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

Physical Chemistry Chemical Physics : PCCP
Sefika OzcanTamer Uyar

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 sp2domains 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...Continue Reading

References

Feb 13, 2007·Nature Materials·Simone PisanaFrancesco Mauri
Jan 9, 2008·Journal of the American Chemical Society·Hae-Kyung JeongYoung Hee Lee
Jul 26, 2008·Nature Nanotechnology·Dan LiGordon G Wallace
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May 25, 2012·Angewandte Chemie·Chih-Tao ChienChun-Wei Chen

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Citations

Feb 6, 2019·Biomaterials Science·André F GirãoPaula A A P Marques

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Methods Mentioned

BETA
FRET
X-ray
Fluorescence

Software Mentioned

Avantage
Origin

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