Isotope engineering of carbon nanotube systems.
Isotope engineering of carbon nanotube systems.
复制标题
碳纳米管系统的同位素工程。
DOI：
10.1103/physrevlett.95.017401
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发表时间：
2004
影响因子：
8.6
通讯作者：
H. Alloul
中科院分区：
文献类型：
--
作者：
F. Simon;C. Kramberger;R. Pfeiffer;H. Kuzmany;V. Zólyomi;J. Kürti;Philip M. Singer;H. Alloul
据报道，从封装在单壁碳纳米管 (SWCNT) 中的富同位素富勒烯合成了一种独特的同位素工程系统，即具有天然碳外壁和高度富含 13C 内壁的双壁碳纳米管。该材料允许观察高度无缺陷的内管的 D 线，这可能与电子声子耦合的曲率诱导增强有关。从头计算解释了由于不同同位素的分布而导致的内管拉曼模式的不均匀展宽。核磁共振显示，与其他碳相相比，同位素富集的内部单壁碳纳米管存在显着对比，并提供了内管质量含量的宏观测量。小直径内管的高曲率表现为化学位移张量分量的分布增加。
The synthesis of a unique isotope engineered system, double-wall carbon nanotubes with natural carbon outer and highly 13C enriched inner walls, is reported from isotope enriched fullerenes encapsulated in single-wall carbon nanotubes (SWCNTs). The material allows the observation of the D line of the highly defect-free inner tubes that can be related to a curvature induced enhancement of the electron-phonon coupling. Ab initio calculations explain the inhomogeneous broadening of inner tube Raman modes due to the distribution of different isotopes. Nuclear magnetic resonance shows a significant contrast of the isotope enriched inner SWCNTs compared to other carbon phases and provides a macroscopic measure of the inner tube mass content. The high curvature of the small diameter inner tubes manifests in an increased distribution of the chemical shift tensor components.