Tuning of Vertically-Aligned Carbon Nanotube Diameter and Areal Density through Catalyst Pre-Treatment

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• 作者：Gilbert D. Nessim ; A. John Hart ; Jin S. Kim ; Donatello Acquaviva ; Jihun Oh ; Caitlin D. Morgan ; Matteo Seita ; Jeffrey S. Leib ; Carl V. Thompson
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：November 12, 2008
• 年：2008
• 卷：8
• 期：11
• 页码：3587-3593
• 全文大小：303K
• 年卷期：v.8,no.11(November 12, 2008)
• ISSN：1530-6992

文摘

By controlling the timing and duration of hydrogen exposure in a fixed thermal process, we tuned the diameters of carbon nanotubes (CNTs) within a vertically aligned film by a factor of 2, and tuned the areal densities by an order of magnitude. The CNT structure is correlated with the catalyst morphology, suggesting that while chemical reduction of the catalyst layer is required for growth, prolonged H<sub>2sub> exposure not only reduces the iron oxide and enables agglomeration of the Fe film, but also leads to catalyst coarsening. Control of this coarsening process allows tuning of CNT characteristics.