Figure 4

Morphological analysis to study the reusability of the biosensing chip.
(a) 3D surface profile, (a.1) line profile graph for the surface roughness and (a.2) the measured S-parameter of the bare resonator, (b) 3D surface profile, (b.1) line profile graph for the surface roughness and (b.2) the measured resonator S-parameter bearing the serum sample (1.48 mg/mL), (c) 3D surface profile, (c.1) line profile graph for the surface roughness and (c.2) the measured S-parameter of the resonator rinsed off with PBS and dried.