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Processing and Characterization of Porous TiO 2 Coatings
Author(s) -
Kim YoungJoo,
Francis Lorraine Falter
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03668.x
Subject(s) - materials science , anatase , amorphous solid , rutile , chemical engineering , microstructure , particle (ecology) , particle size , precipitation , deposition (geology) , mineralogy , composite material , crystallography , chemistry , organic chemistry , catalysis , engineering , paleontology , oceanography , physics , photocatalysis , sediment , meteorology , biology , geology
Titania coatings were prepared by spin coating anhydrous titanium ethoxide solutions onto Si substrates. During deposition, Ti ethoxide in the solution layer reacted with atmospheric moisture to form precipitated particles. The resulting microstructures were composed of a network of particles and particle clusters. The induction time for precipitation, the particle diameter, and the size and packing of particle clusters were influenced by the Ti concentration in the sol and the spinning rate used for deposition. Individual particle sizes ranged from ∼150 to 250 nm. Smaller particles and more compact particle clusters were characteristic of coatings prepared from solutions with lower Ti concentrations and those prepared using faster spinning rates. Asdeposited coatings were amorphous and crystallized into the anatase phase at ∼400°C. Transformation to the rutile phase began at ∼850°C, and the transformation rate was influenced by the microstructure.