Title

Ferric-sulfate-catalysed hot filament chemical vapour deposition carbon nanotube synthesis

Authors

Authors

A. Hussain

Comments

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Abbreviated Journal Title

Nanotechnology

Keywords

GROWTH; SULFUR; PARTICLES; FIBERS; NICKEL; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied

Abstract

This paper reports on the first use of a sulfur-containing substrate catalyst (ferric sulfate) in a hot filament chemical vapour deposition (HFCVD) reactor for carbon nanotube synthesis. The study combines three attractive features concerning catalysis, nucleation, and morphological control of nanotube growth in this context. First, it involves enhancement of iron's catalysis action by sulfur, proven effective previously in a similar capacity in chemical vapour deposition (CVD) studies not involving a hot filament. Second, it involves reduction of an iron compound with atomic hydrogen in the HFCVD reactor, which, through production of a fine dispersion of reduced substrate iron particles is a facilitating step in carbon nanotube nucleation. Third, for control of carbon nanotube morphology, it uses the CVD variables method, which uses the inherent capabilities of changes in CVD variables to control the growth morphology of carbon nanotubes. It is demonstrated in this report that the combination of these attractive features has enabled us to produce both randomly oriented and vertically aligned carbon nanotubes.

Journal Title

Nanotechnology

Volume

14

Issue/Number

8

Publication Date

1-1-2003

Document Type

Article

Language

English

First Page

925

Last Page

930

WOS Identifier

WOS:000185294100024

ISSN

0957-4484

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