The effect of ambient humidity on the electrical response of ion-migration-based polymer sensor with various cations
The effect of ambient humidity on the electrical response of ion-migration-based polymer sensor with various cations
复制标题
DOI：
10.1088/0964-1726/25/5/055024
复制
发表时间：
2016-04
影响因子：
4.1
通讯作者：
Zicai Zhu;T. Horiuchi;Karl Kruusamäe;Longfei Chang;K. Asaka
中科院分区：
文献类型：
--
作者：
Zicai Zhu;T. Horiuchi;Karl Kruusamäe;Longfei Chang;K. Asaka
离子迁移诱导的水基离子聚合物-金属复合物（IPMC）传感器是一种很有前途的天然传感系统的替代品。针对水效应，研究了Au-Nafion IPMC在多个固定湿度水平下小台阶弯曲变形时的电压响应。电压包括两个过程：快速上升和随后的缓慢衰减。随着环境相对湿度的降低，IPMC的峰值电压先增大后减小，这是因为IPMC的质量存储容量（与聚合物网络的压缩状态相关）在中等含水量（30 ~ 90%RH）时达到最佳，而与水合效应相关的衰减比例随着相对湿度的降低而减小。基于输运理论定性地揭示了详细的物理过程，并提出了一个拟合方程来近似一般的电响应。
A water-based ionic polymer–metal composite (IPMC) sensor, induced by ion migration, is a promising alternative to natural sensing systems. Focusing on water effects, this paper investigated the voltage responses of Au-Nafion IPMC at multiple fixed levels of ambient humidity under a small step bending deformation. The voltage includes two processes: a fast rising and a subsequent slow decay. As the relative ambient humidity decreases, the peak voltage first increases and then decreases because the mass storage capacity of IPMC, related to the compressed state of a polymer network, reaches the optimum at a moderate water content (30 ∼ 90%RH), whereas the proportion of decay related to hydration effect decreases as the level of relative humidity is decreased. The detailed physics has been revealed qualitatively based on transport theory, and a fitting equation has been proposed to approximate the general electrical response.