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

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Ligong Qu, Dan Sun, Zaicheng Du, Peng Xie, Zhigang Tan, Huaqiao Li, Di Zhao, Zhao Zhou, Yue Zheng, Min
Copyright Year	2013
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.
Starting Page	12272
Ending Page	12277
Page Count	6
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	5
Issue Number	24
Journal	Nanoscale
DOI	10.1039/c3nr04402e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Quantum Urea Rhodamine Hydrothermal synthesis Graphene Absorption band Dopant Thiourea Sulfur Exponential decay
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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