Tuning of vertically-aligned carbon nanotube diameter and areal density through catalyst pre-treatment

Gilbert D. Nessim, A. John Hart, Jin S. Kim, Donatello Acquaviva, Jihun Oh, Caitlin D. Morgan, Matteo Seita, Jeffrey S. Leib, Carl V. Thompson

Research output: Contribution to journalArticlepeer-review

211 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)3587-3593
Number of pages7
JournalNano Letters
Volume8
Issue number11
DOIs
StatePublished - Nov 2008
Externally publishedYes

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