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Effect of the Amount of H 2 O on the Crystallization of TiO 2 Films Prepared from Alkoxide Solutions Containing Acetylacetone
Author(s) -
Uchiyama Hiroaki,
Okada Momoto,
Kozuka Hiromitsu
Publication year - 2014
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/jace.12860
Subject(s) - crystallite , crystallization , anatase , grain size , acetylacetone , alkoxide , rutile , dip coating , materials science , sol gel , phase (matter) , refractive index , mineralogy , analytical chemistry (journal) , chemical engineering , crystallography , coating , chemistry , inorganic chemistry , nanotechnology , photocatalysis , organic chemistry , metallurgy , catalysis , optoelectronics , engineering
Sol–gel‐derived TiO 2 films were prepared by dip‐coating from Ti ( OC 3 H 7 i ) 4 – CH 3 COCH 2 COCH 3 – HNO 3 – H 2 O – C 2 H 5 OH solutions, and the effect of the H 2 O content in solutions on the crystallization of TiO 2 films during the heat treatment at 800°C was discussed. The crystalline phase, crystallite size, grain size, and refractive index of the TiO 2 films depended on the H 2 O / Ti ( OC 3 H 7 i ) 4 mole ratios ( x ) in the coating solutions. Highly dense and crystalline rutile films were obtained at x = 0.5–10, where the crystallites and grains became larger with increasing x . The further increase in x from 10 to 50 reduced the crystallite size and refractive index of the films, where anatase phase appeared at x = 30–50.