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. 2020 Oct 1;170:112673. doi: 10.1016/j.bios.2020.112673

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Fig. 4 — Biosensors reported for direct viral antigen or viral particle detection of SARS-CoV-2. (A) A graphene field-effect transistor for electrical probing of SARS-CoV-2 surface antigen (spike protein Si subunit, or its receptor binding domain (RBD)). Reprint from (X. Zhang et al., 2020b). (B) A field-effect transistor-based biosensor for rapid detection of SARS-CoV-2 virus in human nasopharyngeal swab specimens. Reprint from (Seo et al., 2020).