Gamma ray shifted and enhanced photoluminescence of graphene quantum dots

被引：14
作者：
Wang, Tao [1 ,2 ,3 ]
Reckmeier, Claas J. [4 ,5 ]
Lu, Shunkai [1 ,2 ]
Li, Yanqing [1 ,2 ]
Cheng, Yafei [1 ,2 ]
Liao, Fan [1 ,2 ]
Rogach, Andrey L. [4 ,5 ]
Shao, Mingwang [1 ,2 ]
机构：
[1] Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Peoples R China
[2] Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Suzhou 215123, Peoples R China
[3] Anqing Normal Univ, Sch Chem & Chem Engn, Anhui Prov Lab Optoelect & Magnetism Funct Mat, Anqing 246001, Anhui, Peoples R China
[4] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China
[5] City Univ Hong Kong, CFP, Kowloon, Hong Kong, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2016年 / 4卷 / 44期
基金：
中国国家自然科学基金;
关键词：
CARBON DOTS; INDUCED REDUCTION; FACILE SYNTHESIS; IRRADIATION; RADIATION; GRAPHITE; ROUTE; OXIDE; ELECTROLUMINESCENCE; LUMINESCENCE;
D O I：
10.1039/c6tc03100e
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We demonstrate how the emission of graphene quantum dots with a surface consisting of hydroxyl and quinone groups is tuned from green to blue by gamma-ray irradiation ranging from 0 to 500 kGy and in the presence of radical scavengers. The photoluminescence quantum yield increases from 13 to 52% under optimal irradiation conditions. Gamma-ray irradiation triggered radicals either oxidize or reduce the surface groups of graphene quantum dots altering their chemical structure, reducing surface traps and enhancing the emission. The resulting chemical composition of surface groups derived from XPS analysis influences emission pathways and trap formation. Furthermore, the irradiated nanoparticles show a better performance and cell viability in bioimaging applications as compared to the pristine graphene quantum dots.
引用
收藏
页码：10538 / 10544
页数：7
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