Growth Deceleration of Vertically Aligned Carbon Nanotube Arrays: Catalyst Deactivation or Feedstock Diffusion Controlled?

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• 作者：Rong Xiang ; Zhou Yang ; Qiang Zhang ; Guohua Luo ; Weizhong Qian ; Fei Wei ; Masayuki Kadowaki ; Erik Einarsson ; Shigeo Maruyama
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：April 3, 2008
• 年：2008
• 卷：112
• 期：13
• 页码：4892 - 4896
• 全文大小：126K
• 年卷期：v.112,no.13(April 3, 2008)
• ISSN：1932-7455

文摘

Feedstock and byproduct diffusion in the root growth of aligned carbon nanotube arrays is discussed. Anon-dimensional modulus is proposed to differentiate catalyst-poisoning controlled growth deceleration fromone which is diffusion controlled. It is found that, at the current stage, aligned multiwalled carbon nanotubearrays are usually free of feedstock diffusion resistance while single-walled carbon nanotube arrays are alreadysuffering from a strong diffusion resistance. The method presented here is also able to predict the criticallengths in different CVD processes from which carbon nanotube arrays begin to meet strong diffusion resistance,as well as the possible solutions to this diffusion caused growth deceleration.