Unoccupied electronic states in graphite oxides

被引：82

作者：

Jeong, Hae-Kyung ^{[1
]}

Colakerol, Leyla ^{[2
]}

Jin, Mei Hua ^{[1
]}

Glans, Per-Anders ^{[3
]}

Smith, Kevin E. ^{[2
]}

Lee, Young Hee ^{[1
]}

机构：

[1] Sungkyunkwan Univ, Sungkyunkwan Adv Inst Nanotechnol, Ctr Nanotubes & Nanostructured Composites, BK Phys Div 21, Suwon 440746, South Korea

[2] Boston Univ, Dept Phys, Boston, MA 02215 USA

[3] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

CHEMICAL PHYSICS LETTERS | 2008年 / 460卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2008.06.042

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Unoccupied electronic states of graphite oxides with different oxidation times have been investigated using X-ray absorption spectroscopy (XAS) in total electron yield (TEY) and total fluorescence yield (TFY) modes. The graphite oxides exhibit graphite-like sp(2) states with additional electronic states originating from functional groups. The intensity of the pi* state decreases as the atomic ratio O:C increases. The intensity ratio of carboxyl to pi* states in XAS TEY mode corresponds to the area ratio of carboxyl to sp(2) carbon in X-ray photoelectron spectroscopy. In addition, the two modes in XAS can identify electronic states of functional groups originating from surface or bulk regions. (c) 2008 Elsevier B. V. All rights reserved.

引用

页码：499 / 502

页数：4

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