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Graphically representation of FET sensor for COVID-19: Firstly, a carbon-based biosensing platform was constructed by functionalising the graphene with viral spike antibody. The functionalisation was done via immobilisation technique, where a coupling agent 1-pyrenebutyric acid N-hydroxysuccinimide ester (PBASE) taking the role of a probe linker. This forms the conjugated graphene sheet capable of detecting 1 fg/mL of viral antigen [152]. Reproduced with permission
