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. 2022 Feb 25;12(3):142. doi: 10.3390/bios12030142

Figure 3.

Figure 3

(A) EIS and (B) CVs and of the CSPE (a) the CSPE/CNFs–AuNPs (b), the CSPE/CNF–AuNP/Aptamer (c), and the CSPE/CNF–AuNP/Aptamer/SARS-CoV-2-RBD (d) at 0.1 M 5.0 mM Fe(CN)63−/4− solution (0.1 M PBS, pH 7.4). The equivalent electric circuit is compatible with the Nyquist diagrams. Rs: Solution resistance; Rct: charge transfer resistance; Cdl: Double layer capacitance; Zw: Warburg impedance. The AC amplitude voltage was 10 mV, DC voltage was 0.13 V, and frequency range was 100 kHz−0.1 Hz. The solid black lines indicate fitting curves. CVs were recorded at the scan rate of 0.05 V·s−1.