標題: Core-Level Shift of Graphene with Number of Layers Studied by Microphotoelectron Spectroscopy and Electrostatic Force Microscopy
作者: Lin, Chi-Yuan
Shiu, Hung-Wei
Chang, Lo-Yueh
Chen, Chia-Hao
Chang, Chen-Shiung
Chien, Forest Shih-Sen
光電工程學系
Department of Photonics
公開日期: 30-Oct-2014
摘要: The dependence of C-1s core-level shift (CLS) of graphene on the number of layer (NL) is significant information to derive the coordination-resolved C1s core-level energy (E-1s) of carbon allotropes. To observe the variation of CLS of graphene with NL, binding energy and work function of graphene with various NL were examined by scanning photoelectron microscopy/spectroscopy and electrostatic force microscopy. E1s of grounded graphene decreased as NL increased. The E-1s of single-layer graphene and multilayer graphene (MLG) is 289.42 and 289.13 eV, respectively. Based on the NL-dependent E1s of graphene, the CLS of C-1s between a free carbon atom and diamond is 0.74 eV, calculated by the bond-order-length-strength correlation theory. The CLS of graphene with NL supported the existence of surface core-level shift (SCLS) on graphite. The magnitude of SCLS in MLG was +0.09 eV. The effective coordination number is 3.68 for bilayer graphene and 4.31 for the surface carbon layer in MLG.
URI: http://dx.doi.org/10.1021/jp503649e
http://hdl.handle.net/11536/123957
ISSN: 1932-7447
DOI: 10.1021/jp503649e
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 118
Issue: 43
起始頁: 24898
結束頁: 24904
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