A novel method for preparing ordered SnO_2/TiO_2 alternate nanoparticulate films

摘要

A novel method using LB films as precursors to prepare pure inorganic ordered films with periodic structure was developed.Surfactant-stabilized SnO_2 nanoparticulate organosols and TiO_2 nanoparticulate organosols were prepared and used as spreading solutions.Using LB technique,the good film-forming ability of the surfactant-stabilized SnO_2 nanoparticles and TiO_2 nanoparticles was confirmed by the determination of the #pi#-A isotherms.The surfactant-stabilized SnO_2 and TiO_2 nanoparticulate monolayers were fabricated on the water surface and then were transferred to solid substrates (CaF_2,quartz,silicon,and so on ) alternately,layer-by-alyer.Then the as-deposited alternate LB films was treated at different temperatures.The as-deposited alternate LB film and the treated film were characterized by Fourier transform infraed spectroscopy,UV-visible spectroscopy,X-raydiffraction,and X-ray photoelectron spectroscopy.There sults indicate that our method was successful.The as-deposited alternate LB filmformed a periodic structure with a long spacing of 6.5 nm that was composed of SnO_2 nanoparticles,TiO_2 nanoparticles,and arachidic acid.The treated film composed of SnO_2 nanoparticles and TiO_2 nanoparticles formed a pure inorganic periodic strucure with an ordered distance of 5.4 nm.