Synthesis of Polydopamine Functionalized Reduced Graphene Oxide-Palladium Nanocomposite for Laccase Based Biosensor

Figure 5

(a) Cyclic voltammograms of bare GCE, PDA/GCE, (3) PDA-Lac/GCE, (4) PDA-Lac-rGO/GCE, and (5) PDA-Lac-rGO-Pd/GCE in 0.1 M acetate buffer solution (pH 5.0) containing 220 µM catechol at 100 mV s⁻¹. (b) Cyclic voltammograms of PDA-Lac-rGO-Pd/GCE in 0.1 M acetate buffer solution (pH 5.0) containing 220 µM catechol at scan rates of 40, 80, 120, 160, 200, 240, 280, and 320 mV s⁻¹ (from inner to outer), respectively. Inset: plots of the corresponding anodic and cathodic peak currents versus scan rate.

(a)

(b)