《(WO3)x–(TiO2)1#8722;x nano-structured porous catalysts arc》.pdf

Materials Chemistry and Physics 124 (2010) 203–207 Contents lists available at ScienceDirect Materials Chemistry and Physics j o u rn al h omepage: w w w. elsev /locate/matc hemphys (WO ) –(TiO ) nano-structured porous catalysts grown by micro-arc 3 x 2 1−x oxidation method: Characterization and formation mechanism M.R. Bayati a,b,∗ , A.Z. Moshfegh c,d , F. Golestani-Fard a,b , R. Molaei a,b a School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box: 16845-161, Tehran, Iran b Center of Excellence for Advanced Materials, Iran University of Science and Technology, P.O. Box: 16845-195, Tehran, Iran c Department of Physics, Sharif University of Technology, P.O. Box: 11155-9161, Tehran, Iran d Institute for Nanoscience and Nanotechnology, Sharif University of Technology, P.O. Box: 14588-89694, Tehran, Iran a r t i c l e i n f o a b s t r a c t Article history: Very recently, we fabricated (WO ) –(TiO ) layers via micro-arc oxidation process under different 3 x 2 1−x Received 19 January 2010 applied voltages. Morphological and topographical studies, accomplished by SEM and AFM techniques, Received in revised form 6 May 2010 revealed that the pores size as well as the surface roughness increased with the voltage. Phase structure Accepted 4 June 2010 and chemical composition of the layers were also investigated by XRD and XPS and the results showed the grown laye