快速生长超长定向碳纳米管阵列的制备及机理
Preparation and growth mechanism of fast growing macroscopical long aligned carbon nanotube arrays
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摘要: 采用一种无模板的化学气相沉积法裂解金属有机物，以二茂铁为催化剂，二甲苯为碳源，利用单温炉加热装置在100 min内成功制备了2.7 mm超长定向碳纳米管阵列，生长速率高达27 μm·min-1。运用扫描电子显微镜、透射电子显微镜、拉曼光谱对定向碳纳米管阵列进行形貌观察和表征，结果表明:制得的碳纳米管阵列具有优越的定向性和管结构,并且石墨化程度高。给出了快速生长超长定向碳纳米管阵列的优化制备条件,结合表征结果讨论了碳纳米管阵列的生长机制，认为超长碳纳米管阵列采用的是一种催化剂固定不动的开口生长方式，碳源和催化剂的连续供应保证了超长碳纳米管阵列的快速生长。Abstract: The macroscopical long aligned carbon nanotube arrays(ACNTs) with a thickness of 2.7 mm were prepared by the pyrolysis of organometallic mixtures in 100 min using ferrocene and xylene as catalyzer and carbon source. Using a chemical vapor deposited with no template, the grow rate reached 27 μm·min-1. This process was carried out in a single-furnace system. The products were characterized by scanning electron microscopy (SEM) , transmission electron microscopy(TEM) and Raman spectroscopy. The results indicate that ACNTs have good alignment and fine graphite form. Both the optimized process parameters and the formation mechanism of fast growing macroscopical long ACNTs were summarized. A formation mechanism which the catalyst remains stable and the open ends was adopted, the rapid growth
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Key words:
- aligned /
- carbon nanotube arrays /
- fast growing /
- mechanism /
- chemical vapor deposition
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