I carry out biosensing using thin film gold electrodes. I measure the impedance magnitude and phase as a funtion of frequency.
Will plotting |Z| vs θ be similar to Z' vs Z" (real impedance vs imaginary impedance).
Dear Anubhav Bussooa ,
yes, they look, at a 1st glance, as 'similar' (to Nyquist plot), with a ... high tolerance.
Also, I use to form a similar (faster) plot 'LOG(|Z|) v/s θ', but only, as a draft plot; however, the (normalization of the) Nyquist plot is more essential towards a better[1] evaluation of the biosensing properties of your WE (thin film gold electrode).
1. You get a better hint to 1) find an ECM (Equiv. Circuit Model) and 2) form a link among few parameters of the ECM with the concentration[2] of the material you want to sense, after fitting the ECM.
2. Fig. 2(A) EIS responses of phage-based cytosensor after incubation with different concentrations of SW620 cells: (a) 0, (b) 2.0 × 102, (c) 2.0 × 103, (d) 2.0 × 104, (e) 2.0 × 105, (f) 2.0 × 106, (g) 2.0 × 107, and (h) 2.0 × 108 cells mL−1, in 'Recent applications of bacteriophage-based electrodes: A mini-review' https://www.sciencedirect.com/science/article/pii/S1388248118303321
If you plotted the graph between log |Z| vs θ with various frequencies, that plot is called it as Bode plot.
Here θ is the intermediate phase angel
Where θ=0 for pure resistor and
θ=90° for the capacitor.
But in the case of Nyquist plot, the graph plotted between real and imaginary part of Z.
Hence these two plots are totally different to express the parameters.
Thanks Diwakar karuppiah!! I have plotted bode plots as well.
I then plotted lgZ on x-axis and θ on y-axis, and was wondering if it was supposed to look similar to nyquist plot, which is in fact Zcosθ vs Zsinθ...
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