Sensitivity Improvement of an Impedimetric Immunosensor Using Functionalized Iron Oxide Nanoparticles

Table 2

Optical parameters obtained by fitting the SPR curves for system 2 based on iron oxide nanoparticles.

Layer	Thickness (nm)	𝑛	kapa	𝜀^′	𝜀^′′
Bare gold	50.72	0.17	3.89	−15.87	1.355
Thiol	2.16	1.34	0	1.791	0
GA	0.1	1.45	0	2.10	0
Iron oxide nanoparticles	301	0.28	2.98	−8.802	1.6688
Ab	1.2	1.45	0	2.10	0