An approach to controlling the fluorescence of graphene quantum dots: From surface oxidation to fluorescent mechanism

doi:10.1088/1674-1056/23/12/128103

Abstract

We report a facile method of synthesizing graphene quantum dots (GQDs) with tunable emission. The as-prepared GQDs each with a uniform lateral dimension of ca. 6 nm have fine solubility and high stability. The photoluminescence mechanism is further investigated based on the surfacestructure and the photoluminescence behaviors. Based on our discussion, the green fluorescence emission can be attributed to the oxygen functional groups, which could possess broad emission bands within the π–π^* gap. This work is helpful to explain the vague fluorescent mechanism of GQDs, and the reported synthetic method is useful to prepare GQDs with controllable fluorescent colors.

Keywords: graphene quantum dots tunable luminescence

Received: 07 May 2014
Revised: 23 June 2014
Accepted manuscript online:

PACS:	81.05.ue	(Graphene)
	73.21.Hb	(Quantum wires)
	87.15.mq	(Luminescence)

Fund:

Project supported by the National Basic Research Program of China (Grant Nos. 2011CB932700 and 2011CB932703), the National Natural Science Foundation of China (Grant Nos. 61335006, 61378073, and 61077044), and the Beijing Natural Science Foundation, China (Grant No. 4132031).

Corresponding Authors: He Da-Wei, Wang Wen-Shuo
E-mail: dwhe@bjtu.edu.cn;wenshuo.wang@fau.de

Cite this article:

Hu Yin (胡音), He Da-Wei (何大伟), Wang Yong-Sheng (王永生), Duan Jia-Hua (段嘉华), Wang Su-Feng (王素凤), Fu Ming (富鸣), Wang Wen-Shuo (王闻硕) An approach to controlling the fluorescence of graphene quantum dots: From surface oxidation to fluorescent mechanism 2014 Chin. Phys. B 23 128103


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An approach to controlling the fluorescence of graphene quantum dots: From surface oxidation to fluorescent mechanism

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