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High emission currents and low threshold fields in multi-wall carbon nanotube-polymer composites in the vertical configuration

Sameera, I and Bhatia, Ravi and Prasad, V and Menon, Reghu (2012) High emission currents and low threshold fields in multi-wall carbon nanotube-polymer composites in the vertical configuration. In: Journal of Applied Physics, 111 (4).

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Abstract

In this work, we present field emission characteristics of multi-wall carbon nanotube (MWCNT)-polystyrene composites at various weight fractions along the cross-section of sample. Scanning electron microscope images in cross-sectional view reveal that MWCNTs are homogeneously distributed across the thickness and the density of protruding tubes can be scaled with weight fraction of the composite film. Field emission from composites has been observed to vary considerably with density of MWCNTs in the polymer matrix. High current density of 100 mA/cm(2) was achieved at a field of 2.2 V/lm for 0.15 weight fraction. The field emission is observed to follow the Fowler-Nordheim tunneling mechanism, however, electrostatic screening is observed to play a role in limiting the current density at higher weight fractions. (C) 2012 American Institute of Physics. [doi:10.1063/1.3685754]

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 10 Apr 2012 07:35
Last Modified: 10 Apr 2012 07:35
URI: http://eprints.iisc.ernet.in/id/eprint/44168

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