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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/17592

Title: Anisotropic Proton Conductivity of Poly(aspartic acid) Thin Films
Authors: Nagao, Yuki
Matsui, Jun
Keywords: Centrifugal force
In-plane conductivity
Oriented thin film
Synthetic polypeptide
Through-plane conductivity
Issue Date: 2019-08-08
Publisher: Elsevier
Magazine name: Materials Today: Proceedings
Volume: 17
Number: 3
Start page: 953
End page: 958
DOI: 10.1016/j.matpr.2019.06.448
Abstract: Anisotropic proton conductivity was investigated in 60-nm-thick spin-coated thin films of partially protonated poly(aspartic acid)/sodium polyaspartate (P-Asp). The film showed large conductivity difference between in-plane and through-plane directions. The in-plane and through-plane conductivities to the substrate are 2.7 × 10−6 and 3.4 × 10−9 S cm−1, respectively, at the same relative humidity (RH) of 50% and 298 K. The proton conductivity for the in-plane direction was three orders of magnitude greater than that for the through-plane direction. The anisotropic origin is derived from the reported highly oriented structure of the P-Asp thin film. The proton conductivity exhibits no difference for the two in-plane directions between radial and circumferential directions, which can be expected as anisotropic main chain orientation by a centrifugal force during spin-coating.
Rights: Copyright (C)2019, Elsevier. NOTICE: This is the author's version of a work accepted for publication by Elsevier. Y. Nagaoa, J. Matsui, Materials Today: Proceedings, 17(3), 2019, 953-958, https://doi.org/10.1016/j.matpr.2019.06.448
URI: http://hdl.handle.net/10119/17592
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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