Anisotropic proton conductivity of poly(aspartic acid) thin films
Anisotropic proton conductivity of poly(aspartic acid) thin films
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聚天冬氨酸薄膜的各向异性质子电导率
DOI：
10.1016/j.matpr.2019.06.448
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
J. Matsui
中科院分区：
文献类型：
--
作者：
Y. Nagao;J. Matsui
研究了60 nm厚的部分质子化聚天冬氨酸/聚天冬氨酸钠（P-Asp）旋涂薄膜的各向异性质子导电性。薄膜在面内和面间方向上表现出较大的电导率差异。在相同的相对湿度（RH）为50%和298 K时，衬底的面内和面间电导率分别为2.7 × 10− 6和3.4 × 10− 9 S cm−1。面内方向的质子传导率比穿过面方向的质子传导率大三个数量级。的各向异性起源是来自报告的高度取向的结构的P-Asp薄膜。质子传导率对于径向和周向之间的两个面内方向没有表现出差异，这可以被预期为在旋涂期间通过离心力的各向异性主链取向。
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 × 10−6and 3.4 × 10−9S 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.