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Electrodeposition of Ni Catalyst on Tungsten Substrates and Its Effect on the Formation of Carbon Nano- and Micro-coils

Published online by Cambridge University Press:  11 February 2011

Erik Einarsson ,
Jun Jiao ,
Josie Prado ,
George M. Coia ,
Jeremy Petty  and
Logan Love
Erik Einarsson
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207, U.S.A.
Jun Jiao
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207, U.S.A.
Josie Prado
Affiliation:
Department of Chemical Engineering, Oregon State University Corvallis, Oregon 97331, U.S.A.
George M. Coia
Affiliation:
Department of Chemistry, Portland State University, Portland, Oregon 97207, U.S.A.
Jeremy Petty
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207, U.S.A.
Logan Love
Affiliation:
Department of Chemical Engineering, Oregon State University Corvallis, Oregon 97331, U.S.A.
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Abstract

Carbon micro-coils and nano-coils were produced in high yield from nickel catalyst particles electrochemically deposited onto tungsten substrates. Various electrochemical deposition techniques were used to produce the nickel catalyst particles. These particles catalyzed the chemical vapor deposition (CVD) of acetylene at 800°C, resulting in growth of carbon microand nano-coils. Linear-sweep (cyclic) voltammetry produced catalyst particles which resulted in single- filament coils intermixed with thin nanotubes over most of the substrate surface. Passing the same amount of charge by constant current electrolysis produced nickel particles that decomposed carbon but did not grow coils. Catalyst particles deposited by constant current electrolysis grew nanocoils similar to linear-sweep voltammetry but in small, localized, high-yield patches. The coils produced were either spring- like micro-coils of low pitch and large diameter or rope- like nano-coils of higher pitch and smaller diameter. High-resolution transmission electron microscopy (HRTEM) showed typical graphite fringes in the filaments, but did not reveal an internal tubular structure. Catalyst particles were often detected at the ends of the coils.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 740: Symposium I – Nanomaterials for Structural Applications , 2002 , I3.20
Copyright
Copyright © Materials Research Society 2003

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References

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