Identifying the fluorescence of graphene oxide

Thomas, Helen R., Valles, Cristina, Young, Robert J., Kinlock, Ian A., Wilson, Neil R. and Rourke, Jonathan P. ORCID: https://orcid.org/0000-0002-8961-1021 2013. Identifying the fluorescence of graphene oxide. Journal of Materials Chemistry C Materials for optical and electronic devices 1 (2) , pp. 338-342. 10.1039/c2tc00234e

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Abstract

Treatment of graphene oxide (GO) with sodium hydroxide separates the material into two components: a colourless, but highly fluorescent, oxidative debris and a darker non-fluorescent material containing the graphene-like sheets. The as-produced GO shows a weak, broad photo-luminescence while the oxidative debris fluoresces more intensely, blue-shifted relative to the as-produced GO, with a dispersive emission profile shifting to lower wavelength as the excitation wavelength is decreased. Such excitation wavelength dependent photoluminescence is characteristic of ensembles of nanometre-sized carbon based fluorophores. By contrast, analysis of the fluorescence as a function of excitation wavelength for as-produced graphene oxide shows a single non-dispersive peak, consistent with broadening of the emission from a single species rather than an ensemble of quantum dots within the graphene sheet.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Publisher:	Royal Society of Chemistry
ISSN:	2050-7526
Date of Acceptance:	25 October 2012
Last Modified:	03 Apr 2023 14:30
URI:	https://orca.cardiff.ac.uk/id/eprint/155222

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