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. 2022 Oct 12;12(10):862. doi: 10.3390/bios12100862

Figure 1.

Figure 1

Schematic diagram of optical sensors in biological detection: (a) colorimetric sensor for the detection of RNA from SARS-CoV-2. Reprinted with permission from ref. [26]. (b) Fluorescent sensor for the identification of SARS-CoV-2 in wastewater. Reprinted with permission from ref. [27]. Copyright 2022, American Chemical Society. (c) SERS sensor for the detection of tumor cell exosomes. Reprinted with permission from ref. [28]. Copyright 2022, Elsevier. (d) Plasma sensor for the detection of SARS-CoV-2. Reprinted with permission from ref. [29]. Copyright 2020, American Chemical Society.