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Super hydrophobic SAM modified electrodes for enhanced current limiting properties in intrinsic conducting polymer surge protection devices

Jabarullah, Noor H.; Verrelli, Emanuele; Mauldin, Clayton; Navarro, Luis A.; Golden, Josh H.; Madianos, Leonidas M.; Kemp, Neil T.


Noor H. Jabarullah

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Dr Emanuele Verrelli
Lecturer in Physics, Director of Postgraduate Researchers, Seminar organiser, First aider

Clayton Mauldin

Luis A. Navarro

Josh H. Golden

Leonidas M. Madianos

Neil T. Kemp


Surface interface engineering using superhydrophobic gold electrodes made with 1-dodecanethiol self-assembled monolayer (SAM) has been used to enhance the current limiting properties of novel surge protection devices based on the intrinsic conducting polymer, polyaniline doped with methanesulfonic acid. The resulting devices show significantly enhanced current limiting characteristics, including current saturation, foldback, and negative differential effects. We show how SAM modification changes the morphology of the polymer film directly adjacent to the electrodes, leading to the formation of an interfacial compact thin film that lowers the contact resistance at the Au−polymer interface. We attribute the enhanced current limiting properties of the devices to a combination of lower contact resistance and increased Joule heating within this interface region which during a current surge produces a current blocking resistive barrier due to a thermally induced dedoping effect caused by the rapid diffusion of moisture away from this region. The effect is exacerbated at higher applied voltages as the higher temperature leads to stronger depletion of charge carriers in this region, resulting in a negative differential resistance effect


Jabarullah, N. H., Verrelli, E., Mauldin, C., Navarro, L. A., Golden, J. H., Madianos, L. M., & Kemp, N. T. (2015). Super hydrophobic SAM modified electrodes for enhanced current limiting properties in intrinsic conducting polymer surge protection devices. Langmuir : the ACS journal of surfaces and colloids, 31(22), 6253-6264.

Journal Article Type Article
Acceptance Date May 18, 2015
Online Publication Date May 29, 2015
Publication Date Jun 9, 2015
Deposit Date Jun 23, 2015
Publicly Available Date Jun 23, 2015
Journal Langmuir
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 31
Issue 22
Pages 6253-6264
Keywords Physics
Public URL
Publisher URL
Additional Information This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acs.langmuir.5b00686


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