Electronic structures of single-walled carbon nanotubes determined by NMR

被引：189

作者：

Tang, XP

Kleinhammes, A

Shimoda, H

Fleming, L

Bennoune, KY

Sinha, S

Bower, C

Zhou, O

Wu, Y ^{[1
]}

机构：

[1] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[2] Univ N Carolina, Curriculum Appl & Mat Sci, Chapel Hill, NC 27599 USA

来源：

SCIENCE | 2000年 / 288卷 / 5465期

关键词：

D O I：

10.1126/science.288.5465.492

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Single-walled carbon nanotubes were studied by C-13 nuclear magnetic resonance (NMR). Two types of C-13 nuclear spins were identified with different spin-lattice relaxation rates. The fast-relaxing component, assigned to metallic tubes, followed the relaxation behavior expected in metals, and the density-of-states at the Fermi level increased with decreasing tube diameter. The slow-relaxing component has a significantly lower density-of-states at the Fermi level Exposure to oxygen has a substantial effect on relaxation rates of both components.

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页码：492 / 494

页数：3

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