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. Author manuscript; available in PMC: 2020 Apr 15.
Published in final edited form as: Biosens Bioelectron. 2019 Jan 29;131:46–52. doi: 10.1016/j.bios.2019.01.040

Figure 1.

Figure 1.

Schematic of capacitive immunosensor design and working principles. (a) Device layers and resulting immunosensor shown from the top. RE: reference electrode, WE: working electrode; (b) Working electrode (Au microwire) surface chemistry and functionalized layers, with the corresponding equivalent circuit and total capacitance equation. DL capacitance, CDL, is placed in parallel with a leakage resistance, Rleak. CDL represents the total capacitance, Ctot, of the individual capacitance contribution from each surface layer.