Cyclic voltammograms for 50 moldm-3 catechol were recorded with plain GCE, PEDOT-GO, PEDOT-rGO and PEDOT-rGO incorporated with LAC at pH 7.0 and scan rate 50 mVs-1 Fig. 4.3.4. Fig 4.3.4A present CVs and the anodic peak current observes for dopamine are bare small redox peak was observed. The modification of PEDOT-GO and PEDOT-rGO were increase in increase in the redox reak compared with bare electrode. The incorporation of LAC on the PEDOT-rGO gives decrease in the oxidation and increase in the reduction because of o-dopaquinone is changed as dopamine enzymatic oxidation. The increase in the reduction peak current of enzyme electrode is due to reduction of more o-dopaquinone convert to dopamine by 2e- transfer process. Thus the modification of the electrode resulted in prominent enzyme incorporating which in turn increase the sensitivity of detection of dopamine. PEDOT-rGO-LAC can give good enzymatic electron pathways between electrode and electrolyte and could be good platform for sensing applications. The number of electrons transferred in the modified electrode is calculated from the Laviron’s equation [1]. The n value i.e. the number of electron transferred calculated from the equation [1] is found to be 2.14.…show more content… The result shows between the oxidation and reduction peak with the scan rate in the range of 10-250 mVs-1 (Fig. 4.3.4.1a). The linearity between the square root of the scan rate and the anodic and cathodic peak current reveals diffusion controlled reduction. Moreover, the electroactive area can be estimated by Randles- Sevcik equation [2] for the modified electrode. The diffusion coefficient of enzymatically oxidized dopamine was obtained from slope of the straight line obtained in the plot Ipc versus υ1/2 (Fig. 4.3.4.1b). The electroactive area of the prepared electrode is calculated by equation [2] and it is 0.0396