Silica-covered Au nanoresonators for fluorescence modulating of a graphene quantum dot  

作　　者：王素凤 何大伟 王永生 胡音 段嘉华 富鸣 王闻硕 

机构地区：[1]Key Laboratory of Luminescence and Optical Information of the Ministry of Education,Institute of Optoelectronic Technology,Beijing Jiaotong University

出　　处：《Chinese Physics B》2014年第9期483-487,共5页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China(Grant Nos.2011CB932700 and 2011CB932703);the National Natural Science Foundation of China(Grant Nos.61378073,61335006,91123025,and 61077044);the Beijing Natural Science Foundation,China(Grant No.4132031)

摘　　要：We synthesize Au@SiO2 composite particles with a core-shell structure, and utilize the Au@SiO2 nanoparticles to modulate the fluorescence emission of the graphene quantum dot （GQD） through varying the silica shell thickness. The silica shell thickness can be easily controlled by varying the coating time. After silica coating, we investigate the influence of the silica thickness on the fluorescence emission of the GQD and find that the fluorescence property of the GQD can be changed as expected by varying the thickness of the silica shell. We propose an optimized coating time for the silica shell under the interaction of fluorescence quenching and enhancement.We synthesize Au@SiO2 composite particles with a core-shell structure, and utilize the Au@SiO2 nanoparticles to modulate the fluorescence emission of the graphene quantum dot （GQD） through varying the silica shell thickness. The silica shell thickness can be easily controlled by varying the coating time. After silica coating, we investigate the influence of the silica thickness on the fluorescence emission of the GQD and find that the fluorescence property of the GQD can be changed as expected by varying the thickness of the silica shell. We propose an optimized coating time for the silica shell under the interaction of fluorescence quenching and enhancement.

关 键 词：graphene quantum dot FLUORESCENCE nanoparticles 

分 类 号：O471.1[理学—半导体物理] TG174.4[理学—物理]