Fig. 4From: How can nanotechnology help to combat COVID-19? Opportunities and urgent need(Reprinted with permission from Seo et al. [118])Schematic diagram of COVID-19 FET sensor operation procedure. Graphene as a sensing material is selected, and SARS-CoV-2 spike antibody is conjugated onto the graphene sheet via 1-pyrenebutyric acid N-hydroxysuccinimide ester, which is an interfacing molecule as a probe linkerBack to article page