Pure brookite titania crystals with large surface area deposited by Plasma Enhanced Chemical Vapour Deposition technique

Srivatsa, K.M.K.; Bera, Mrinmoyee; Basu, Amitabha

doi:10.1016/j.tsf.2008.02.002

Cited by 24 publications

(20 citation statements)

References 29 publications

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“…The XRD patterns of anatase have a main peak at 2ș = 25.2º corresponding to the 101 plane (JCPDS 21-1272) while the main peaks of rutile and brookite phases are at 2ș = 27.4º (110 plane) and 2ș = 30.8º (121 plane), respectively. Therefore, rutile and brookite phases have not been detected [32,33]. The XRD patterns didn't show any Co phase (even for 5% Co/TiO 2 sample) indicating that Co ions uniformly dispersed among the anatase crystallites (that was confirmed by FT-IR and SEM-EDX results, see next sections).…”

Section: Evaluation Of Photocatalytic Activity Of the Samplesmentioning

confidence: 78%

Sol-gel preparation and characterization of Co/TiO2 nanoparticles: Application to the degradation of methyl orange

Hamadanian

Reisi‐Vanani

Majedi

2010

JICS

151

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Cobalt doped titania nanoparticles were synthesized by sol-gel method using titanium(IV) isopropoxide and cobalt nitrate as precursors. X-Ray diffraction (XRD) results showed that titania and Co/TiO 2 nanoparticles only include anatase phase. The framework substitution of Co in TiO 2 nanoparticles was established by XRD, scanning electron microscopy equipped with energy dispersive X-ray microanalysis (SEM-EDX) and Fourier transform infrared (FT-IR) techniques. Transmission electron microscopy (TEM) images confirmed the nanocrystalline nature of Co/TiO 2 . The increase of cobalt doping enhanced "red-shift" in the UV-Vis absorption spectra. The dopant suppresses the growth of TiO 2 grains, agglomerates them and shifts the band absorption of TiO 2 from ultraviolet (UV) to visible region. The photocatalytic activity of samples was tested for degradation of methyl orange (MO) solutions. Although the photocatalytic activity of undoped TiO 2 was found to be higher than that of Co/TiO 2 under UV irradiation, the presence of 0.5% Co dopant in TiO 2 resulted in a catalyst with the highest activity under visible irradiation.

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Section: Evaluation Of Photocatalytic Activity Of the Samplesmentioning

confidence: 78%

Sol-gel preparation and characterization of Co/TiO2 nanoparticles: Application to the degradation of methyl orange

Hamadanian

Reisi‐Vanani

Majedi

2010

JICS

151

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“…Inorganic and organic precursors such as TiCl 4 [21,24,[49][50][51][52][53][54][55][56][57][58], Ti(SO 4 ) 2 [18,[59][60][61][62], TiOSO 4 [63,64], TiCl 3 [3,19,[65][66][67][68], TiOCl 2 [16,69,70], titanate nanotubes [69,[71][72][73], titanium tetraisopropoxide [25,[74][75][76], titanium butoxide [77][78][79][80][81] and titanium tetraethoxide [82] have been employed.…”

Section: Pure Brookite Powdersmentioning

confidence: 99%

“…The amorphous titania was successively treated with NaOH and water at 200 °C for 48 h. Titanium isopropoxide vapour, argon and oxygen mixtures were used to obtain pure brookite crystals with large surface area by plasma enhanced chemical vapour deposition (PECVD) at room temperature, under an applied d.c. bias voltage of −250 V [75]. Complex porous particles of brookite were prepared using hydrated pollen grains exposed to titanium isopropoxide solutions, followed by calcination at 500 °C for 3h [76].…”

Section: Pure Brookite Powdersmentioning

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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“…Titanium dioxide in nature exists in one of three crystalline forms, anatase, rutile and brookite, and in thin film form, its structure is known to be highly sensitive to deposition conditions. Rutile is the thermodynamically stable form of titania; anatase is transformed to rutile at high deposition or post-annealing temperatures (in most cases above 700 °C) [7][8][9][10][11][12][13][14]. Brookite is very rarely found in thin film form.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity of Reactively Sputtered Titania Coatings Deposited Using a Full Face Erosion Magnetron

et al. 2013

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Titanium dioxide (titania) is widely used as a photocatalyst for its moderate band gap, high photoactivity, recyclability, nontoxicity, low cost and its significant chemical stability. The anatase phase of titania is known to show the highest photocatalytic activity, however, the presence of this phase alone is not sufficient for sustained activity. In this study TiO 2 coatings were deposited onto glass substrates by mid-frequency pulsed magnetron sputtering from metallic targets in reactive mode using a Full Face Erosion (FFE) magnetron, which allows the magnetic field to be modulated during the deposition process. The as-deposited coatings were analysed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and micro-Raman spectroscopy. Selected coatings were then annealed at temperatures in the range of 400-700 °C and re-analysed. The photocatalytic activity of the coatings was investigated through measurements of the degradation of organic dyes, such as methyl orange, under the influence of UV and fluorescent light sources. It has been demonstrated that, after annealing, the pulsed magnetron sputtering process produced photo-active surfaces and that the activity of the coatings under exposure to fluorescent lamps was some 35%-45% of that observed under exposure to UV lamps.

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Pure brookite titania crystals with large surface area deposited by Plasma Enhanced Chemical Vapour Deposition technique

Cited by 24 publications

References 29 publications

Sol-gel preparation and characterization of Co/TiO2 nanoparticles: Application to the degradation of methyl orange

Sol-gel preparation and characterization of Co/TiO2 nanoparticles: Application to the degradation of methyl orange

Brookite, the Least Known TiO2 Photocatalyst

Photocatalytic Activity of Reactively Sputtered Titania Coatings Deposited Using a Full Face Erosion Magnetron

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