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Issue 24, 2013
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Highly luminescent S, N co-doped graphene quantum dots with broad visible absorption bands for visible light photocatalysts

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Abstract

A facile hydrothermal synthesis route to N and S, N co-doped graphene quantum dots (GQDs) was developed by using citric acid as the C source and urea or thiourea as N and S sources. Both N and S, N doped GQDs showed high quantum yield (78% and 71%), excitation independent under excitation of 340–400 nm and single exponential decay under UV excitation. A broad absorption band in the visible region appeared in S, N co-doped GQDs due to doping with sulfur, which alters the surface state of GQDs. However, S, N co-doped GQDs show different color emission under excitation of 420–520 nm due to their absorption in the visible region. The excellent photocatalytic performance of the S, N co-doped GQD/TiO2 composites was demonstrated by degradation of rhodamine B under visible light. The apparent rate of S, N:GQD/TiO2 is 3 and 10 times higher than that of N:GQD/TiO2 and P25 TiO2 under visible light irradiation, respectively.

Graphical abstract: Highly luminescent S, N co-doped graphene quantum dots with broad visible absorption bands for visible light photocatalysts

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Supplementary files

Article information


Submitted
19 Aug 2013
Accepted
29 Sep 2013
First published
07 Oct 2013

Nanoscale, 2013,5, 12272-12277
Article type
Paper

Highly luminescent S, N co-doped graphene quantum dots with broad visible absorption bands for visible light photocatalysts

D. Qu, M. Zheng, P. Du, Y. Zhou, L. Zhang, D. Li, H. Tan, Z. Zhao, Z. Xie and Z. Sun, Nanoscale, 2013, 5, 12272 DOI: 10.1039/C3NR04402E

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