Figure 4: (A) Nyquist plots of gold disk electrode with (a) untuned, (b) 20 nm AuNP tuned, (c) 10 nm AuNP tuned, and (d) 5 nm Au NP tuned anti-IL-12 with increasing response (shifted or tuned) by the additional AuNP with a dependency upon size of AuNP. (B) Extrapolated electron transfer resistance (Ret) from the tuned AuNP plotted versus size.