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High-yield synthesis of carbon coils on tungsten substrates and their behavior in the presence of an electric field

Published online by Cambridge University Press:  31 January 2011

Jun Jiao ,
Erik Einarsson ,
David W. Tuggle ,
Logan Love ,
Josie Prado  and
George M. Coia
Jun Jiao
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207
Erik Einarsson
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207
David W. Tuggle
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207
Logan Love
Affiliation:
Department of Physics, Portland State University, Portland, Oregon 97207
Josie Prado
Affiliation:
Department of Chemical Engineering, Oregon State University, Corvallis, Oregon 97331
George M. Coia
Affiliation:
Department of Chemistry, Portland State University, Portland, Oregon 97207
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Abstract

We report an effective procedure for fabricating carbon microcoils and nanocoils with three-dimensional spiral structures in high yield by nickel (Ni)-catalyzed thermal decomposition of acetylene. The Ni catalyst particles used in this preparation were electrochemically deposited onto tungsten substrates. Springlike coils having low pitch and micrometer-scale diameters and ropelike coils having higher pitch and nanometer-scale diameters were observed. Electrical and optical properties were investigated by employing a field-emission probe system equipped with an optical spectrometer. In an applied field above 1.5 V/μm, significant electron emission was observed from individual ropelike nanocoils. The approximately linear slope of the corresponding Fowler-Nordheim plot denotes predominately field-emission behavior. During measurement, individual carbon coils aligned themselves along the electric field, exhibiting a natural resonance on some occasions. As the field strength increased above 2.5 V/μm, the emission-current density for a single nanocoil was measured to be on the order of 104 A/cm2. This high-current density caused Joule heating, resulting in strong photon emission by incandescence.

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Type
Articles
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Journal of Materials Research , Volume 18 , Issue 11 , November 2003 , pp. 2580 - 2587
Copyright
Copyright © Materials Research Society 2003

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References

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