Characterization and dopamine sensing property of V2O5@polyailine nanohybrid

• V2O5@PANI nanohybrid was synthesized by oxidative polymerization method.
• V2O5@PANI exhibits enhanced dopamine sensing property.
• Enhanced activity is due to the synergetic effect of V2O5 and PANI and plausible mechanism has been proposed.
• The proposed sensor showed good sensitivity, stability and repeatability.

In the present study, V2O5@polyaniline (V2O5@PANI) nanohybrid was prepared by oxidative polymerization approach in presence of colloidal V2O5. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Visible spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) reveal that there is an interaction happened between V2O5 and PANI. Plausible explanation for the formation of V2O5@PANI nanohybrid has been explained. The electrochemical oxidation of DA was examined by cyclic voltammetry (CV) and chronoamperometry (CA). The V2O5@PANI modified GC electrode (V2O5@PANI/GCE) showed electrocatalytic oxidation of DA in the linear range from 6.6 × 10−6 M to 1.1 × 10−4 M with the detection limit of 3.9 × 10−5 M. The proposed sensor method showed good sensitivity, stability and repeatability.

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