Synthesis and growth mechanism of carbon filaments synthesized by chemical vapor deposition without catalyst

J. Mater. Sci. Technol. ›› 2009, Vol. 25 ›› Issue (02): 259-263.

Synthesis and growth mechanism of carbon filaments synthesized by chemical vapor deposition without catalyst

刘树和¹;李峰²;白朔²

1. 中科院金属研究所
2. 中国科学院金属研究所

收稿日期:2008-03-12 修回日期:2008-05-05 出版日期:2009-03-28 发布日期:2009-10-10
通讯作者: 白朔

Synthesis and Growth Mechanism of Carbon Filaments by Chemical Vapor Deposition without Catalyst

Shuhe Liu, Feng Li and Shuo Bai^†

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2008-03-12 Revised:2008-05-05 Online:2009-03-28 Published:2009-10-10
Contact: Shuo Bai

摘要/Abstract

摘要：

热解炭是一种传统的用途广泛的炭材料，广泛用于包覆核反应堆粒子，致密炭/炭复合材料、制造假肢和心脏瓣膜等。热解炭的制备通常是以碳氢气体为碳源，采用化学气相沉积的方法。虽然热解炭已有广泛的工业应用，但是由于反应和中间物种的复杂性以及无法原位观察到反应瞬间生成的物种，它的沉积机理还有争论。最近，在研究纳米碳管的过程中，采用不同的CVD路线，人们制备了一些新颖的炭结构，如碳微米树、杈状碳树和纳米碳纤维等。可是这些方法主要是采用过度金属或其前驱体作为催化剂。无催化剂CVD法制备丝状炭的报道较少，其生长机理目前也很模糊。由于热解炭的性能对其结构的依赖性，因此所需结构的热解炭的可控制备是非常重要的。由于丝状炭具有可比较的结构和明确的沉积过程，对这一奇特形式的炭材料进行研究可以帮助我们理解热解炭的沉积机理，通过控制沉积过程参数制备出具有特殊性能的所需结构的热解炭材料。这里，我们报道了无催化剂方法热解甲烷制备微米直径的丝状炭的制备条件、形貌、结构、生长机理和力学性能。

关键词: 丝状炭;热解炭;合成;化学气相沉积;力学性能

Abstract:

Carbon filaments with diameter from several to hundreds micrometers were synthesized by chemical vapor deposition of methane without catalyst. The morphology, microstructure and mechanical properties of the carbon filament were investigated by scanning electronic microscopy, optical microscopy, X-ray diffraction and mechanical testing. The results show that the carbon filament is inverted cone shape and grows up along the gas flow direction. The stem of it is formed of annular carbon layers arranged in a tree ring structure while the head is made up of concentrical layers. The tensile strength of the carbon filament is increased after graphitization for the restructuring and growing large of graphene. The growth mechanism of carbon filament was proposed according to the results of two series of experiments with different deposition time and intermittent deposition cycles.

Key words: Carbon filaments, Pyrolytic carbon, Synthesis, Chemical vapor deposition, Mechanical property

刘树和李峰白朔. Synthesis and growth mechanism of carbon filaments synthesized by chemical vapor deposition without catalyst[J]. J. Mater. Sci. Technol., 2009, 25(02): 259-263.

Shuhe Liu,Feng Li,Shuo Bai. Synthesis and Growth Mechanism of Carbon Filaments by Chemical Vapor Deposition without Catalyst[J]. J Mater Sci Technol, 2009, 25(02): 259-263.

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