Quasi-Molecular Fluorescence from Graphene Oxide View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2011-12

AUTHORS

Charudatta Galande, Aditya D. Mohite, Anton V. Naumov, Wei Gao, Lijie Ci, Anakha Ajayan, Hui Gao, Anchal Srivastava, R. Bruce Weisman, Pulickel M. Ajayan

ABSTRACT

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 nm in 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. More... »

PAGES

85

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/srep00085

DOI

http://dx.doi.org/10.1038/srep00085

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1007773297

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/22355604


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