Synergistic effect of doping with nitrogen and molybdenum on the photocatalytic properties of thin titania films

Ratova, Marina; West, G.T.; Kelly, Peter; Xia, Xin; Gao, Yun

doi:10.1016/j.vacuum.2014.10.012

Cited by 19 publications

(18 citation statements)

References 23 publications

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“…The estimated values of a for the as-deposited and calcinated specimens were 95 9 10 6 and 93 9 10 6 m -1 which conspicuously demonstrated a decrease after post-heat treatment. This phenomenon can be related to decrease in the thickness and transmittance upon calcination and improvement in the crystallinity [10][11][12][13][14][15].…”

Section: Optical Propertiesmentioning

confidence: 99%

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Characterization of titania thin films grown by dip-coating technique

Dastan

Panahi

Chaure

2016

J Mater Sci: Mater Electron

108

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A dip-coating technique was employed to prepare anatase phase of titania thin films. Fluorine doped tin oxide substrates were used to prepare titania thin films. The samples were annealed at 550°C for 18 h. X-ray diffraction results revealed the amorphous and anatase phases of TiO 2 for as-synthesized and annealed samples, respectively. The crystallite size of anatase TiO 2 thin films was almost 25 nm for annealed samples. UV-visible confirmed the energy band gap 3.86 and 3.64 eV for as-prepared and calcinated titania thin films. The reduction in the energy band gap could be due to the change in crystallization and agglomeration of small grains after calcination. The morphology of the prepared films was investigated by field emission scanning electron microscopy which demonstrated the agglomeration of spherical particles of TiO 2 with average particle size of about 30 nm. The molecular properties (chemical bonding) of the samples were investigated by means of Fourier Transform Infrared (FTIR) spectroscopy. FTIR analysis exhibited the formation of titania, functional group OH, hydroxyl stretching vibrations of the C-OH groups, bending vibration mode of H-O-H, alkyl C-H stretch, stretching band of Ti-OH, CN asymmetric band stretching, and C=O saturated aldehyde.

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Section: Optical Propertiesmentioning

confidence: 99%

“…The amorphous and anatase phases of titania are normally observed at temperatures lower than 300°C and the range from 350 to 700°C, respectively. Anatase phase has excellent chemical and physical properties for air and water purification [3,[10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Characterization of titania thin films grown by dip-coating technique

Dastan

Panahi

Chaure

2016

J Mater Sci: Mater Electron

108

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“…Secondly, the fast recombination rate of the photogenerated charge carriers results in low quantum efficiency of titanium dioxide as a photocatalytic material. Various strategies are being extensively studied to extend the light absorption of TiO2 into the visible region and to reduce the recombination of charge carriers, including photosensitization [4], semiconductor coupling [5,6], doping with metallic [7,8] and non-metallic elements [9,10] (typically several atomic percent or lower), etc.…”

Section: Introductionmentioning

confidence: 99%

“…However, the efficiency of p-block element doping is still under debate, as insertion of dopant impurities may accelerate the charge carrier recombination rate [12]. Nevertheless, almost all p-elements are reported to be used as TiO2 dopants to date, including nitrogen [13,14], carbon [15,16], boron [17], sulphur [18] and phosphorus [19], as well as combination of several pelements [20,21] and simultaneous doping with metallic and non-metallic elements [9,22,23].…”

Section: Introductionmentioning

confidence: 99%

Visible light active photocatalytic C-doped titanium dioxide films deposited via reactive pulsed DC magnetron co-sputtering: Properties and photocatalytic activity

Ratova

Klaysri

Praserthdam

et al. 2018

Vacuum

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Doping of TiO2 with carbon is known to be an efficient method of enhancing visible light photocatalytic activity. The present work describes the deposition of carbon-doped titania coatings deposited by reactive magnetron co-sputtering of Ti and C targets. Undoped titania coatings were produced under similar deposition conditions for comparison purposes. Following deposition, all coatings were annealed in air at 873K for 30 min to develop the required crystalline structure; and then analysed with EDS, XRD, AFM, XPS and UV-visible spectrophotometry. A number of tests, including methylene blue and stearic acid decomposition tests, and photo-induced hydrophilicity measurements, were employed for the assessment of the photocatalytic properties of the C-doped and un-doped titanium dioxide coatings under UV and visible light irradiation. It was found that carbon-doped titania coatings significantly outperformed undoped titania when using both visible and UV irradiation. Similar trends were observed for other properties. While excessive carbon doping has been shown to have a negative effect on the photocatalytic properties of the titanium dioxide, overall, carbon doping 2 via reactive co-sputtering has been confirmed as an efficient method of photocatalytic property enhancement. This is due to a narrowing of the bandgap and to extended lifetimes of the photogenerated charge carriers.

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“…For both patterned and non-patterned titania coatings, samples of equal geometrical size (25 × 15 mm 2 ) were tested to determine the dye degradation rates as a function of surface area arising from the micro-patterning. A detailed description of the test and light source irradiance pattern can be found elsewhere [16,17,38]. In brief, the testing methodology applied relies on monitoring the dye absorbance peak height; the absorbance decay, according to the Lambert-Beer law, is proportional to the concentration decay.…”

Section: Methylene Blue Degradationmentioning

confidence: 99%

Micro-Patterning of Magnetron Sputtered Titanium Dioxide Coatings and Their Efficiency for Photocatalytic Applications

2020

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Titanium dioxide thin films were deposited onto sola-lime glass substrates by reactive magnetron sputtering. Fine stainless steel mesh sheets with different aperture sizes were applied as masks over glass substrates to allow the deposition of the coatings with micro-patterned structures and, therefore, enhanced surface area. Non-patterned titania films were deposited for comparison purposes. The titanium dioxide films were post-deposition annealed at 873 K for crystallinity development and then extensively analysed by a number of analytical techniques, including scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX), optical and stylus profilometry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Vis spectroscopy. The photocatalytic activity of non-patterned and micro-patterned titania films was assessed under UV light irradiation by three different methods; namely methylene blue, stearic acid, and oleic acid degradation. The results revealed that the micro-patterned coatings significantly outperformed non-patterned titania in all types of photocatalytic tests, due to their higher values of surface area. Increasing the aperture of the stainless steel mesh resulted in lower photocatalytic activity and lower surface area values, compared to the coatings deposited through a smaller aperture mesh.

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Synergistic effect of doping with nitrogen and molybdenum on the photocatalytic properties of thin titania films

Cited by 19 publications

References 23 publications

Characterization of titania thin films grown by dip-coating technique

Characterization of titania thin films grown by dip-coating technique

Visible light active photocatalytic C-doped titanium dioxide films deposited via reactive pulsed DC magnetron co-sputtering: Properties and photocatalytic activity

Micro-Patterning of Magnetron Sputtered Titanium Dioxide Coatings and Their Efficiency for Photocatalytic Applications

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