Influence of the nitriding process on the band-gap of TiO2 thin films with phase mixture

Camps, E.; Castrejón-Sánchez, V.H.; Camacho-López, M.A.; Basurto, Rafael

doi:10.1016/j.tsf.2014.09.059

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…Eg values of the thinner films are slightly higher than that of the thicker films. On thin films, as the reported band‐gap values of the pure anatase and rutile phases are in the range (3.3–3.2 eV) and (3.1–3.0 eV), respectively, , the decrease of the optical band‐gap versus the thickness supports the phase variation from anatase to rutile, as observed on the XRD patterns (Fig. ).…”

Section: Resultssupporting

confidence: 63%

Effect of Titanium Dioxide Film Thickness on Photocatalytic and Bactericidal Activities Against Listeria monocytogenes

Barthomeuf¹,

Castel

Gendre

et al. 2019

Photochem & Photobiology

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Structural, microstructural and bactericidal surface properties of TiO 2 -coated glass substrates elaborated by reactive Radiofrequency sputtering are investigated. As pathogenic bacteria in biofilms are a major concern in food industries due to their growing resistance to cleaning and sanitizing procedures, the development of photoactive surfaces exhibiting bactericidal properties is acknowledged as an effective approach to tackle bacterial contaminations. Our principal aim concerns the study of the photoactive top-layer thickness impact (from 80 nm to~500 nm) on Listeria monocytogenes. Structural characterization of the TiO 2 layers demonstrates that anatase and rutile phases are both present, depending on the film thickness. Photocatalytic activity of the samples has been evaluated through the degradation of aqueous methylene blue (MB) solutions under UVA light illumination for various time periods. The results show an efficiency rating increase according to TiO 2 film thickness up to a threshold value close to 400 nm. Moreover, a significant decrease of the adherent bacteria number is observed after 20 min of UVA illumination. The quantitative study of the bactericidal activity associated with scanning electron microscopy observations of the postprocess bacteria damaged cells demonstrates the efficiency of the 240-nm-thick TiO 2 coating sample. The results are correlated with the production of hydroxyl radicals during the process of photocatalysis.

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Section: Resultssupporting

confidence: 63%

Effect of Titanium Dioxide Film Thickness on Photocatalytic and Bactericidal Activities Against Listeria monocytogenes

Barthomeuf¹,

Castel

Gendre

et al. 2019

Photochem & Photobiology

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“…However, for the visible range of the spectrum, TiO 2 does not have photocatalytic activity due to its wide bandgap (3.2 eV in case of anatase) [5,6]. In order to activate photodegradation in the visible range, which would make this process cheaper by using solar light, TiO 2 can be combined with different materials to produce ternary compounds, doping [1,[6][7][8][9][10], nitriding [11], decorating [2] or composites fabrication [7]. The synergetic activity of the external element or compound and the TiO 2 matrix enhances visible light absorption and thus photocatalysis can be produced.…”

Section: Introductionmentioning

confidence: 99%

UV and Visible light photodegradation of methylene blue with graphene decorated titanium dioxide

Acosta-Esparza

Rivera

Pérez-Centeno

et al. 2020

Mater. Res. Express

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Photocatalytic degradation of methylene blue by graphene decorated titanium dioxide (TiO 2 ) powders heated at different temperatures was analyzed. The powders were prepared by mixing TiO 2 with graphene prepared by the modified Hummers method. A thermal treatment was applied to mixed and pure TiO 2 powders with the aim of analyze their structural dependence on temperature, and consistently their photocatalytic degradation effect on methylene blue solutions exposed to UV and visible radiation. Structural characterization of the powders was carried out by x-ray diffraction and Raman spectroscopy. When irradiated with UV, the mixed powders showed as high as 87% photocatalytic degradation, while the pure TiO 2 reached values of 59%. For visible radiation, as it is expected, the pure TiO 2 showed no activity, while the mixture presented degradation of 40%.

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“…However as nitrogen incorporation in TiO2 is proportional to the increase in treatment temperature [22,23]. Temperatures over 600 °C are required usually leading to phase change, to the undesirable rutile phase, and promoting the collapse of the nanotubes into nanoparticles (NP), that have higher pair electron-hole recombination [24][25][26]. In this way, lower temperature processes are highly desirable.…”

Section: Introductionmentioning

confidence: 99%

A Microfluidic Device Based on Plasma Nitrided Self-Organized TiO2 Nanotubes for Photocatalytic Reduction Study

Bonelli

Pereyra

2018

JICS

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Nitrided TiO2 nanotubes and PDMS microchannel were assembled in a photocatalytic device for organic dyes photo-degradation studies. By integrating a PDMS microchannel with the nitrided TiO2 nanotubes array, a microfluidic photocatalytic device was obtained and characterized by morphological, chemical, and physical points of view. The fabrication process allows an easy integration of the obtained nitrided TiO2 nanotubes with a microchannel into a microfluidic device for pollutant photo-degradation. The high surface-to-volume ratio intrinsic of nanotubes structures has functional properties for harvesting light and is responsible for part of the interesting photocatalytic device performance. Another great advantage of nitrided TiO2 nanotubes compared to just TiO2 nanotubes, is the lower gap of 2.80 eV achieved by plasma nitriding processes in PECVD reactor, which leads to a 14% increase in the photocatalytic response to sun light. As a consequence, the methylene blue reduction efficiency of the microfluidic device fabricated with nitrided TiO2 nanotubes increased 13% compared to that with just anodized TiO2 nanotubes.

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Influence of the nitriding process on the band-gap of TiO2 thin films with phase mixture

Cited by 12 publications

References 16 publications

Effect of Titanium Dioxide Film Thickness on Photocatalytic and Bactericidal Activities Against Listeria monocytogenes

Effect of Titanium Dioxide Film Thickness on Photocatalytic and Bactericidal Activities Against Listeria monocytogenes

UV and Visible light photodegradation of methylene blue with graphene decorated titanium dioxide

A Microfluidic Device Based on Plasma Nitrided Self-Organized TiO2 Nanotubes for Photocatalytic Reduction Study

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