采用化学气相沉积法(CVD),在溅射了镍薄膜的硅基底上制备了定向碳纳米管薄膜.对镍薄膜的氨气预处理过程及其机理进行了研究.结果发现预处理后的岛状区域随着薄膜厚度的增加而增加,纳米粒子区域的变化则与之相反.对5nm的镍薄膜进行预处理能获得细化和均匀分布的纳米粒子,有利于定向碳纳米管的生长.碳纳米管的生长过程及其细微结构与温度有很大关系.碳源的分解、碳原子在催化剂内部的扩散以及催化剂粒子的团聚三者之间的竞争决定了碳纳米管的生长情况.本文分析了碳纳米管的顶部生长模式及该模式下催化剂粒子的形态变化.
Aligned carbon nanotubes(CNTs)have been prepared using chemical vapor deposition(CVD)method on Ni-coated silicon substrates.The NH3 treatment of Ni films and its mechanism were investigated.It reveals that the amounts of island regions increase with the rising of Ni film thickness,but at the same time,the amounts of nanoparticles decrease.Pretreatment of Ni film with 5nm thickness can make catalyst particles distribute uniformly,which is favorite to the growth of aligned CNTs.The growth behavior and micro-structure of CNTs are strongly dependent on growth temperature.The competition among the decomposition of carbon source,diffusion of carbon atom inside the catalyst and agglomeration of catalyst particles related to the temperature determine the growth of CNTs.The tip growth mode and the morphological changes of catalyst particles in the growth of aligned CNTs were described in detail.
参考文献
| [1] | Prithu Sharma;Prerit Ahuja .Recent advances in carbon nanotube-based electronics[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2008(10):2517-2526. |
| [2] | Gao, LJ;Peng, AP;Wang, ZY;Zhang, H;Shi, ZJ;Gu, ZN;Cao, GP;Ding, BZ .Growth of aligned carbon nanotube arrays on metallic substrate and its application to supercapacitors[J].Solid State Communications,2008(9/10):380-383. |
| [3] | A.Reyhani;S.Z.Mortazavi;A.Nozad Golikand;A.Z. Moshfegh;S. Mirershadi .The Effect Of Various Acids Treatment On The Purification and Electrochemical Hydrogen Storage Of Multi-walled Carbon Nanotubes[J].Journal of Power Sources,2008(2):539-543. |
| [4] | Xiaolong Song;Yongning Liu;Jiewu Zhu .Multi-walled carbon nanotubes produced by hydrogen DC arc discharge at elevated environment temperature[J].Materials Letters,2007(2):389-391. |
| [5] | Shen Zhu;Ching-Hua Su;J.C. Cochrane .Growth of carbon nanostructure materials using laser vaporization[J].Diamond and Related Materials,2001(3-7):1190-1194. |
| [6] | Nxumalo EN;Nyamori VO;Coville NJ .CVD synthesis of nitrogen doped carbon nanotubes using ferrocene/aniline mixtures[J].Journal of Organometallic Chemistry,2008(17):2942-2948. |
| [7] | J.L. Kang;J.J. Li;X.W. Du .Synthesis and growth mechanism of metal filled carbon nanostructures by CVD using Ni/Y catalyst supported on copper[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):290-296. |
| [8] | Hofmann S;Cantoro M;Kleinsorge B;Casiraghi C;Parvez A;Robertson J;Ducati C .Effects of catalyst film thickness on plasma-enhanced carbon nanotube growth[J].Journal of Applied Physics,2005(3):4308-1-4308-8-0. |
| [9] | Low-temperature growth of carbon nanotubes by plasma-enhanced chemical vapor deposition[J].Applied physics letters,2003(1):135-137. |
| [10] | M. H. Kuang;Z. L. Wang;X. D. Bai .Catalytically active nickel {110} surfaces in growth of carbon tubular structures[J].Applied physics letters,2000(10):1255-1257. |
| [11] | Wang YY;Gupta S;Nemanich RJ .Role of thin Fe catalyst in the synthesis of double- and single-wall carbon nanotubes via microwave chemical vapor deposition[J].Applied physics letters,2004(13):2601-2603. |
| [12] | Arabczyk W.;Narkiewicz U. .A new method for in situ determination of number of active sites in iron catalysts for ammonia synthesis and decomposition[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2002(1/4):423-428. |
| [13] | Wang BB;Lee S;Xu XZ;Choi SH;Yan H;Zhang B;Hao W .Effects of the pressure on growth of carbon nanotubes by plasma-enhanced hot filament CVD at low substrate temperature[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2004(1/4):6-12. |
| [14] | Terrones M.;Zhang JP.;Terrones H.;Olivares J.;Hsu WK. Hare JP.;Cheetham AK.;Kroto HW.;Walton DRM.;Grobert N. .Preparation of aligned carbon nanotubes catalysed by laser-etched cobalt thin films[J].Chemical Physics Letters,1998(5-6):299-305. |
| [15] | Harris PJF.;Tsang SC. .A simple technique for the synthesis of filled carbon nanoparticles[J].Chemical Physics Letters,1998(1/2):53-58. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%