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. 2021 Oct 26;196:113729. doi: 10.1016/j.bios.2021.113729

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Fig. 3 — (A) CV and (B) EIS measurements of the MP-Au-SPE (a), the MIP/MP-Au-SPE before removal of SARS-CoV-2-RBD (b), the MIP/MP-Au-SPE after removal of the SARS-CoV-2-RBD (c), the MIP/MP-Au-SPE after the occupation the cavities with 10.0 pg mL^-1 SARS-CoV-2-RBD (d). CV measurements were done at a scan rate of 0.05 V s⁻¹ in a 0.5 mM Fe(CN)₆^3−/4− solution. EIS measurements were done by applying an alternating current (AC) potential of 10 mV, and a direct current (DC) potential of 0.15 V in the frequency range of 100 kHz-0.1 Hz in a 0.5 mM Fe(CN)₆^3−/4− solution.