Figure 4

(a) Electrochemical ability of different concentrations of MoS₂ nanosheets deposited on SPGEs from a concentration of 0.5 to 2 mg/mL in 0.1 M PBS containing 1 µM MB at the scan rate of 100 mVs⁻¹ in the potential range from −0.6 to +0.4 V. (b) Cyclic voltammograms of PDNA/MoS₂NSs/SPGEs in 0.1 M PBS containing 1 µM MB at various concentrations of probe DNA ranging from 5 µM to 100 µM at the scan rate of 100 mVs⁻¹ in the potential range from −0.6 to +0.4 V. (c) Cyclic voltammograms at various stages of screen printed gold electrode (SPGE) including bare SPGE, MoS₂ coated SPGE, probe DNA coated SPGE and target DNA coated SPGE in 0.1 M phosphate buffer saline (pH 7.8), 1 µM MB in the potential range from −0.6 to +0.4 V. (d) Nyquist plot at various stages of screen printed gold electrode (SPGE) including bare SPGE, MoS₂ coated SPGE, probe DNA coated SPGE and target DNA coated SPGE in 0.1 M phosphate buffer saline (pH 7.8) and 1 µM MB (frequency range of 100 Hz–10³ kHz).