Abstract
ABSTRACTSputtering of TiO2 and pulse laser deposition (PLD) of Pt were performed simultaneously to build the nanocomposite with homogenous dispersion of Pt in TiO2 matrix. The films exhibited a pronounced decrease in the optical band gap energy with increasing Pt content indicating the formation of new energy states in the optical gap of TiO2 matrix. As-deposited nanocomposite films were amorphous and crystallized to Pt metal and rutile type of TiO2 after post-annealing at 600 °C. Pt nanoparticle size in the annealed nanocomposite films increased from 6 to 9 nm with the repetition rate of the laser. The photoelectrochemical measurements of the Pt/TiO2 nanocomposite films in aqueous 0.1 M Na2SO4 solution indicate that a dramatic increase in anodic photocurrent at 1.0 V vs. Ag/AgCl at the wavelength region of visible light occurred in annealed films. Pt nanoparticles in the matrix of TiO2 can play an important role in the optical and photoelectrochemical proprieties of Pt/TiO2 nanocomposite thin films.
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