Formation of flow coated high catalytic activity thin films from the low temperature sol-gel titanium butoxide precursor
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The low temperature sol-gel approach is used in which the titanium butoxide (IV) precursor is hydrolyzed in the presence ofacetic and nitric acids to form a bidentate acetate complex (1538, 1429 cm−1 IR doublet). It is known that the role of the aceticacid as a chemical modifier controls the condensation and oligomerization reactions, but other effect of the complex acetateligand comprises the preferential crystallization of the titania into the anatase phase. In addition, it is found here, that thepresence of such a ligand at acidic pH values considerably impacts the nanostructure i.e. the formation of smooth hydrophobicanatase films containing fine non-aggregated nano-crystallites with auto-assembled micro pores. The resulting anatase-acetatenano-crystalline material is used to form thin films by the flow coating process. 4.2 nm size crystalline anatase and fullydispersed nanoparticles form a pattern of ultra-small crystallites as shown by TEM that are presumably responsible for theremarkable smooth and macro porous thin films with applications in photo-catalysis.
Abstract
The low temperature sol-gel approach is used in which the titanium butoxide (IV) precursor is hydrolyzed in the presence ofacetic and nitric acids to form a bidentate acetate complex (1538, 1429 cm−1 IR doublet). It is known that the role of the aceticacid as a chemical modifier controls the condensation and oligomerization reactions, but other effect of the complex acetateligand comprises the preferential crystallization of the titania into the anatase phase. In addition, it is found here, that thepresence of such a ligand at acidic pH values considerably impacts the nanostructure i.e. the formation of smooth hydrophobicanatase films containing fine non-aggregated nano-crystallites with auto-assembled micro pores. The resulting anatase-acetatenano-crystalline material is used to form thin films by the flow coating process. 4.2 nm size crystalline anatase and fullydispersed nanoparticles form a pattern of ultra-small crystallites as shown by TEM that are presumably responsible for theremarkable smooth and macro porous thin films with applications in photo-catalysis.
참고문헌 (25)
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