Quasi-Molecular Fluorescence from Graphene Oxide

被引：276

作者：

Galande, Charudatta ^{[3
]}

Mohite, Aditya D. ^{[1
,2
]}

Naumov, Anton V. ^{[4
,5
]}

Gao, Wei ^{[5
]}

Ci, Lijie ^{[3
]}

Ajayan, Anakha ^{[3
]}

Gao, Hui ^{[3
]}

Srivastava, Anchal ^{[6
]}

Weisman, R. Bruce ^{[5
]}

Ajayan, Pulickel M. ^{[3
,5
]}

机构：

[1] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA

[3] Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77005 USA

[4] Rice Univ, Appl Phys Program, Houston, TX 77005 USA

[5] Rice Univ, Dept Chem, Houston, TX 77005 USA

[6] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India

来源：

SCIENTIFIC REPORTS | 2011年 / 1卷

基金：

美国国家科学基金会;

关键词：

GRAPHITE OXIDE; REDUCTION;

D O I：

10.1038/srep00085

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：

Aqueous dispersions of graphene oxide (GO) have been found to emit a structured, strongly pH-dependent visible fluorescence. Based on experimental results and model computations, this is proposed to arise from quasi-molecular fluorophores, similar to polycyclic aromatic compounds, formed by the electronic coupling of carboxylic acid groups with nearby carbon atoms of graphene. Sharp and structured emission and excitation features resembling the spectra of molecular fluorophores are present near 500 nm in basic conditions. The GO emission reversibly broadens and red-shifts to ca. 680 nmin acidic conditions, while the excitation spectra remain very similar in shape and position, consistent with excited state protonation of the emitting species in acidic media. The sharp and structured emission and excitation features suggest that the effective fluorophore size in the GO samples is remarkably well defined.

引用

页数：5

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