Enhanced optical,visible light catalytic and electrochemical properties of Au@TiO2 nanocomposites

Au@TiO₂ nanocomposites and pure TiO₂ were successfully used to know the effect of Au on TiO₂ and their comparative optical, visible light catalytic and electrochemical activities were investigated. Optical parameters such as band gap energy (E_g = 2.4 eV), absorption coefficient (α), refractive index (n) and dielectric constants (σ) have been determined using different methods. Visible light (λ = ～590 nm) catalytic activity of Au@TiO₂ nanocomposites was performed for reducing methyl orange (MO) under visible light irradiation. CV, EIS and DPV studies demonstrate that Au@TiO₂ nanocomposites exhibit redox behavior, charged its surface by accumulating electrons, store and release the electrons.