Electrochemical Impedance Biosensor (2D): Nyquist & Bode Lab

Electrochemical impedance spectroscopy (EIS) is the label-free workhorse behind many point-of-care biosensors: as antigen molecules bind an antibody-coated electrode, the growing insulating layer raises the charge-transfer resistance, and that shows up directly on a Nyquist plot. This 2D lab computes a full Randles circuit with an added Warburg diffusion element from first principles every frame — real complex-impedance arithmetic, not a 3D re-skin — so you can see both the classic semicircle and the low-frequency 45° diffusion line that appears when probe transport becomes rate-limiting, plus a Bode magnitude/phase view of the same data. Binding still follows real Langmuir kinetics, with concentration, baseline resistance, double-layer capacitance, binding rate and diffusion strength all under your control.