Ultrasensitive Detection of Ferulic Acid Using Poly(diallyldimethylammonium chloride) Functionalized Graphene-Based Electrochemical Sensor

Figure 9

DPVs of FA with different concentrations (a: 0.0895; b: 4.29; c: 5.55; d: 7.92; e: 10.61; f: 11.56; g: 14.09; h: 14.88; i: 17.12; j: 19.94; k: 21.84; l: 52.92  μM) on PDDA-G/GCE in pH 3.0 acetate buffer solution. Conditions: scanned from 0 V to 0.7 V with amplitude of 0.05 V and pulse width of 0.05 s. Inset: the calibration curve between the anodic peak currents with the concentration of FA.