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

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...

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Published inChinese physics B Vol. 22; no. 8; pp. 215 - 220
Main Author 吴慕鸿 李晓 潘鼎 刘磊 隋郁 白雪冬 杨晓霞 许智 王文龙
Format Journal Article
LanguageEnglish
Published 01.08.2013
Subjects
Band spectra
Carbon
Chemical vapor deposition
Concentration (composition)
Doping
Electron energy loss spectroscopy
Nanotubes
Phonons
Single wall carbon nanotubes
光谱监测
化学汽相淀积
单壁碳纳米管
合成
拉曼光谱
氮掺杂
电子显微镜
电子能量损失谱
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Summary: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.
Bibliography:Wu Mu-Hong, Li Xiao, Pan Ding, Liu Lei, Yang Xiao-Xia, Xu Zhi Wang Wen-Long, Sui Yu, and Bai Xue-Dong a）Department of Physics, Harbin Institute of Technology, Harbin 150001, China b ） Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China c） International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
single-walled carbon nanotubes, nitrogen doping, chemical vapor deposition, Raman spectroscopy
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.
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/22/8/086101