Wilk_Lecture_9-impedance spectroscopy abridged

Wilk_Lecture_9-impedance spectroscopy abridged - 1 ASU...

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Unformatted text preview: 1 ASU Biological Design Fall 2008 Biological Design Program Engineering Lecture 8 Dr. Seth Wilk 2 ASU Biological Design Fall 2008 Impedance Spectroscopy (IS) – Electrochemical tool to characterize electrical properties of a material and its interface – Because impedance is frequency dependent (i.e. the impedance of a capacitor changes with frequency) we can measure a system at different frequencies and model the impedance that would give the measured response 3 ASU Biological Design Fall 2008 Impedance Spectroscopy - Basics – First apply a small excitation signal to the system (usually a voltage) – Measure the response (usually a current) – Calculate the impedance using ohms law – Plot on complex plane and use prior knowledge of system to simulate a model – Fit the measured data and obtain values for different circuit parameters V Z i = 2 2 1 tan ( / ) Z R jX Z Z R X X R θ θ- = + = ∠ = + = ( 29 ( 29 ' sin '' cos Z X Z Z R Z θ θ = = = = 4 ASU Biological Design Fall 2008...
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Wilk_Lecture_9-impedance spectroscopy abridged - 1 ASU...

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