TAILIEUCHUNG - Báo cáo "Preparation and characterization of nanocomposite TiO2/SnO2 films "

This work presents the preparation of nanocomposite TiO2/SnO2 films by using spray pyrolysis and followed by sol-gel technique from TiCl4 and SnCl4 solutions. Obtained films were characterized by XRD, SEM and photoconductivity measurement. It was found that in this method the nanocomposite TiO2/SnO2 films were constituted of nanosized TiO2 and SnO2 surrounded the TiO2 grains. The obtained nanocomposite TiO2/SnO2 materials were shown to have the photoconducting properties. | VNU Journal of Science Mathematics - Physics 24 2008 42-46 Preparation and characterization of nanocomposite TiO2 SnO2 films Pham Van Nho1 Tran Kim Cuong2 1Applied Physics Lab Department of Physics College of Science VNU 334 Nguyen Trai Hanoi Vietnam 2Faculty of Physics University of Dalat 1 Phu Dong Thien Vuong Dalat City Received 28 February 2008 received in revised form 19 March 2008 Abstract This work presents the preparation of nanocomposite TiO2 SnO2 films by using spray pyrolysis and followed by sol-gel technique from TiCl4 and SnCl4 solutions. Obtained films were characterized by XRD SEM and photoconductivity measurement. It was found that in this method the nanocomposite TiO2 SnO2 films were constituted of nanosized TiO2 and SnO2 surrounded the TiO2 grains. The obtained nanocomposite TiO2 SnO2 materials were shown to have the photoconducting properties. A reason of these novel properties was discussed and practical applications of nanocomposite TiO2 SnO2 films were showed. 1. Introduction TiO2 is one of the most attracted materials in nanoscience and nanotechnology because of having a lot of interesting properties from fundamental and practical point of view 1 2 3 . Although many striking results have been achieved when using nano TiO2 in the photo catalytic degradation of contaminated compounds or in the photo electrochemical solar-cell fabrication efforts of scientists to improve performances of this material continuously increase day by day. In order to heighten efficiency nano TiO2 is usually used in the form of as either dye sensitized or nitrogen metal doped materials. Recently a variety of mixed oxide semiconductors have been extensively studied as a new way to enhance performances of nano TiO2 4 . These materials could have a higher performance even new properties. There was attempt to prepare the mixed oxide of TiO2 and SnO2 via a layer-bylayer technique or by co-spray pyrolysis 5 6 . This work presents the results from preparation of TiO2 based .

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