A titania nanorod filmwas synthesized by direct oxidation of metallic Ti with hydrogen peroxide solution under a low temperature.Titania nanoparticles were then filled into the gaps among the nanorods through an infil...A titania nanorod filmwas synthesized by direct oxidation of metallic Ti with hydrogen peroxide solution under a low temperature.Titania nanoparticles were then filled into the gaps among the nanorods through an infiltration sol-gel procedure to form a composite titania film with an ordered nanostructure.X-ray diffraction spectra indicate that the composite film was a mixture of anatase and rutile while the titania film obtained by only using a sol-gel procedure was pure anatase.Field emission scanning electron microscopy observations show that titania nanoparticles were embedded into the titania nanorod film.Photoluminescence spectra suggest the enhanced separation of electron and hole pairs for the obtained composite titania film over the corresponding titania nanorod film.The composite titania film exhibited improved ability to photodegrade rhodamine B in water compared with the titania nanorod film.The apparent photodegradation rate constant,fitting a pseudo-first-order,was 3 times of that obtained by the sol-gel derived titania film at the same weight.The improved photocata-lytic activity for the composite titania film could be attributed to the enhanced separation of electron and hole pairs due to the embedding of the titania nanoparticles within the titania nanorods.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant No.50502029).
文摘A titania nanorod filmwas synthesized by direct oxidation of metallic Ti with hydrogen peroxide solution under a low temperature.Titania nanoparticles were then filled into the gaps among the nanorods through an infiltration sol-gel procedure to form a composite titania film with an ordered nanostructure.X-ray diffraction spectra indicate that the composite film was a mixture of anatase and rutile while the titania film obtained by only using a sol-gel procedure was pure anatase.Field emission scanning electron microscopy observations show that titania nanoparticles were embedded into the titania nanorod film.Photoluminescence spectra suggest the enhanced separation of electron and hole pairs for the obtained composite titania film over the corresponding titania nanorod film.The composite titania film exhibited improved ability to photodegrade rhodamine B in water compared with the titania nanorod film.The apparent photodegradation rate constant,fitting a pseudo-first-order,was 3 times of that obtained by the sol-gel derived titania film at the same weight.The improved photocata-lytic activity for the composite titania film could be attributed to the enhanced separation of electron and hole pairs due to the embedding of the titania nanoparticles within the titania nanorods.
