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Issue 10, 2014
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Sulphur doping: a facile approach to tune the electronic structure and optical properties of graphene quantum dots

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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.

Graphical abstract: Sulphur doping: a facile approach to tune the electronic structure and optical properties of graphene quantum dots

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Publication details

The article was received on 07 Feb 2014, accepted on 01 Mar 2014 and first published on 04 Mar 2014


Article type: Paper
DOI: 10.1039/C4NR00693C
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Citation: Nanoscale, 2014,6, 5323-5328
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    Sulphur doping: a facile approach to tune the electronic structure and optical properties of graphene quantum dots

    X. Li, S. P. Lau, L. Tang, R. Ji and P. Yang, Nanoscale, 2014, 6, 5323
    DOI: 10.1039/C4NR00693C

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