Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 11, 2018
Previous Article Next Article

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

Author affiliations

Abstract

We have juxtaposed the structural, vibrational and emission properties of graphene oxide (GO) with 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 the as prepared and reduced samples. –OH groups are predominantly effected by the photo-thermal reduction. Also we note some regeneration of [double bond splayed left]C[double bond, length as m-dash]O and –COOH groups in reduced samples. 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, unveiling 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 those of the 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 a dispersant provides crucial insights into the fundamental understanding of various molecular processes.

Graphical abstract: Associative behaviour and effect of functional groups on the fluorescence of graphene oxide

Back to tab navigation

Supplementary files

Article information


Submitted
12 Dec 2017
Accepted
06 Feb 2018
First published
06 Feb 2018

Phys. Chem. Chem. Phys., 2018,20, 7559-7569
Article type
Paper

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

S. Ozcan, S. Vempati, A. Çırpan and T. Uyar, Phys. Chem. Chem. Phys., 2018, 20, 7559
DOI: 10.1039/C7CP08334C

Social activity

Search articles by author

Spotlight

Advertisements