X-ray absorption and photoelectron spectroscopy studies on graphite and single-walled carbon nanotubes: Oxygen effect

被引：63
作者：
Abbas, M
Wu, ZY
Zhong, J
Ibrahim, K
Fiori, A
Orlanducci, S
Sessa, V
Terranova, ML
Davoli, I
机构：
[1] Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100039, Peoples R China
[2] Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00173 Rome, Italy
[3] Univ Roma Tor Vergata, INFM, I-00173 Rome, Italy
[4] Natl Ctr Nanosci & Nanotechnol, Beijing 100080, Peoples R China
[5] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
来源：
APPLIED PHYSICS LETTERS | 2005年 / 87卷 / 05期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.2006214
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated the electronic states of highly oriented pyrolitic graphite and single-walled carbon nanotubes using x-ray absorption spectroscopy (XAS) before and after annealing treatment in ultrahigh vacuum, and observed that the small peak between pi(*) and sigma(*) features, which has been previously assigned to free-electron-like interlayer states, disappears after in situ annealing treatment, suggesting that the signal may be assigned to a surface contamination, especially oxygen contamination introduced by chemical processing or gas adsorption. Additional experiments by photoelectron spectroscopy as well as XAS methods, performed after aging in air, fully support this interpretation. (c) 2005 American Institute of Physics.
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