials, i.e. sulphur doped graphene quantum dots (S-GQDs). The S-GQDs were prepared by a hydrothermal method using fructose and sulphuric acid as source materials. Absorption and photoluminescence investigations show that inter-band crossings are responsible for the observed multiple emission peaks. The incorporation of ∼1 at% of S into the quantum dots can effectively modify the electronic structure of the S-GQDs by introducing S-related energy levels between π and π* of C. The additional energy levels in the S-GQDs lead to efficient and multiple emission peaks.
URI: http://hdl.handle.net/10397/34914
ISSN: 2040-3372 (electronic)
DOI: 10.1039/C4NR00693C
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