Sensitivity Improvement of an Impedimetric Immunosensor Using Functionalized Iron Oxide Nanoparticles

Table 4

Fitting parameters obtained from the proposed equivalent circuit for the different layers of the immunosensor based on iron oxide nanoparticles.

Layer	𝑅𝑠 (Ωcm^2)	𝑅𝑚 (Ωcm^2)	CPE (Fcm^2)	𝛼CPE	𝜒^2
Bare gold	51.63	8292	1.8847E-5	0.96414	0.0011
Thiol	47.18	47280	4.4323E-6	0.95475	0.00023
Iron oxide nanoparticles	43.22	52673	3.0594E-6	0.92432	0.0011
Ab	44.63	74200	4.1848E-6	0.92349	0.0012