Theoretical Investigations of Optical Origins of Fluorescent Graphene Quantum Dots

被引：72
作者：
Wang, Jingang [1 ,2 ,3 ,4 ]
Cao, Shuo [1 ,2 ]
Ding, Yong [1 ,2 ]
Ma, Fengcai [1 ,2 ]
Lu, Wengang [3 ]
Sun, Mengtao [1 ,2 ,3 ]
机构：
[1] Liaoning Univ, Dept Chem, Shenyang 110036, Peoples R China
[2] Liaoning Univ, Dept Phys, Shenyang 110036, Peoples R China
[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing Key Lab Nanomat & Nanodevices, Beijing 100190, Peoples R China
[4] Shenyang Aerosp Univ, Dept Phys, Shenyang 110036, Peoples R China
来源：
SCIENTIFIC REPORTS | 2016年 / 6卷
基金：
美国国家科学基金会;
关键词：
GAS;
D O I：
10.1038/srep24850
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The optical properties of graphene quantum dots (GQDs) were investigated theoretically. We focused on the photoinduced charge transfer and electron-hole coherence of single-layer graphene in the electronic transitions in the visible regions. Surface functionalization with donor or acceptor groups produced a red shift in the absorption spectrum, and electrons and holes were highly delocalized. The recombination of excited, well-separated electron-hole (e-h) pairs can result in enhanced fluorescence. This fluorescence enhancement by surface functionalization occurs because of the decreased symmetry of the graphene resulting from the roughened structure of the surface-functionalized GQDs.
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页数：5
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