Figure 4.

MoS₂ in biosensors: (a) Schematic illustration of the fabrication process of the HIV biosensor based on an Au/MoS₂/Au multilayer on a polyethylene terephthalate (PET) substrate; the square wave voltammogram for detecting gp120 with its linear response curve (Reprinted with permission from [122], published by MDPI, 2019), (b) Schematic illustration of the let-7b miRNA detection mechanism using a fluorescent biosensor composed of the MoS₂ nanosheet, ssDNA with fluorescein amidite (FAM), and duplex-specific nuclease (DSN); the measured fluorescence signal with different concentrations of the let-7b miRNA and its linear response curve (Reprinted with permission from [125], published by American Chemical Society, 2018), (c) Schematic illustration of the MC–LR detection process using MoS₂ quantum dots (QDs) and aptamer-modified AuNPs; the fluorescence signals of MoS₂ QDs by with different added concentrations of microcystin–LR (MC–LR) with its linear response curve (Reprinted with permission from [130], published by American Chemical Society, 2020).