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Electrochemical Impedance Spectroscopy for Investigation on Ion Permeation in Thioctic Acid Self-Assembled Monolayer

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Document pages: 6 pages

Abstract: Electrochemicalimpedance spectroscopy was employed to investigate the permeation ofelectrolyte ions in thioctic acid self-assembled monolayer when its structurewas changed by the interaction of copper ions. The ion permeation wasevaluated by using relatively low excitation frequencies, 0.2 Hz to 1000 Hz,and quantified by an extra resistive component in the equivalent circuit (RSAM). The extent of ion permeation affected by the electrode potentialsand the electrolyte concentration were investigated. The experimental resultsverified that RSAM decreased ~70 by interaction with copper ions and that RSAM increased ~2 - 3 times when the electrolyte concentration was decreased by 10 times.This analysis can be performed without addition of redox species.

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