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

被引：1091

作者：

Qu, Dan ^{[1
,2
]}

Zheng, Min ^{[1
]}

Du, Peng ^{[1
,2
]}

Zhou, Yue ^{[3
]}

Zhang, Ligong ^{[1
]}

Li, Di ^{[1
]}

Tan, Huaqiao ^{[1
]}

Zhao, Zhao ^{[1
,2
]}

Xie, Zhigang ^{[4
]}

Sun, Zaicheng ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Luminescence & Applicat, Changchun 130033, Jilin, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100000, Peoples R China

[3] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Appl Opt, Changchun 130033, Jilin, Peoples R China

[4] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Jilin, Peoples R China

来源：

NANOSCALE | 2013年 / 5卷 / 24期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

ONE-STEP SYNTHESIS; CARBON DOTS; NITROGEN; NANODOTS; SULFUR; PHOTOLUMINESCENCE; FLUORESCENCE; SHEETS; ROUTE; RICH;

D O I：

10.1039/c3nr04402e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：12272 / 12277

页数：6

共 32 条

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