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Title: Fabrication of TiO{sub 2} nanocrystallized glass

Abstract

Nanocrystallization of rutile and anatase was observed in a CaO-B{sub 2}O{sub 3}-Bi{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-TiO{sub 2} crystallized glass. The color of the present crystallized glass was changed by the heat-treatment temperature, and x-ray diffraction (XRD) patterns of the crystallized glass show that the apparent color change is correlated with the formation of titania nanocrystallites. The particle size of crystallites observed in the transmission electron microscope image is comparable to that measured by XRD pattern. In addition, a large change of refractive index between the rutile particles and glass matrix, 0.8 or larger, was obtained. The present titania crystallized glass will be not only a photocatalytic material but also a promising candidate for random lasing devices.

Authors:
; ; ;  [1];  [2]
  1. Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Sendai 980-8579 (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
20971841
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 90; Journal Issue: 8; Other Information: DOI: 10.1063/1.2679044; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; BISMUTH OXIDES; BORON OXIDES; CALCIUM OXIDES; CRYSTALLIZATION; FABRICATION; GLASS; HEAT TREATMENTS; PARTICLE SIZE; PARTICLES; PHOTOCATALYSIS; RANDOMNESS; REFRACTIVE INDEX; RUTILE; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Masai, Hirokazu, Fujiwara, Takumi, Mori, Hiroshi, Komatsu, Takayuki, and Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188. Fabrication of TiO{sub 2} nanocrystallized glass. United States: N. p., 2007. Web. doi:10.1063/1.2679044.
Masai, Hirokazu, Fujiwara, Takumi, Mori, Hiroshi, Komatsu, Takayuki, & Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188. Fabrication of TiO{sub 2} nanocrystallized glass. United States. doi:10.1063/1.2679044.
Masai, Hirokazu, Fujiwara, Takumi, Mori, Hiroshi, Komatsu, Takayuki, and Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188. Mon . "Fabrication of TiO{sub 2} nanocrystallized glass". United States. doi:10.1063/1.2679044.
@article{osti_20971841,
title = {Fabrication of TiO{sub 2} nanocrystallized glass},
author = {Masai, Hirokazu and Fujiwara, Takumi and Mori, Hiroshi and Komatsu, Takayuki and Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188},
abstractNote = {Nanocrystallization of rutile and anatase was observed in a CaO-B{sub 2}O{sub 3}-Bi{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-TiO{sub 2} crystallized glass. The color of the present crystallized glass was changed by the heat-treatment temperature, and x-ray diffraction (XRD) patterns of the crystallized glass show that the apparent color change is correlated with the formation of titania nanocrystallites. The particle size of crystallites observed in the transmission electron microscope image is comparable to that measured by XRD pattern. In addition, a large change of refractive index between the rutile particles and glass matrix, 0.8 or larger, was obtained. The present titania crystallized glass will be not only a photocatalytic material but also a promising candidate for random lasing devices.},
doi = {10.1063/1.2679044},
journal = {Applied Physics Letters},
number = 8,
volume = 90,
place = {United States},
year = {Mon Feb 19 00:00:00 EST 2007},
month = {Mon Feb 19 00:00:00 EST 2007}
}
  • Graphical abstract: - Highlights: • Fe-doped TiO{sub 2} immobilized on glass-fiber net were prepared by sol–gel method. • Fe inhibited the phase transition of TiO{sub 2} from anatase to rutile. • The optimal Fe doping dose was around 0.005 wt%. • The optimal calcination temperature was around 600 °C. - Abstract: Iron-doped anatase titanium dioxide catalysts coated on glass-fiber were successfully synthesized by a dip-coating sol–gel method. The prepared catalysts were characterized by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy to understand the synthesis mechanism, and their photocatalytic activities weremore » evaluated by photodegradation of phenol under simulated solar irradiation. EDX analysis confirmed the existence of iron in the immobilized catalysts. XRD suggested that the phase transition of the catalysts from anatase to rutile were restrained, and almost pure anatase TiO{sub 2} could retain even the calcination temperature reached 800 °C. The UV-Vis diffuse reflectance spectroscopy of the catalysts showed a red shift and increased photoabsorbance in the visible range for all the doped samples. Iron loading and calcination temperature have obvious influences on photocatalytic activity. In this study, the optimal doping dose and calcination temperature were around 0.005 wt% and 600 °C, respectively.« less
  • All available thermodynamic and phase diagram data have been critically assessed for all phases in the MnO-TiO[sub 2], MgO-TiO[sub 2], FeO-TiO[sub 2], Ti[sub 2]O[sub 3]-TiO[sub 2], Na[sub 2]O-TiO[sub 2], and K[sub 2]O-TiO[sub 2] systems at 1 bar pressure from 298 K to above the liquidus temperatures. All reliable thermodynamic and phase diagram data have been simultaneously optimized to obtain, for each system, one set of model equations for the Gibbs energy of the liquid slag as a function of composition and temperature and equations for the Gibbs energies of all compounds as functions of temperature. The modified quasichemical model wasmore » used for the molten slag phases.« less
  • Fast lithium ion conducting glass-ceramics have been successfully prepared from the pseudobinary system 2[Li{sub 1+x}Ti{sub 2}Si{sub x}P{sub 3{minus}x}O{sub 12}]-AlPO{sub 4}. The major phase present in the glass-ceramics was LiTi{sub 2}P{sub 3}O{sub 12} in which Ti{sup 4+} ions and P{sup 5+} ions were partially replaced by Al{sup 3+} ions and Si{sup 4+} ions, respectively. Increasing x resulted in a considerable enhancement in conductivity, and in a wide composition range extremely high conductivity over 10{sup {minus}3} S/cm was obtained at room temperature.
  • Photocatalytic activity of TiO{sub 2} thick film ceramics made of commercial TiO{sub 2} powder has been studied. The TiO{sub 2} powder was nano sized one that was derived from dried TiO{sub 2} suspension. The TiO{sub 2} suspension was made by pouring some blended commercial TiO{sub 2} powder into some amount of water. The paste of TiO{sub 2} was made by mixing the nano sized TiO{sub 2} powder with organic vehicle and glass frit. The paste was spread on a glass substrate. The paste was dried at 100 deg. C and heated at different temperatures (400 deg. C and 500 deg.more » C) for 60 minutes to produce thick film ceramics. The photocatalytic activity of these films was evaluated by measuring the concentration of a solution of methylene blue where the thick films were inside after being illuminated by UV light at various periods of times. The initial concentration of the methylene blue solution was 5 ppm. Structural analyses were carried out by X-ray diffraction (XRD). The XRD analyses showed that the produced thick film ceramic had mainly crystal structure of anatase. According to the photocatalytical data, it was known that the produced thick film ceramics were photocatalyst which were capable of decomposing an organic compound such as the methylene blue.« less
  • Dye-sensitized solar cells (DSSCs) require annealing of TiO{sub 2} photoelectrodes at 450 °C to 550 °C. However, such high-temperature annealing is unfavorable because it limits the use of materials that cannot withstand high temperatures, such as plastic substrates. In our previous paper, a low-temperature annealing technique of TiO{sub 2} photoelectrodes using ultraviolet light and dielectric barrier discharge treatments was proposed to reduce the annealing temperature from 450 °C to 150 °C for a TiO{sub 2} paste containing an organic binder. Here, we measure the electron diffusion length in the TiO{sub 2} film, the amount of dye adsorption on the TiO{sub 2} film, and themore » sheet resistance of a glass substrate of samples manufactured with the 150 °C annealing method, and we discuss the effect that the 150 °C annealing method has on those properties of DSSCs.« less