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(a) Construction of the ACE2-SWCNT nanosensor formation to sense protein ACE2. Reprinted with permission from ref. [52]. Copyright 2021, American Chemical Society. (b) Detection of the RdRp/Hel gene of SARS-CoV-2 via an upconversion nanoparticles/graphene-based biosensor. Reprinted with permission from ref. [53].
