一种新型的平面叉指电极传感器的设计与实现

摘要

With increasingly stringent environmental standards,inorganic salts,especially nitrate as an important symbol of water pollution,have been highly focused by researchers. This paper proposed a new type of planar interdig⁃itated electrode sensor for inorganic ions detection and centered around mechanism of it in electrolyte solution with AC impedance technique and electrode kinetics analysis. An equivalent circuit model for double layer effect and elec⁃trode process were proposed and applied to characterize the responses of impedance and phase over the different fre⁃quency ranges. Meanwhile,experimental results show that planar interdigitated electrode sensor have the ability to distinguish the different concentrations of inorganic salt solution,and the distinct identification of nitrate and phos⁃phate based on the features of impedance spectroscopy and phase spectroscopy was also presented in this work.%随着我国水质标准的日趋严格，无机盐类尤其是硝酸盐作为水体污染的重要标志，越来越被研究学者关注。本文提出了一种用于无机物离子检测的新型单片式平面叉指电极传感器，基于交流阻抗技术和电极动力学分析了电极/溶液体系，量化了电极与溶液界面上的双电层效应和传质过程，并建立等效电路模型，深入探讨了在不同频率段下电极/溶液体系的阻抗特性和相位特性。根据不同浓度的无机盐溶液和不同种类的无机盐溶液的实验结果表明，平面叉指电极传感器具有较好的鉴别能力。