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

被引：202

作者：

Nessim, Gilbert D. ^{[1
]}

Hart, A. John ^{[1
]}

Kim, Jin S. ^{[1
]}

Acquaviva, Donatello ^{[1
]}

Oh, Jihun ^{[1
]}

Morgan, Caitlin D. ^{[1
]}

Seita, Matteo ^{[1
]}

Leib, Jeffrey S. ^{[1
]}

Thompson, Carl V. ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

NANO LETTERS | 2008年 / 8卷 / 11期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1021/nl801437c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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-2 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.

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收藏

页码：3587 / 3593

页数：7

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