Authors: A. García-Murillo, E. Ramírez-Meneses, J. Ramírez-Salgado, B.G. Sandoval-Robles, V. Montiel-Palma, H. Dorantes-Rosales, P. Del Angel-Vicente
Affilation: Cicata - IPN Unidad Altamira, Mexico
Pages: 748 - 751
Keywords: sol-gel, thin films, nickel, nanoparticles, organometallic
Titania thin films were synthesized by sol-gel dip-coating method with metallic Ni nanoparticles from an organometallic precursor. Titania matrix and Ni nanoparticles were prepared separately. Titania precursor solution was prepared mixing titanium isopropoxide in isopropanol and stabilized in presence of acetic acid. Nickel nanostructures were synthesized from an organometallic precursor, Ni(COD)2 (COD=cycloocta-1,5-diene) decomposed under H2 atmosphere (3 bars) in an organic solvent in presence of 1,3-diaminopropane as stabilizer. Transmission Electron Microscopy (TEM) studies of Ni nanoparticles before mixing with TiO2 solution, revealed the formation of nickel nanostructures with an average size of 10 nm. XRD analysis of the TiO2 films revealed the crystallization of the anatase phase. Colloidal solution of Ni nanoparticles was added to TiO2 precursor solution obtaining a colloidal stable and gray colorless solution. Ni/TiO2 sol system was used to coated glass substrates and further heat treatment at 400 °C to promote the crystallization of titania. The photocatalytic activity of the Ni/TiO2 films was evaluated in hydrogen evolution from decomposition of ethanol using a mercury lamp for UV light irradiation. Titania films in presence of Ni nanoparticles show higher efficiency in their photocatalytic properties in comparison with titania. The prepared Ni/TiO2 was characterized using AFM, UV-Vis, TEM and HR-TEM.