Improved Performance for the Electrochemical Sensing of Acyclovir by Using the rGO-TiO2-Au Nanocomposite-Modified Electrode

An electrochemical sensor for sensitive sensing of acyclovir (ACV) was designed by using the reduced graphene oxide-TiO2-Au nanocomposite-modified glassy carbon electrode (rGO-TiO2-Au/GCE). Transmission electron microscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy were used to confirm morphology, structure, and composition properties of the rGO-TiO2-Au nanocomposites. Cyclic voltammetry and linear sweep voltammetry were used to demonstrate the analytical performance of the rGO-TiO2-Au/GCE for ACV. As a result, rGO-TiO2-Au/GCE exerted the best response for the oxidation of ACV under the pH of 6.0 PB solution, accumulation time of 80 s at open-circuit, and modifier amount of 7 mu l. The oxidation peak currents of ACV increased linearly with its concentration in the range of 1-100 mu M, and the detection limit was calculated to be 0.3 mu M (S/N = 3). The determination of ACV concentrations in tablet samples also demonstrated satisfactory results.