Fluorine-introduced sp3-carbon sites in a nano-sized π-electron system and their effects on the electronic properties

被引:16
作者
Takai, K [1 ]
Sato, H
Enoki, T
Yoshida, N
Okino, F
Touhara, H
Endo, M
机构
[1] Tokyo Inst Technol, Dept Chem, Tokyo 1528551, Japan
[2] Shinshu Univ, Fac Text Sci & Technol, Nagano 3868567, Japan
[3] Shinshu Univ, Fac Engn, Wakasato, Nagono 3808553, Japan
来源
MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2000年 / 340卷
关键词
activated carbon fibers; nano-sized graphite; pi-electron conjugated systems; sp(2)/sp(3) mixed carbon; fluorination; orbital diamagnetism;
D O I
10.1080/10587250008025481
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Activated carbon fibers (ACFs) are microporous systems comprised of a random network of nano-sized graphites. We investigated the structure and electronic properties of fluorinated ACFs in order to clarify the effects of fluorine-introduced sp(3)-carbon sites on the electronic state of the nano-sized pi-electron system. The orbital diamagnetism is monotonically reduced with increasing F/C, suggesting that introduced sp(3) carbon sites make the extended n-conjugated system reduced. In the intermediate fluorine concentration region, the localized spin concentration is enhanced by fluorination, reaching a maximum at F/C similar to 0.8, whereas it tends to be lowered in the high concentration region. The enhancement in the spin concentration is explained in terms of the local destruction of the pi-conjugated system at interior carbon sites by fluorine-inherited sp(3)-carbon sites.
引用
收藏
页码:289 / 294
页数:6
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