Preparation of Nb-doped TiO2 films by the sol-gel method

Tsuzuki, A.; Murakami, Haruhiko; Kani, Keiko; Kawakami, Shusuke; Torii, Yasuyoshi

doi:10.1007/bf00721784

Cited by 12 publications

(7 citation statements)

References 7 publications

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“…Because amorphous TiO 2 fabricated by the sol–gel methods changes to anatase TiO 2 under annealing at 400°C, 8,9 the anatase TiO 2 would be thermodynamically more stable than the amorphous TiO 2 ; consequently, the solubility of the amorphous TiO 2 might be higher than that of the anatase TiO 2 . However, for the much higher supersaturation in the solution during the initial stages of TEOT hydrolysis, the nucleation rate of the metastable phase would be faster than that of the stable one, based on Ostwald's rule of stages 32…”

Section: Resultsmentioning

confidence: 99%

“…The size of anatase TiO 2 crystals included in the solution was about 80 nm and was larger than that of the particles obtained when the titanium oxide precursors were obtained by the conventional sol-gel methods using titanium alkoxide such as titanium isopropoxide. [29][30][31] Because amorphous TiO 2 fabricated by the sol-gel methods changes to anatase TiO 2 under annealing at 4001C, 8,9 the anatase TiO 2 would be thermodynamically more stable than the amorphous TiO 2 ; consequently, the solubility of the amorphous TiO 2 might be higher than that of the anatase TiO 2 . However, for the much higher supersaturation in the solution during the initial stages of TEOT hydrolysis, the nucleation rate of the metastable phase would be faster than that of the stable one, based on Ostwald's rule of stages.…”

Section: August 2006mentioning

confidence: 99%

“…However, the formation of uniform anatase TiO 2 thin films on specially shaped substrates is complicated, because controlling the size of the crystalline particles and the thickness of thin films of anatase TiO 2 is difficult. Moreover, because annealing operations at several hundred degrees celsius are necessary for conventional wet processing, 6–9 a large amount of energy is consumed in the formation of crystals and thin films of anatase TiO 2 and it is impossible to form the anatase TiO 2 thin films on lower thermostability material substrates.…”

Section: Introductionmentioning

confidence: 99%

“…Anatase titanium dioxide (TiO 2 ) is one of the most representative photocatalysts. Crystals and thin films of anatase TiO 2 are produced by dry processes such as sputtering 3,4 and chemical vapor deposition methods, 5 and by wet processes such as dipcoating, 6,7 sol-gel, 8,9 spray coating, 10,11 and spin-coating methods. 12 Wet-processing operations are easy and require no particular equipment.…”

Section: Introductionmentioning

confidence: 99%

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Anatase Titanium Dioxide Crystallization by a Hydrolysis Reaction of Titanium Alkoxide without Annealing

Funakoshi

Nonami

2006

Journal of the American Ceramic Society

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The crystallization of anatase titanium dioxide (TiO2) was achieved by a hydrolysis reaction of titanium alkoxide without annealing. The hydrolysis reaction rates of tetraethyl orthotitanate were indicated by a function of the concentration of acetylacetone added. The degree of crystallinity of the product particles was influenced by the amounts of acetylacetone and seed crystals. Anatase TiO2 was crystallized by restraining the rapid increase in supersaturation of TiO2 and the consequent nucleation of amorphous TiO2. The degree of crystallinity of the product particles also changed with the types of seed crystals used, and was strongly influenced by the specific surface areas of the seed crystals.

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Section: Resultsmentioning

confidence: 99%

Section: August 2006mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anatase Titanium Dioxide Crystallization by a Hydrolysis Reaction of Titanium Alkoxide without Annealing

Funakoshi

Nonami

2006

Journal of the American Ceramic Society

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“…Crystals and thin films of anatase TiO 2 are ordinarily produced by dry processes such as sputtering 3,4 and chemical vapor deposition methods, 5 or by wet processes such as dip-coating, 6,7 sol-gel, 8,9 spray-coating, 10,11 and spin-coating methods. 12 Although the wet-processing operations are relatively easy and require no particular equipment, the formation of uniform anatase TiO 2 photocatalytic thin films on special-shaped substrate surfaces is complicated.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic treatments on dental mirror surfaces using hydrolysis of titanium alkoxide

Funakoshi

Nonami

2007

J Coat Technol Res

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Anatase titanium dioxide (TiO 2 ) photocatalytic thin films were directly formed on glass slide and commercial dental mirror substrate surfaces by a hydrolysis of titanium alkoxide, and the hydrophilicity, the degree of oxidizing power and the transparency of the anatase TiO 2 -coated substrate surfaces. The contact angles of water and the decomposition rates of methylene blue on the anatase TiO 2 photocatalytic thin films improved with the increasing duration of a tetraethyl orthotitanate (TEOT) hydrolysis, but they hardly changed for the longer duration. The reflectance of anatase TiO 2 photocatalytic thin films coated on glass slide substrate surfaces was higher as the duration of a TEOT hydrolysis increased. Similar tendencies concerning hydrophilicity and transparency were recognized in cases of commercial dental mirror substrate surfaces. A hydrolysis of titanium alkoxide obtained superhydrophilic and antibacterial treatments with excellent transparency on commercial dental mirror substrate surfaces.

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Coatings for High Temperature Use

Köstlin¹

2004

Sol-Gel Technologies for Glass Producers and Users

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Oxidation resistant nickel-aluminide coatings are designed to develop a protective alumina scale during high temperature exposure. It is well established that platinum additions, typically about 6-8 at%, provide substantial improvements in oxidation resistance of such coatings, yet the nature of the platinum effect is still not fully understood. In this work, the oxidation behavior of two commercial NiAl and NiPtAl coatings deposited on the same Ni-base single crystal alloy CMSX-4 was analyzed. Cyclic and isothermal oxidation tests were conducted at 1150 o C in air. Microstructure development and alumina/coating interface chemistry were studied as a function of oxidation time. Numerous voids developed at the Al 2 O 3 /NiAl interface, and sulfur was found to segregate at the void surfaces and at the contact interface, leading to spallation of the scale over the convex areas along ridges on the coating surface. The presence of platinum prevented sulfur segregation and void formation at the Al 2 O 3 /NiPtAl interface. As a result, the Al 2 O 3 scale on the NiPtAl coating remained adherent and virtually no spallation was observed even after prolonged cyclic oxidation.

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Preparation of Nb-doped TiO2 films by the sol-gel method

Cited by 12 publications

References 7 publications

Anatase Titanium Dioxide Crystallization by a Hydrolysis Reaction of Titanium Alkoxide without Annealing

Anatase Titanium Dioxide Crystallization by a Hydrolysis Reaction of Titanium Alkoxide without Annealing

Photocatalytic treatments on dental mirror surfaces using hydrolysis of titanium alkoxide

Coatings for High Temperature Use

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