Electronic properties and atomic structure of graphene oxide membranes |
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| Authors: | D Pacilé JC Meyer A Fraile Rodríguez M Papagno C Gómez-Navarro RS Sundaram M Burghard K Kern C Carbone U Kaiser |
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| Affiliation: | aDipartimento Fisica, Università della Calabria, and INFN-Gruppo collegato di Cosenza, 87036 Arcavacata di Rende (CS), Italy;bElectron Microscopy Group of Material Sciences, University of Ulm, D-89081 Ulm, Germany;cSwiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;dIstituto di Struttura della Materia-Consiglio Nazionale delle Ricerche, Basovizza, Trieste, Italy;eMax-Planck Institut fuer Festkoerperfoschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany;fDepartamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain;gEcole Polytechnique Fédérale de Lausanne, Institut de Physique de la Matière Condensée, 1015 Lausanne, Switzerland |
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| Abstract: | We have performed a near-edge X-ray absorption fine-structure (NEXAFS) and a transmission electron microscopy (TEM) investigation of freely suspended graphene oxide (GO) sheets. We utilized a photoemission electron microscope to identify GO membranes and to acquire C K and O K absorption spectra. The overall line shape of C K-edge spectra demonstrates that the honeycomb carbon network of graphene is the scaffold of GO. However, the intensity ratio of π∗ and σ∗ resonances, and a broad feature at about 20 eV from the edge, indicate the presence of new carbon bonds. The O K-edge spectra show that oxidized regions are made of carbonyl, epoxide, and hydroxyl groups attached to the plane of graphene, while carboxyl groups might also be present at the edges. Further, our study indicates the presence of ordered arrangements of oxygen atoms in GO sheets. Our investigation provides a new and efficient route to study the electronic structure of suspended membranes. |
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