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. 2022 Jan 4;201:113960. doi: 10.1016/j.bios.2021.113960

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Fig. 2 — (a) Schematic representation for fabrication of the electrochemical biosensor for SARS-CoV-2 RNA detection. Characterization of various modification steps of the biosensing surface by (b) CV and (c) EIS (insert shows Randles equivalent circuit) for (ⅰ) AuNF/NC/SPCE, (ⅱ) SA/AuNF/NC/SPCE, (ⅲ) BSA/SA/AuNF/NC/SPCE, (ⅳ) reRNA/BSA/SA/AuNF/NC/SPCE, and (ⅴ) cleaved reRNA/BSA/SA/AuNF/NC/SPCE. (d) Representation of the change in current obtained by DPV for steps (ⅳ) and (ⅴ).