Synthesis and characterization of brookite/anatase complex thin film

Ohara, Chiaki; Hongo, Teruhisa; Yamazaki, Atsushi; Nagoya, Toshio

doi:10.1016/j.apsusc.2008.04.030

Cited by 17 publications

(11 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This assumption is partially supported by previously reported research where migration from soda glass slide to the initial stages of growth of TiO 2 films produced only brookite TiO 2 or an incomplete phase referred to as Na 2 O.xTiO 2 . 40,41 Finally it has been reported that TiO 2 (B) synthesized from sodium-containing starting materials promotes particle needle, tube-and rod-shaped morphologies with a preferred growth direction 16,23,42,43 consistent with the needlemorphologies observed in this research. A number of research reports have indicated improved efficiencies of mixed-phase anatase and TiO 2 (B) over single phase material (either anatase or TiO 2 (B)) for the case of a number of photocatalyst reactions including: methyl orange degradation, 17 sulforhodamine B degradation, 16 methylene blue degradation, 44 active yellow XRG dye degradation, 45 nitrate reduction 15 and the water splitting reaction.…”

Section: Discussionsupporting

confidence: 70%

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)

et al. 2014

View full text Add to dashboard Cite

TiO 2 thin films were synthesized using Low Pressure Chemical Vapour Deposition (LPCVD) onto glass substrates. Titanium isopropoxide (TTIP) and N 2 gas were used as the precursor and carrier gas respectively. The effects of reaction temperature, carrier gas flow rate and deposited area were studied. SEM, TEM, powder XRD and UV-Vis and Raman spectroscopy were employed to characterize the phase and morphology of the synthesized materials. The results show that a dual phase (sodium-doped TiO 2 (B) and anatase) nanocrystalline thin film was successfully prepared by LPCVD with needle-and polygonal plate-shape crystallites respectively. At the interface with the substrate, the thin film deposit exhibited a preferr ed orientation of TiO 2 (B) needles in the [001] direction of average crystallite size 50-80 nm in length and 5-10 nm in width, whilst the crystallite size of anatase polygonal-plates was around 200 nm. The optimal LPCVD condition for preparing this mixed ph ase of TiO 2 was 550 o C (actual temperature) with a 1 mL/s N 2 flow rate. A possible mechanism for the mixed-phase formation by LPCVD on the glass substrates is described as well as the implications for the production of selfcleaning structures.

show abstract

Section: Discussionsupporting

confidence: 70%

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Authors using cathodic electrosynthesis reported the presence of rutile at T A = 700 °C . There are some reports that show that anatase is stabilized at higher temperatures by the presence of impurities . The influence of the underlying substrate in the annealing process needs to be checked.…”

Section: Resultsmentioning

confidence: 99%

“…For example, in an anatase-brookite mixture synthesized by sol-gel, Mahdjoub et al found that the amount of brookite in the mixture reaches a maximum at the intermediate annealing temperature of 200 C with traces of rutile already observed at 600 C. [6] (3) The crystallized product remains rutile-free at annealing temperatures as high as 800 C. Authors using cathodic electrosynthesis reported the presence of rutile at T A = 700 C. [9] There are some reports that show that anatase is stabilized at higher temperatures by the presence of impurities. [31][32][33] The influence of the underlying substrate in the annealing process needs to be checked.…”

Section: Resultsmentioning

confidence: 99%

Raman and XRD study on brookite–anatase coexistence in cathodic electrosynthesized titania

Campos

Spada

Paula

et al. 2011

J Raman Spectroscopy

View full text Add to dashboard Cite

Among the many methods developed for the synthesis of titanium dioxide, cathodic electrosynthesis has not received much attention because the resulting amorphous oxy‐hydroxide matrix demands a further thermal annealing step to be transformed into crystalline titania. However, the possibility of filling deep recessed templates by the control of the solid–liquid interface makes it a potentially suitable technique for the fabrication of porous scaffolds for photovoltaics and photocatalysis. Furthermore, a careful control of the crystallization process enables the growth of larger grains with lower density of grain boundaries, which act as electron traps that slow down electronic transport and promote charge recombination. In this report, well crystallized titania deposits were obtained by thermal annealing of amorphous deposits fabricated by cathodically assisted electrosynthesis on indium‐tin oxide (ITO)substrates. The combined use of Raman spectroscopy and X‐ray diffraction showed that the crystallization process is more intricate than previously assumed. It is shown that the amorphous matrix evolves into a rutile‐free mixture of brookite and anatase at temperatures as low as 200 °C that persists up to 800 °C, when pure anatase dominates. The amount of brookite in the brookite–anatase mixture reaches a maximum at 400 °C. This very simple method for obtaining a brookite–anatase mixture and the ability to tune their proportions by thermal annealing is a promising alternative whose potential for solar cells and photocatalysis deserves a careful evaluation. Copyright © 2011 John Wiley & Sons, Ltd.

show abstract

“…63.4% of brookite and 36.6% of anatase were present in a TiO 2 thin films deposited on a soda-glass substrate using a sol suspension obtained by hydrolysis of titanium tetraisopropoxide [104]. Only pure anatase was observed if the substrate was silicon.…”

Section: Brookite Filmsmentioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

View full text Add to dashboard Cite

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.

show abstract

Synthesis and characterization of brookite/anatase complex thin film

Cited by 17 publications

References 24 publications

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)

Raman and XRD study on brookite–anatase coexistence in cathodic electrosynthesized titania

Brookite, the Least Known TiO2 Photocatalyst

Contact Info

Product

Resources

About

Synthesis and characterization of brookite/anatase complex thin film

Cited by 17 publications

References 24 publications

Synthesis and characterization of mixed phase anatase TiO2 and sodium-doped TiO2(B) thin films by low pressure chemical vapour deposition (LPCVD)

Synthesis and characterization of mixed phase anatase TiO2 and sodium-doped TiO2(B) thin films by low pressure chemical vapour deposition (LPCVD)

Raman and XRD study on brookite–anatase coexistence in cathodic electrosynthesized titania

Brookite, the Least Known TiO2 Photocatalyst

Contact Info

Product

Resources

About

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)

Synthesis and characterization of mixed phase anatase TiO₂ and sodium-doped TiO₂(B) thin films by low pressure chemical vapour deposition (LPCVD)