Brookite-rich titania films made by pulsed laser deposition

Moret, Mona P.; Zallen, Richard; Vijay, Dilip P.; Desu, Seshu B.

doi:10.1016/s0040-6090(00)00862-2

Cited by 138 publications

(92 citation statements)

References 16 publications

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“…Our results are in line with earlier data of Moret et al [32] on the PLD of brookite-rich TiO 2 . The results of our work also demonstrate that small amounts of chromium oxide (up to 2.5 mass % in the starting material) that were used to modify the sensor properties of the film [36] seem to have no effect on the phase composition.…”

Section: Resultssupporting

confidence: 94%

“…Anatase [9, 13-15, 17, 19-21, 23-28] and rutile [19][20][21][24][25][26][27] are the crystalline phases that are usually formed at normal and low pressures. In addition, brookite has been observed in TiO 2 single crystals [31], powders [31], and thin films [32] at normal conditions. Finally, the orthorhombic TiO 2 -II and monoclinic, baddeleyitetype modifications of TiO 2 can be obtained at high pressures while the TiO 2 -II phase, once formed, can be quenched at normal pressure [33].…”

Section: Introductionmentioning

confidence: 99%

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Structural study of TiO2 thin films by micro-Raman spectroscopy

et al. 2006

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Abstract:The Raman spectroscopy method was used for structural characterization of TiO 2 thin films prepared by atomic layer deposition (ALD) and pulsed laser deposition (PLD) on fused silica and single-crystal silicon and sapphire substrates. Using ALD, anatase thin films were grown on silica and silicon substrates at temperatures 125-425 • C. At higher deposition temperatures, mixed anatase and rutile phases grew on these substrates. Post-growth annealing resulted in anatase-to-rutile phase transitions at 750 • C in the case of pure anatase films. The films that contained chlorine residues and were amorphous in their as-grown stage transformed into anatase phase at 400 • C and retained this phase even after annealing at 900 • C. On single crystal sapphire substrates, phase-pure rutile films were obtained by ALD at 425 • C and higher temperatures without additional annealing. Thin films that predominantly contained brookite phase were grown by PLD on silica substrates using rutile as a starting material.

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Structural study of TiO2 thin films by micro-Raman spectroscopy

et al. 2006

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“…However, as reported, the intensity of this TiO 2 anatase band should be very low as compared to that at 140 cm −1 . 18,20 No bands corresponding to Ti 2 O 3 are present in the spectra, and as regards the lower oxidized phases Ti 2 O and TiO, it must be noted that they are not Raman active.…”

Section: Resultsmentioning

confidence: 99%

Microcolumn development on titanium by multipulse laser irradiation in nitrogen

et al. 2003

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We report the growth of titanium nitride microcolumns under multipulse Nd:yttrium aluminum garnet ( ‫ס‬ 1.064 m, ∼ 300 ns, ‫ס‬ 30 kHz) laser irradiation of titanium targets in nitrogen atmosphere. The laser intensity value was chosen below the single-pulse melting threshold of titanium. The evolution with the number of laser pulses of the target morphology, crystalline state, and chemical composition at the surface as well as in depth were investigated by scanning electron microscopy, x-ray diffractometry, Raman spectroscopy, and wavelength dispersive x-ray spectroscopy. Under the action of the laser pulses, during progressive surface nitridation, an initial rippled morphology developed, which evolved with further irradiation to TiN microcolumns. In-depth investigations showed a granular zone beneath the surface consisting of rutile and anatase phase TiO 2 , followed by a compact needlelike layer of titanium until the interface with the unaffected target material.

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“…Brookite nanocrystals prepared by hydrothermal treatment of titanate nanotubes exhibited photocatalytic activity for the degradation of acetaldehyde similar to that of P25 [73]. Lin et al [27] prepared high-quality brookite nanosheets surrounded with four (210), two (101), and two (201) facets. The photoactivity of these nanosheets for the degradation of methyl orange was superior to that of P25 in terms of unit specific surface area.…”

Section: Pure Brookitementioning

confidence: 95%

“…Moret et al [101] prepared thin films of TiO 2 by pulsed laser deposition at 750 °C on silicon and other substrates. The laser-ablation target was a pellet prepared from a 99.95% TiO 2 powder.…”

Section: Brookite Filmsmentioning

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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Brookite-rich titania films made by pulsed laser deposition

Cited by 138 publications

References 16 publications

Structural study of TiO2 thin films by micro-Raman spectroscopy

Structural study of TiO2 thin films by micro-Raman spectroscopy

Microcolumn development on titanium by multipulse laser irradiation in nitrogen

Brookite, the Least Known TiO2 Photocatalyst

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