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Associative behaviour and role of functional groups on the fluorescence of graphene oxide

Abstract

We have juxtaposed structural, vibrational and emission properties of graphene oxide (GO) of various degrees of reduction with and without a model dispersant, unveiling a strong associative behavior between GO sheets and the influence of H-bonds. The interlayer spacings are ~0.84 and 0.78 nm for as prepared and reduced samples. Photo-thermal reduction method predominantly effected the -OH groups and mild regeneration of >C=O and -COOH groups. Clear changes to the phonon density of states indicated the doping effects due to H-bonds via the oxygeneous groups. Importantly, the defect related Raman bands are rather prone to the effect of dispersant unveilig their intrinsic nature. In the context of fluorescence, internal vibration relaxation mediated by CC stretch vibrations emphasized the localized nature of sp2 domains of relatively smaller size. Fluorescence consists of 6 components, where the higher energy components are more influenced due to H-bonds than that of lower energy regime, attributed to their associative behavior and chemical functionality, respectively. Excitation dependent fluorescence measurements indicated a range of optical gaps from ~3.5 to 2 eV. The associative behavior of GO and rGO with and without dispersant provides crucial insights into the fundamental understanding of various molecular processes.

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Publication details

The article was received on 12 Dec 2017, accepted on 06 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C7CP08334C
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Associative behaviour and role of functional groups on the fluorescence of graphene oxide

    S. Ozcan, S. Vempati, A. Cirpan and T. Uyar, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP08334C

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