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

作　　者：胡音 何大伟 王永生 段嘉华 王素凤 富鸣 王闻硕 

机构地区：[1]Key Laboratory of Luminescence and Optical Information, Ministry of Education,Institute of Optoelectronic Technology, Beijing Jiaotong University [2]Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nuremberg,Cauerstrasse 4,D-91058 Erlangen, Germany

出　　处：《Chinese Physics B》2014年第12期513-519,共7页中国物理B（英文版）

基　　金：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);the Beijing Natural Science Foundation,China(Grant No.4132031)

摘　　要：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.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.

关 键 词：graphene quantum dots tunable luminescence 

分 类 号：O482.31[理学—固体物理]