CUED Publications database

Field emission from laser cut CNT fibers and films

Fairchild, SB and Bulmer, JS and Sparkes, M and Boeckl, J and Cahay, M and Back, T and Murray, PT and Gruen, G and Lange, M and Lockwood, NP and Orozco, F and O'Neill, W and Paukner, C and Koziol, KKK (2014) Field emission from laser cut CNT fibers and films. Journal of Materials Research, 29. pp. 392-402. ISSN 0884-2914

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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 (E ext). Fiber cathode I-E ext data are interpreted as FN emission from the fiber tip which is eventually limited by space-charge effects. At higher E ext, 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. © Materials Research Society 2014.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div E > Production Processes
Div E > Manufacturing Systems
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:16
Last Modified: 19 Sep 2017 01:33
DOI: