Synthesis of nitrogen-doped single-walled carbon nanotubes and monitoring of doping by Raman spectroscopy

作     者：吴慕鸿 李晓 潘鼎 刘磊 杨晓霞 许智 王文龙 隋郁 白雪冬 

作者机构：Department of Physics Harbin Institute of Technology Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences International Center for Quantum Materials School of Physics Peking University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2013年第22卷第8期

页      面：215-220页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11004230,51172273,11290161,and 11027402) the National Key Basic Research Program of China(Grant Nos.2012CB933003 and 2013CB932603) the Innovative Project of the Chinese Academy of Sciences(GrantNo.KJCX2-YW-W35) 

主　　题：single-walled carbon nanotubes nitrogen doping chemical vapor deposition Raman spectroscopy 

摘      要：Nitrogen-doped single-walled carbon nanotubes （CNx-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 nan- otubes 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.