Visible-light photocatalytic activity of nitrogen-doped TiO2 thin film prepared by pulsed laser deposition

Zhao, Lei; Jiang, Q.; Lian, Jianshe

doi:10.1016/j.apsusc.2008.01.069

Cited by 89 publications

(43 citation statements)

References 33 publications

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“…If the bandgap of TiO2 is reduced, lower energy photons may be absorbed by the catalyst and the photocatalytic activity could increase roughly proportional to the increase in the absorbed solar spectrum [10]. Extending the activity into the visible range generally requires doping of the titania with, for example, Fe [9], or N [11], whilst doping with for example; W or Nb increases photocatalytic efficiency [12,13].…”

Section: Introductionmentioning

confidence: 99%

An Investigation into W or Nb or ZnFe2O4 Doped Titania Nanocomposites Deposited from Blended Powder Targets for UV/Visible Photocatalysis

et al. 2013

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Abstract:The photocatalytic behavior of titania coatings is largely determined by their crystalline structure. Depending on deposition conditions, though, titania may form amorphous, brookite, anatase or rutile structures, with anatase or anatase/rutile mixed phase structures showing the highest levels of activity. Anatase is activated by UV light and, consequently, there is a great deal of interest in doping titania films to both increase activity and extend it into the visible range. In this study, titania and doped titania coatings have been deposited from blended oxide powder targets. This highly versatile and economical technique allows dopant levels to be readily varied. Using this technique, titania coatings doped with W, Nb and ZnFe2O4 have been deposited onto glass substrates by pulsed magnetron sputtering. The as-deposited coatings were analyzed 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-analyzed. Structural transformation of the titania coatings was initiated in the 500-600 °C range, with the coatings annealed at 700 °C having predominantly anatase structures. The photocatalytic activity of the coatings was assessed through OPEN ACCESSCoatings 2013, 3 154 measurements of the degradation of organic dyes, such as methyl orange, under the influence of UV and fluorescent light sources. It was found that, after annealing, coatings with photo-active surfaces were produced and that activity varied with dopant content. Activity levels under fluorescent light irradiation were up to 60% of the activity measured under UV irradiation.

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Section: Introductionmentioning

confidence: 99%

An Investigation into W or Nb or ZnFe2O4 Doped Titania Nanocomposites Deposited from Blended Powder Targets for UV/Visible Photocatalysis

et al. 2013

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“…In this study, TiO 2 coatings were deposited onto glass substrates by mid-frequency (100-350 kHz) pulsed magnetron sputtering from metallic targets in reactive mode [15][16][17][18][19][20][21][22][23]. This technique is known to produce all forms of titania surfaces including highly photo-active anatase [24].…”

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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“…Various deposition techniques, e.g. pulsed laser deposition (PLD) [15][16][17], sol-gel methods [18][19][20], ion-assisted electron beam evaporation [21,22], magnetron sputtering [10,[23][24][25][26][27][28][29][30][31][32][33][34] have been employed to prepare TiO x N y thin films. Owing to its numerous advantages, magnetron sputtering deposition is a well established method for coating which has been already extended to the industry.…”

Section: Introductionmentioning

confidence: 99%

Effect of nitrogen doping on TiO_xN_y thin film formation at reactive high-power pulsed magnetron sputtering

Straňák¹,

Quaas²,

Bogdanowicz³

et al. 2010

J. Phys. D: Appl. Phys.

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To cite this version:Vitezslav Stranak, Marion Quaas, Robert Bogdanowicz, Hartmut Steffen, Harm Wulff, et al.. Effect of nitrogen doping on TiOxNy thin film formation at reactive high-power pulsed magnetron sputtering. Journal of Physics D: Applied Physics, IOP Publishing, 2010, 43 (28) AbstractThe paper is focused on a study of formation of TiO x N y thin films prepared by pulsed magnetron sputtering of metallic Ti target. Oxygen and nitrogen were delivered into the discharge in the form of reactive gases O 2 and N 2 . The films were deposited by high-power impulse magnetron sputtering working with discharge repetition frequency f = 250 Hz at low (p = 0.75 Pa) and high (p = 10 Pa) pressure. The substrates were on floating potential and thermally stabilized at room temperature during deposition process. Post-deposition thermal annealing was not employed. The chemical composition from XPS diagnostic reveals formation of TiO x N y structure at low flow rate of oxygen in the discharge gas mixture. This result is confirmed by XRD investigation of N elements incorporation into the Ti-O lattice. Decrease of band-gap to values Eg ∼ 1.6 eV in TiOxNy thin film is attributed to formed Ti-N bonds. The discharge properties were investigated by time-resolved optical emission spectroscopy. Time evolution of particular spectral lines (Ar + , Ti + , Ti) is presented together with peak discharge current.

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Visible-light photocatalytic activity of nitrogen-doped TiO2 thin film prepared by pulsed laser deposition

Cited by 89 publications

References 33 publications

An Investigation into W or Nb or ZnFe2O4 Doped Titania Nanocomposites Deposited from Blended Powder Targets for UV/Visible Photocatalysis

An Investigation into W or Nb or ZnFe2O4 Doped Titania Nanocomposites Deposited from Blended Powder Targets for UV/Visible Photocatalysis

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

Effect of nitrogen doping on TiO_xN_y thin film formation at reactive high-power pulsed magnetron sputtering

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