Fluorescence quenching of cationic organic dye by graphene: interaction and its mechanism

被引：30

作者：

Pang, Yuehong ^{[1
]}

Cui, Yan ^{[1
]}

Ma, Yun ^{[1
]}

Qian, He ^{[1
]}

Shen, Xiaofang ^{[1
]}

机构：

[1] Jiangnan Univ, Sch Food Sci & Technol, State Key Lab Food Sci & Technol, Wuxi 214122, Peoples R China

来源：

MICRO & NANO LETTERS | 2012年 / 7卷 / 07期

基金：

中国国家自然科学基金;

关键词：

RESONANCE ENERGY-TRANSFER; HUMAN SERUM-ALBUMIN; OXIDE SHEETS; FILMS; DOPAMINE;

D O I：

10.1049/mnl.2012.0338

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Graphene, an extended conjugated system, is an efficient fluorescence quencher for various organic dyes and quantum dots. In this Letter, rhodamine 6G (R6G) was used as a typical representative probe molecule to investigate the interaction between graphene and cationic organic dye. The as-prepared graphene oxide and graphene were characterised by UV-vis spectroscopy, infrared spectroscopy and atomic force microscope, respectively. The interaction between graphene and R6G was studied by various spectroscopic techniques. The results revealed that no ground state complex was formed in the presence of graphene. The observed fluorescence quenching of R6G by graphene went through an electron transfer process. The Stern-Volmer analysis indicated that the strong ability of graphene to quench the intrinsic fluorescence of R6G was based on a dynamic quenching mechanism. The fluorescence decay analysis of R6G in the presence of graphene showed a remarkable decrease in lifetime from 4.42 to 3.94 ns, which further confirmed that photoinduced electron transfer occurred between them, and the quenching of R6G by graphene was dynamic in nature.

引用

页码：608 / 612

页数：5

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