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. 2020 Oct 17;172:112724. doi: 10.1016/j.bios.2020.112724

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Fig. 3 — pH detection of suspended MoS₂FET: (a) Schematic of protonation and deprotonation on HfO₂ substrate. (b) I_D-V_LG curve of different pH concentration on the suspended MoS₂ (subset: Linear graph of I_D-V_LG). (c) Sensitivity of pH in subthreshold, saturation, and linear regions from pH 5 to pH 7. (d) experimental threshold voltage of suspended MoS₂ FET from pH 3 to pH 9 (Left-axis); experimental current corresponds to threshold voltage (Right-axis).