Author ' s personal copy Electronic properties and atomic structure of graphene oxide membranes
Author ' s personal copy Electronic properties and atomic structure of graphene oxide membranes
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发表时间：
2010
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通讯作者：
D. Pacilè;J. C. Meyer;A. F. Rodríguez;M. Papagno;C. Gómez-Navarro;R. Sundaram;M. Burghard;K. Ker
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作者：
D. Pacilè;J. C. Meyer;A. F. Rodríguez;M. Papagno;C. Gómez-Navarro;R. Sundaram;M. Burghard;K. Ker
我们对自由悬浮的氧化石墨烯 (GO) 片进行了近边缘 X 射线吸收精细结构 (NEXAFS) 和透射电子显微镜 (TEM) 研究。我们利用光电发射电子显微镜来识别 GO 膜并获取 C K 和 O K 吸收光谱。 C K边光谱的整体线形表明石墨烯的蜂窝状碳网络是GO的支架。然而，p 和 r 共振的强度比以及距离边缘约 20 eV 的广泛特征表明存在新的碳键。 O K 边光谱表明，氧化区域由附着在石墨烯平面上的羰基、环氧基和羟基组成，而羧基也可能存在于边缘。此外，我们的研究表明 GO 片中存在氧原子的有序排列。我们的研究为研究悬浮膜的电子结构提供了一条新的有效途径。 2010 爱思唯尔有限公司保留所有权利。
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 p and r 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.