Synthesis of nitrogen-doped single-walled carbon nanotubes and monitoring of doping by Raman spectroscopy |
| |
| Authors: | Wu Mu-Hong Li Xiao Pan Ding Liu Lei Yang Xiao-Xia Xu Zhi Wang Wen-Long |
| |
| Affiliation: | [1]Department of Physics, Harbin Institute of Technology, Harbin 150001, China [2]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [3]International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China |
| |
| Abstract: | Nitrogen-doped single-walled carbon nanotubes (CN x -SWNTs) with tunable dopant concentrations were synthesized by chemical vapor deposition (CVD), and their structure and elemental composition were characterized by using transmission electron microscopy (TEM) in combination with electron energy loss spectroscopy (EELS). By comparing the Raman spectra of pristine and doped nanotubes, we observed the doping-induced Raman G band phonon stiffening and 2D band phonon softening, both of which reflect doping-induced renormalization of the electron and phonon energies in the nanotubes and behave as expected in accord with the n-type doping effect. On the basis of first principles calculations of the distribution of delocalized carrier density in both the pristine and doped nanotubes, we show how the n-type doping occurs when nitrogen heteroatoms are substitutionally incorporated into the honeycomb tube-shell carbon lattice. |
| |
| Keywords: | single-walled carbon nanotubes nitrogen doping chemical vapor deposition Raman spectroscopy |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
