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Issue 24, 2017
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Revealing the structure and functionality of graphene oxide and reduced graphene oxide/pyrene carboxylic acid interfaces by correlative spectral and imaging analysis

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Abstract

A high-end correlated spectral and imaging multianalysis, adapted for bidimensional systems, is presented here to analyze graphene oxide (GO) and reduced GO (rGO) modified with pyrene carboxylic acid (PCA). Confocal Raman mapping was used next to two-photon excited Fluorescence Lifetime Imaging Microscopy (FLIM) to characterize the distribution of PCA on GO and rGO and compared to UV-vis and X-ray Photoelectron Spectroscopy (XPS) analysis of the materials. Raman imaging clearly highlights the difference in the spatial distribution of PCA molecules on GO and rGO. Two-photon excited FLIM helped in gaining insight into the elusive phenomena and effects occurring at the GO–PCA interface level. Apart from the charge transfer effects from PCA molecules to GO, the GO structure depends on the molecular orientation and the spatial distribution of PCA molecules identified by different sp2 network domains in Raman mapping. Heating of GO–PCA results in an enhancement of the sp2 network presumably as the PCA aromatic core becomes fused into the GO nanosheets whilst enriching the resulting rGO nanosheets with carboxyl functionalities. This “healing” effect observed in rGO–PCA might be of high importance for applications using rGO–PCA matrices and interfaces in particular for electrical devices.

Graphical abstract: Revealing the structure and functionality of graphene oxide and reduced graphene oxide/pyrene carboxylic acid interfaces by correlative spectral and imaging analysis

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Publication details

The article was received on 14 Apr 2017, accepted on 23 May 2017 and first published on 24 May 2017


Article type: Paper
DOI: 10.1039/C7CP02443F
Citation: Phys. Chem. Chem. Phys., 2017,19, 16038-16046
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    Revealing the structure and functionality of graphene oxide and reduced graphene oxide/pyrene carboxylic acid interfaces by correlative spectral and imaging analysis

    D. Zaharie-Butucel, M. Potara, A. M. Craciun, R. Boukherroub, S. Szunerits and S. Astilean, Phys. Chem. Chem. Phys., 2017, 19, 16038
    DOI: 10.1039/C7CP02443F

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