Isotope engineering of carbon nanotube systems

2020-03-07 02:12:38

carbon inner nanotubes enriched isotope

责任者: Simon, F.;Kramberger, Ch.;Pfeiffer, R.;Kuzmany, H.;Zolyomi, V.;Kurti, J.;Singer, P.M.;Alloul, H. 单位: Inst. fur Mater.physik, Univ. Wien, Austria 来源出处: Physical Review Letters(Phys. Rev. Lett. (USA)),2005/07/01,95(1):017401-1 摘要: 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 关键词: ab initio calculations;carbon nanotubes;chemical shift;electron-phonon interactions;nuclear magnetic resonance;Raman spectra;double-wall carbon nanotubes;natural carbon outer walls;highly 13C enriched inner walls;isotope enriched fullerenes;defect-free inner tubes;electron-phonon coupling;ab initio calculations;Raman modes;NMR;inner tube mass content;chemical shift tensor;isotope engineering;C