能源化学(英文) ›› 2015, Vol. 21 ›› Issue (4): 407-415.

• ARTICLES • 上一篇    下一篇

A reevaluation of the correlation between the synthesis parameters and structure and properties of nitrogen-doped carbon nanotubes

Kunpeng Xiea, Fengkai Yanga, Petra Ebbinghausb, Andreas Erbeb, Martin Muhlera, Wei Xiaa   

  1. a Laboratory of Industrial Chemistry, Ruhr-University Bochum, 44780 Bochum, Germany;
    b Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
  • 收稿日期:2015-03-30 修回日期:2015-06-30 发布日期:2015-08-21
  • 通讯作者: Wei Xia
  • 基金资助:

    This work is supported by the German Federal Ministry of Education and Research (BMBF) through the Project “CarboElch” (Grant 03X0207C) within the scope of the Inno.CNT Alliance, and the IMPRS-SurMat of the Max-Planck Society.

A reevaluation of the correlation between the synthesis parameters and structure and properties of nitrogen-doped carbon nanotubes

Kunpeng Xiea, Fengkai Yanga, Petra Ebbinghausb, Andreas Erbeb, Martin Muhlera, Wei Xiaa   

  1. a Laboratory of Industrial Chemistry, Ruhr-University Bochum, 44780 Bochum, Germany;
    b Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
  • Received:2015-03-30 Revised:2015-06-30 Published:2015-08-21
  • Contact: Wei Xia
  • Supported by:

    This work is supported by the German Federal Ministry of Education and Research (BMBF) through the Project “CarboElch” (Grant 03X0207C) within the scope of the Inno.CNT Alliance, and the IMPRS-SurMat of the Max-Planck Society.

摘要: Nitrogen-doped carbon nanotubes (NCNTs) were synthesized by chemical vapor deposition using cobaltbased oxides as catalyst and ethylenediamine (EDA) as carbon/nitrogen precursor. The influence of growth time, EDA concentration and growth temperature on the morphology, yield, composition, graphitization and oxidation resistance of the NCNTs was systematically investigated by using Raman spectroscopy, temperature-programmed oxidation and other techniques. The NCNT growth from ethylenediamine with a high N/C ratio involves several processes including mainly (1) catalytic growth of NCNTs, (2) homogeneous gas-phase decomposition of EDA, (3) non-catalytic deposition of pyrolytic carbon/nitrogen species and (4) surface etching of amorphous carbon or carbon at defect sites through gasification. At a later growth stage the etching process appears to be dominating, leading to the thinning of nanotubes and the decrease of yield. Moreover, the surface etching through carbon gasification strongly influences the structure and degree of graphitization of NCNTs.

关键词: Carbon nanotubes, Nitrogen-doping, Catalytic chemical vapor deposition, Ethlyenediamine, Carbon gasification

Abstract: Nitrogen-doped carbon nanotubes (NCNTs) were synthesized by chemical vapor deposition using cobaltbased oxides as catalyst and ethylenediamine (EDA) as carbon/nitrogen precursor. The influence of growth time, EDA concentration and growth temperature on the morphology, yield, composition, graphitization and oxidation resistance of the NCNTs was systematically investigated by using Raman spectroscopy, temperature-programmed oxidation and other techniques. The NCNT growth from ethylenediamine with a high N/C ratio involves several processes including mainly (1) catalytic growth of NCNTs, (2) homogeneous gas-phase decomposition of EDA, (3) non-catalytic deposition of pyrolytic carbon/nitrogen species and (4) surface etching of amorphous carbon or carbon at defect sites through gasification. At a later growth stage the etching process appears to be dominating, leading to the thinning of nanotubes and the decrease of yield. Moreover, the surface etching through carbon gasification strongly influences the structure and degree of graphitization of NCNTs.

Key words: Carbon nanotubes, Nitrogen-doping, Catalytic chemical vapor deposition, Ethlyenediamine, Carbon gasification