Microstructure and bactericidal ability of photocatalytic TiO2 thin films prepared by rf helicon magnetron sputtering

Liu, Miao; Tanemura, Sakae; Kondo, Yoichi; Iwata, Misao; Toh, Shoichi; Kaneko, Kenji

doi:10.1016/j.apsusc.2004.05.193

Cited by 70 publications

(31 citation statements)

References 8 publications

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“…Several studies have been carried out to investigate the effect of crystal structure on the photocatalytic performance of TiO 2 . Whilst some studies have found a higher activity of the anatase form [15,16], others have reported the mixed phase anatase/rutile to show a better photocatalytic performance [17]. Comparative studies of single phase anatase and rutile TiO 2 have concluded that the photocatalytic activity is dependent on the reaction being studied and different kinetics and intermediaries may be produced in each case [18,19].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

et al. 2014

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TiO 2 coatings deposited using reactive magnetron sputtering and spray coating methods, as well as Ag-and Mo-doped TiO 2 coatings were investigated as self-cleaning surfaces for beverage processing. The mechanical resistance and retention of the photocatalytic properties of the coatings were investigated over a three-month period in three separate breweries. TiO 2 coatings deposited using reactive magnetron sputtering showed better mechanical durability than the spray coated surfaces, whilst the spray-deposited coating showed enhanced retention of photocatalytic properties. The presence of Ag and Mo dopants improved the photocatalytic properties of TiO 2 as well as the retention of these properties. The spray-coated TiO 2 was the only coating which showed light-induced hydrophilicity, which was retained in the coatings surviving the process conditions. OPEN ACCESSCoatings 2014, 4 434

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Section: Introductionmentioning

confidence: 99%

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

et al. 2014

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“…45 Various methods such as metal or non-metal doping, using 46 reduced forms of TiO X (X < 2) photocatalyst, dye sensiti-zation, and optimization of phase composition has been 48 investigated by previous researchers. 11-13 49 Titania doped with main group elements has attracted 50 great interest after the report of nitrogen and other anion 51 (S, C, and F) doped visible-light active (VLA) titania cata-52 lyst by Asahi and co-workers. 14 These second-generation 53 TiO 2 materials were photoactive over the UV and visible- 54 light region.…”

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confidence: 99%

Highly Visible Light Active TiO_2−xN_x Heterojunction Photocatalysts

Seery²,

et al. 2010

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Nitrogen doped anatase-rutile heterojunctions are successfully synthesized through an ethylenediaminetetraacetic acid (EDTA) modified sol−gel process. An FT-IR study of EDTA modified TiO2 gel confirms the existence of an ionic intermediate (as indicated by a Δν value of 233 cm−1). Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman spectroscopy are employed to study the phase evolution, phase purity, and crystallite size of samples. Formations of O−Ti−N and N−Ti−N bonds in calcined samples are confirmed using XPS and FT-IR spectroscopy. All EDTA modified samples show significantly higher visible light photocatalytic activity than the unmodified sample. The most active nitrogen doped heterojunction obtained at 400 °C exhibits 9-fold visible light activity in comparison to the standard photocatalyst Degussa P-25. It is proposed that the photo excited electrons (from the visible midgap level) are effectively transferred from the conduction band of anatase to that of rutile causing effective electron−hole separation, which is responsible for the higher visible light activity and lower photoluminescence (PL) intensity.

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“…However, there are several problems which prevent a higher utilization of the TiO 2 photocalyst. A photoexcitation of an electron-hole pair by photons with wavelengths less than 385 nm (UV light region) is required due to an optical bandgap energy E g = 3.2 eV for the TiO 2 anatase phase [4]. The photoexcitated electrons and holes play a crucial role in the photocatalytic and hydrophilic behaviour of the TiO 2 films.…”

Section: Introductionmentioning

confidence: 99%

High-rate low-temperature dc pulsed magnetron sputtering of photocatalytic TiO2films: the effect of repetition frequency

et al. 2007

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The article reports on low-temperature high-rate sputtering of hydrophilic transparent TiO 2 thin films using dc dual magnetron (DM) sputtering in Ar + O 2 mixture on unheated glass substrates. The DM was operated in a bipolar asymmetric mode and was equipped with Ti(99.5) targets of 50 mm in diameter. The substrate surface temperature T surf measured by a thermostrip was less than 180°C for all experiments. The effect of the repetition frequency f r was investigated in detail. It was found that the increase of f r from 100 to 350 kHz leads to (a) an improvement of the efficiency of the deposition process that results in a significant increase of the deposition rate a D of sputtered TiO 2 films and (b) a decrease of peak pulse voltage and sustaining of the magnetron discharge at higher target power densities. It was demonstrated that several hundreds nm thick hydrophilic TiO 2 films can be sputtered on unheated glass substrates at a D = 80 nm/min, T surf < 180°C when high value of f r = 350 kHz was used. Properties of a thin hydrophilic TiO 2 film deposited on a polycarbonate substrate are given.

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Microstructure and bactericidal ability of photocatalytic TiO2 thin films prepared by rf helicon magnetron sputtering

Cited by 70 publications

References 8 publications

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

Highly Visible Light Active TiO_2−xN_x Heterojunction Photocatalysts

High-rate low-temperature dc pulsed magnetron sputtering of photocatalytic TiO2films: the effect of repetition frequency

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Microstructure and bactericidal ability of photocatalytic TiO2 thin films prepared by rf helicon magnetron sputtering

Cited by 70 publications

References 8 publications

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

Highly Visible Light Active TiO2−xNx Heterojunction Photocatalysts

High-rate low-temperature dc pulsed magnetron sputtering of photocatalytic TiO2films: the effect of repetition frequency

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Highly Visible Light Active TiO_2−xN_x Heterojunction Photocatalysts