CUED Publications database

Electronic properties and atomic structure of graphene oxide membranes

Pacilé, D and Meyer, JC and Fraile Rodríguez, A and Papagno, M and Gómez-Navarro, C and Sundaram, RS and Burghard, M and Kern, K and Carbone, C and Kaiser, U (2011) Electronic properties and atomic structure of graphene oxide membranes. Carbon, 49. pp. 966-972. ISSN 0008-6223

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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. © 2010 Elsevier Ltd. All rights reserved.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:24
Last Modified: 22 Dec 2014 01:19
DOI: 10.1016/j.carbon.2010.09.063