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. 2022 Feb 21;359:131591. doi: 10.1016/j.snb.2022.131591

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Fig. 1 — Schematic illustration of the steps for the fabrication of the SARS-CoV-2 SP immunosensor: partial exfoliation and oxygen functionalization of GCF; EDA functionalization of OGCF; immobilization of anti-SARS-CoV-2; binding of SARS-CoV-2 SP; label-free detection of SARS-CoV-2 SP antigen using [Fe(CN)₆]^3−/4−.