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.

Abstract

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

Citation

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. https://doi.org/10.1021/acs.langmuir.5b00686

• 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
• DOI: https://doi.org/10.1021/acs.langmuir.5b00686
• Keywords: Physics
• Public URL: https://hull-repository.worktribe.com/output/375697
• Publisher URL: http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.5b00686
• 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