Isotope engineering of carbon anotube systems

2019-09-26 20:04:40

The carbon inner nanotubes enriched

责任者: Simon, F.;Kramberger, Ch.;Pfeiffer, R.;Kuzmany, H.;Zolyomi, V.;Kurti, J.;Singer, P.M.;Alloul, H. 单位: Institut Fu Materialphysik, Universitat Wien, A-1090 Wien, Austria 来源出处: Physical Review Letters,2005,95(1):1-4 摘要: The synthesis of a unique isotope engineered system, double-wall carbon nanotubes with natural carbon outer and highly C13 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. © 2005 The American Physical Society. 关键词: Carbon nanotubes;Isotopes;Synthesis (chemical);Fullerenes;Encapsulation;Electrons;Phonons;Raman scattering;Nuclear magnetic resonance;Tensors;Single-wall carbon nanotubes (SWCNTs);Electron-phonon coupling;Ab initio calculations;Isotope engineering