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(a) State-of-the-art diagram of SERS sensing for interrogating SARS-CoV-2. Reprinted with permission from ref. [88]. Copyright 2021, Elsevier. (b) Schematic diagram of the operation procedure of COVID-19 SERS sensors. Reprinted with permission from ref. [89]. (c) The schematic of the two-step SERS detection based on SnS2 microspheres for diagnosing the infectiousness of SARS-CoV-2. Reprinted with permission from ref. [90]. Copyright 2022, Elsevier.
