Large-scale CVD synthesis of nitrogen-doped multi-walled carbon nanotubes with controllable nitrogen content on a CoxMg1-xMoO4 catalyst

被引:65
作者
Tao, X. Y.
Zhang, X. B. [1 ]
Sun, F. Y.
Cheng, J. P.
Liu, F.
Luo, Z. Q.
机构
[1] Zhejiang Univ, State Key Lab Silicon Mat, Dept Mat Sci & Engn, Hangzhou 310027, Peoples R China
[2] Zhejiang Univ, Dept Mat Sci & Engn, Mat Phys & Microstruct Inst, Hangzhou 310027, Peoples R China
[3] Univ Sci & Technol China, Dept Chem, Struct Res Lab, Anhua 230026, Peoples R China
基金
中国国家自然科学基金;
关键词
carbon nanotube; chemical vapor deposition; catalyst; transmission electron microscopy;
D O I
10.1016/j.diamond.2006.08.019
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
High-purity nitrogen-doped multi-walled carbon nanotubes (MWCNTs) have been produced with a yield of more than 30 times the amount of the catalyst, using CoxMg1-xMoO4 as catalyst and a methane-hydrogen-ammonia mixture as precursor. By controlling the flow-rate of ammonia during the chemical vapor deposition, the nitrogen concentration of 0.6 at.% to 3.2 at.% was obtained. X-ray photoelectron spectroscopy reveals that three different structures of the nitrogen atoms are involved in the nitrogen-doped MWCNTs, among which a graphite-like structure is dominant in these MWCNTs. Thermal gravimetric analyses show that the purity of the as-prepared MWCNTs is over 95%. High-resolution transmission electron microscopy analyses indicate that the MWCNTs have high graphitization degree. Our experimental results showed that the CoxMg1-xMoO4 catalyst is ideal for the synthesis of high-quality nitrogen-doped MWCNTs because of its high catalytic activity. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:425 / 430
页数:6
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