可见光谱
量子点
材料科学
量子产额
石墨烯
光化学
光催化
罗丹明B
发光
光电子学
石墨烯量子点
兴奋剂
吸收(声学)
纳米技术
化学
荧光
光学
物理
有机化学
复合材料
催化作用
作者
Dan Qu,Min Zheng,Peng Du,Yue Zhou,Ligong Zhang,Di Li,Huaqiao Tan,Zhao Zhao,Zhigang Xie,Zaicheng Sun
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2013-01-01
卷期号:5 (24): 12272-12272
被引量:1004
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.
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