An innovative approach to electro-oxidation of dopamine on titanium dioxide nanotubes electrode modified by gold particles

作者：Hosseini Mirghasem^*; Momeni Mohamad Mohsen; Faraji Masoud

来源：Journal of Applied Electrochemistry, 2010, 40(7): 1421-1427.

DOI：10.1007/s10800-010-0119-5

• Au/TiO(2)/Ti electrode
• Cyclic voltammetry
• Electro-catalytic
• Dopamine

Au/TiO(2)/Ti electrodes were prepared by galvanic deposition of gold particles from an acidic bath containing KAu(CN)(2) in the presence of a citrate buffer onto TiO(2) nanotubes layer on titanium substrates. Titanium oxide nanotubes were fabricated by anodizing titanium foil in a DMSO fluoride-containing electrolyte. The morphology and surface characteristics of Au/TiO(2)/Ti electrodes were investigated using scanning electron microscopy and energy-dispersive X-ray, respectively. The results indicated that gold particles were homogeneously deposited on the surface of TiO(2) nanotubes. The nanotubular TiO(2) layers consist of individual tubes of about 40-80 nm diameters. The electro-catalytic behavior of Au/TiO(2)/Ti electrodes for the dopamine electro-oxidation was studied by cyclic voltammetry and differential pulse voltammetry. The results showed that Au/TiO(2)/Ti electrodes exhibit a considerably higher electro-catalytic activity toward the oxidation of dopamine. The catalytic oxidation peak current showed a linear dependence on dopamine concentration and a linear calibration curve was obtained in the concentration range of 0.5-2.5 mM of dopamine.

• 出版日期2010-7