Effect of mixture ratios and nitrogen carrier gas flow rates on the morphology of carbon nanotube structures grown by CVD

被引:27
作者
Malgas, Gerald Franky [1 ]
Arendse, Christopher J. [1 ]
Cele, Nonhlanhla P. [1 ,2 ]
Cummings, Franscious R. [1 ,3 ]
机构
[1] CSIR, Natl Ctr Nanostruct Mat, ZA-0001 Pretoria, South Africa
[2] Univ Zululand, Dept Phys & Engn, ZA-3886 Kwa Dlangezwa, South Africa
[3] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa
关键词
D O I
10.1007/s10853-007-2230-5
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report on the growth of carbon nanotubes (CNTs) by thermal Chemical Vapor Deposition (CVD) and investigate the effects of nitrogen carrier gas flow rates and mixture ratios on the morphology of CNTs on a silicon substrate by vaporizing the camphor/ferrocene mixture at 750 degrees C in a nitrogen atmosphere. Carbon layers obtained after each CVD growth run of 15 min are characterized by scanning electron microscopy (SEM) and Raman spectroscopy. Growth of CNTs is found to occur on silicon substrates. The SEM micrographs helped better understand the nanotube growth morphology while Raman Spectroscopy was used to detect the presence of nanotubes and also identify their nature vizely semiconducting or metallic, single-walled or multi-walled. Raman Spectra was also useful to estimate the quality of the samples as a ratio of nanotube to non-nanotube content. The length and diameters of the aligned CNTs were found to depend on the pyrolysis temperatures, mixture ratio, and the nitrogen carrier gas flow rates.
引用
收藏
页码:1020 / 1025
页数:6
相关论文
共 20 条
[1]   Continuous production of aligned carbon nanotubes: a step closer to commercial realization [J].
Andrews, R ;
Jacques, D ;
Rao, AM ;
Derbyshire, F ;
Qian, D ;
Fan, X ;
Dickey, EC ;
Chen, J .
CHEMICAL PHYSICS LETTERS, 1999, 303 (5-6) :467-474
[2]   Organic light-emitting diodes with a bipolar transport layer [J].
Choong, VE ;
Shi, S ;
Curless, J ;
Shieh, CL ;
Lee, HC ;
So, F ;
Shen, J ;
Yang, J .
APPLIED PHYSICS LETTERS, 1999, 75 (02) :172-174
[3]   Synthesis of aligned carbon nanotubes [J].
Huczko, A .
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2002, 74 (05) :617-638
[4]   HELICAL MICROTUBULES OF GRAPHITIC CARBON [J].
IIJIMA, S .
NATURE, 1991, 354 (6348) :56-58
[5]   Large-scale production of single-walled carbon nanotubes by the electric-arc technique [J].
Journet, C ;
Maser, WK ;
Bernier, P ;
Loiseau, A ;
delaChapelle, ML ;
Lefrant, S ;
Deniard, P ;
Lee, R ;
Fischer, JE .
NATURE, 1997, 388 (6644) :756-758
[6]   A simple method of producing aligned carbon nanotubes from an unconventional precursor - Camphor [J].
Kumar, M ;
Ando, Y .
CHEMICAL PHYSICS LETTERS, 2003, 374 (5-6) :521-526
[7]   Raman characterization of aligned carbon nanotubes produced by thermal decomposition of hydrocarbon vapor [J].
Li, WZ ;
Zhang, H ;
Wang, CY ;
Zhang, Y ;
Xu, LW ;
Zhu, K ;
Xie, SS .
APPLIED PHYSICS LETTERS, 1997, 70 (20) :2684-2686
[8]   Mass production of high-quality multi-walled carbon nanotube bundles on a Ni/Mo/MgO catalyst [J].
Li, Y ;
Zhang, XB ;
Tao, XY ;
Xu, JM ;
Huang, WZ ;
Luo, JH ;
Luo, ZQ ;
Li, T ;
Liu, F ;
Bao, Y ;
Geise, HJ .
CARBON, 2005, 43 (02) :295-301
[9]   Reduction of solubilized multi-walled carbon nanotubes [J].
Liu, LQ ;
Qin, YJ ;
Guo, ZX ;
Zhu, DB .
CARBON, 2003, 41 (02) :331-335
[10]   STRUCTURAL INVESTIGATION OF XENON-ION-BEAM-IRRADIATED GLASSY-CARBON [J].
MCCULLOCH, DG ;
PRAWER, S ;
HOFFMAN, A .
PHYSICAL REVIEW B, 1994, 50 (09) :5905-5917