One-pot Synthesis of Fe2O3/PEDOT/rGO Nanocomposite for Sensitive Determination of Caffeine

In this research, a ternary nanocomposite, based on iron oxide (Fe 2 O 3 ), reduced graphene oxide (rGO) and PEDOT had been successfully synthesized via one-pot method for the electrochemical detection of caffeine. The obtained nanocomposite Fe 2 O 3 /PEDOT/rGO was characterized by SEM, EDS, XRD, XPS and Raman spectroscopy to confirm the morphology, structure and composition. In addition, the electrochemical behaviors of caffeine on the nanocomposite modified electrode were investigated by cyclic voltammetry and differential pulse voltammetry. The results demonstrated that the Fe 2 O 3 /PEDOT/rGO nanocomposite exhibited excellent electrocatalytic activity to caffeine. Under the optimized conditions, the Fe 2 O 3 /PEDOT/rGO modified glassy carbon electrode showed a wide linear range of 1.0 × 10 -6 to 8.0 × 10 -4 M with the correlation coefficient of 0.992 and a detection limit of 3.3 × 10 -7 M for the determiantion of caffeine. Furthermore, the modified electrode displayed high sensitivity and selectivity, good reproducibility and long-term stability in subsequent experiments. It was also successfully used to determine caffeine in beverage samples.