Growth dynamics of vertically aligned single-walled carbon nanotubes from in situ measurements
Growth dynamics of vertically aligned single-walled carbon nanotubes from in situ measurements
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DOI：
10.1016/j.carbon.2008.02.021
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发表时间：
2008-05-01
期刊：
影响因子：
10.9
通讯作者：
Maruyama, Shigeo
中科院分区：
文献类型：
--
作者：
Einarsson, Erik;Murakami, Yoichi;Maruyama, Shigeo
采用原位光吸收法研究了乙醇化学气相沉积法制备的垂直取向单壁碳纳米管（VA-SWCNTs）的生长动力学。VA-单壁碳纳米管膜的生长速率被发现从初始最大值呈指数衰减，导致约15分钟的有效生长时间。各种生长条件的调查揭示了最佳的压力，在该压力下，生长最大化，这种压力取决于生长温度。低于该最佳压力，合成反应为一级反应，限速步骤是乙醇到达催化剂。我们还提出了一种新的方法来确定低质量材料的燃烧温度，它结合了原位吸光度测量与控制氧化。(C)2008爱思唯尔有限公司保留所有权利。
An in situ optical absorbance measurement was used to study the growth dynamics of vertically aligned single-walled carbon nanotubes (VA-SWCNTs) synthesized by chemical vapor deposition of ethanol. The growth rate of the VA-SWCNT film was found to decay exponentially from an initial maximum, resulting in an effective growth time of approximately 15 min. Investigation of various growth conditions revealed an optimum pressure at which growth is maximized, and this pressure depends on the growth temperature. Below this optimum pressure the synthesis reaction is first-order, and the rate-limiting step is the arrival of ethanol at the catalyst. We also present a novel method for determining the burning temperature of low-mass materials, which combines the in situ absorbance measurement with controlled oxidation. (C) 2008 Elsevier Ltd. All rights reserved.