Preparation of anatase, rutile and brookite type anion doped titania photocatalyst nanoparticles and thin films

Yin, Shu; Ihara, Ken; Liu, Bin; Wang, Yuhua; Li, Ruixing; Sato, Tsugio

doi:10.1088/0031-8949/2007/t129/060

Cited by 15 publications

(12 citation statements)

References 15 publications

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“…The additional Raman modes at about 243, 294, 323 and 362 cm −1 (shown in Fig. 4a), can be ascribed to the brookite phase of titania [17][18][19]. Low intensities and large widths of these modes indicate great disorder and partial amorphization of brookite in all the samples.…”

Section: Resultsmentioning

confidence: 91%

Characterization of La-Doped TiO₂Nanopowders by Raman Spectroscopy

Šćepanović¹,

Aškrabić²,

Berec³

et al. 2009

Acta Phys. Pol. A

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Titanium dioxide (TiO 2 ) nanopowders doped with 0.65, 1, 2, 3 and 4 wt.% of lanthanum ions (La 3+ ) were synthesized by sol-gel technology. Dependence of structural and morphological characteristics of nanopowders on La 3+ content and synthesis conditions is investigated by the Raman spectroscopy. Very intensive modes observed in the Raman spectra of all nanopowder samples are assigned to anatase phase of TiO 2 . Additional Raman modes of extremely low intensity can be related to the presence of certain amount of highly disordered brookite phase in nanopowders. Dependence of the intensity ratio of the Raman modes which originate from anatase and brookite on doping conditions is specially analyzed. In order to estimate the variation of nanocrystallite size with dopant content, shift and asymmetrical broadening of the most intensive E g Raman mode of anatase are analyzed by phonon confinement model. The obtained results are compared with the results of X-ray diffraction spectroscopy. Special attention is dedicated to the changes in the Raman spectra of pure and La-doped TiO 2 nanopowders observed after high temperature treatment.

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Section: Resultsmentioning

confidence: 91%

Characterization of La-Doped TiO₂Nanopowders by Raman Spectroscopy

Šćepanović¹,

Aškrabić²,

Berec³

et al. 2009

Acta Phys. Pol. A

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“…As shown in Figure 10, the anatase and rutile films were less hydrophilic than the brookite film that exhibited a contact angle of 10° in the dark. In addition, N-doped brookite films showed a photoinduced hydrophilic ability highest than that of N-doped anatase and rutile films [122].…”

Section: Pure Brookitementioning

confidence: 88%

“…Yin et al [122,[136][137][138] prepared N-doped brookite nanoparticles by a solvothermal treatment at 190 °C of aqueous or alcoholic solutions of TiCl 3 and hexamethylenetetramine. The samples showed higher photocatalytic activity than that of P25 for the oxidative destruction of nitrogen monoxide under irradiation with visible light (λ > 510 nm) and UV-light (λ > 290 nm).…”

Section: Doped and Loaded Brookitementioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

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Abstract:Brookite is the least studied TiO 2 photocatalyst due to the difficulties usually encountered in order to obtain it as a pure phase. In this review, a comprehensive survey of the different methods available for preparing brookite powders and films is reported. Attention has been paid both to the most traditional methods, such as hydrothermal processes at high temperatures and pressures, and to environmentally benign syntheses using water soluble compounds and water as the solvent. Papers reporting the photocatalytic activity of pure and brookite-based samples have been reviewed.

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“…The anatase polymorph is prevalently used as photocatalyst, rutile in optical devices whilst the physicochemical properties of brookite are not much known because pure brookite without rutile or anatase is rather difficult to be prepared. Recently, a few papers have concerned the photocatalytic behaviour of pure brookite TiO 2 powders [27][28][29][30][31] or films [32,33] and, to the best of our knowledge, only one study on the photoactivity of doped brookite samples has been published [34].…”

Section: Introductionmentioning

confidence: 99%