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Issue 4, 2016
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Conjugated polyelectrolyte nano field emission adlayers

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Abstract

Here we report on a straightforward and rapid means of enhancing the field electron emission performance of nascent vertically aligned multi-walled carbon nanotubes by introducing a polar zwitterionic conjugated polyelectrolyte adlayer at the vacuum–emitter interface. We attribute the observed 66% decrease in turn-on electric field to the augmented emitter micro-morphology and shifted surface band structure. The composite emitters can be optically modulated by exploiting the absorption cross-section of the solution cast adlayer, which increases the local carrier concentration which broadens the effective electrostatic shape of the emitter during optical excitation. Assessment via scanning anode field emission microscopy reveals a 25% improvement in DC time stability, a significant reduction in long-term hysteresis shift, and a threefold increase in bandwidth during pulsed mode operation.

Graphical abstract: Conjugated polyelectrolyte nano field emission adlayers

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Supplementary files

Article information


Submitted
15 Apr 2016
Accepted
09 May 2016
First published
09 May 2016

This article is Open Access

Nanoscale Horiz., 2016,1, 304-312
Article type
Communication
Author version available

Conjugated polyelectrolyte nano field emission adlayers

M. T. Cole, R. J. Parmee, A. Kumar, C. M. Collins, M. H. Kang, J. Xiao, C. Cepek, X. Yuan and W. I. Milne, Nanoscale Horiz., 2016, 1, 304
DOI: 10.1039/C6NH00071A

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