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Field emission from laser cut CNT fibers and films

Published online by Cambridge University Press:  22 November 2013

Steven B. Fairchild ,
John S. Bulmer ,
Martin Sparkes ,
John Boeckl ,
Marc Cahay ,
Tyson Back ,
P. Terrence Murray ,
Gregg Gruen ,
Matthew Lange  and
Nathaniel P. Lockwood
...Show all authors
Steven B. Fairchild
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433
John S. Bulmer
Affiliation:
Department of Materials Science & Metallurgy, University of Cambridge, Cambridge, CB3 0FS
Martin Sparkes
Affiliation:
Department of Engineering, Institute for Manufacturing, University of Cambridge, Cambridge, CB3 0FS
John Boeckl*
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433
Marc Cahay
Affiliation:
Spintronics and Vacuum Nanoelectronics Laboratory, University of Cincinnati, Cincinnati Ohio 45221
Tyson Back
Affiliation:
Research Institute, University of Dayton, Dayton, Ohio 45469-0170
P. Terrence Murray*
Affiliation:
Research Institute, University of Dayton, Dayton, Ohio 45469-0170
Gregg Gruen
Affiliation:
TechFlow Scientific, Albuquerque, New Mexico 87110
Matthew Lange
Affiliation:
TechFlow Scientific, Albuquerque, New Mexico 87110
Nathaniel P. Lockwood
Affiliation:
Directed Energy Directorate, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico 87117
Francisco Orozco
Affiliation:
Department of Engineering, Institute for Manufacturing, University of Cambridge, Cambridge, CB3 0FS
William O’Neill
Affiliation:
Department of Engineering, Institute for Manufacturing, University of Cambridge, Cambridge, CB3 0FS
Catharina Paukner
Affiliation:
Department of Materials Science & Metallurgy, University of Cambridge, Cambridge, CB3 0FS
Krzysztof K. K. Koziol
Affiliation:
Department of Materials Science & Metallurgy, University of Cambridge, Cambridge, CB3 0FS
*
b)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Field emission (FE) measurements are reported from carbon nanotube (CNT) fibers and laser-patterned free standing films fabricated by direct online condensation from a floating catalyst chemical vapor deposition reactor. Fiber and film cathodes showed stable emission in the 1–2 mA current (I) range at maximum cathode temperatures less than 1000 °C; film cathodes show localized heating at the triangular tips and higher maximum temperatures than the fibers. Fowler–Nordheim (FN) analysis indicated a change in the morphology of the emitters with increasing external electrical field (Eext). Fiber cathode I–Eext data are interpreted as FN emission from the fiber tip which is eventually limited by space-charge effects. At higher Eext, FN emission from the fiber sidewall occurs. The single fiber cathode stopped emitting abruptly when field induced self-heating effects became significant. For CNT films, self-heating effects can destroy a portion of the film, but FE can still occur from other areas.

Type
Invited Papers
Information
Journal of Materials Research , Volume 29 , Issue 3: Focus Issue: Graphene and Beyond , 14 February 2014 , pp. 392 - 402
Copyright
Copyright © Materials Research Society 2014 

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References

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