Single-crystal TiO<sub>2</sub> nanowires by seed assisted thermal oxidation of Ti foil: synthesis and photocatalytic properties

Arcadipane, E.; Sanz, R.; Amiard, Guillaume; Boninelli, Simona; Impellizzeri, G.; Bonkerud, Julie; Bhoodoo, Chidanand; Vines, Lasse; Svensson, B. G.; Romano, Lucia

doi:10.1039/c6ra09088e

Cited by 6 publications

(4 citation statements)

References 34 publications

(28 reference statements)

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“…TiO 2 rutile monocrystalline nanowires by thermal oxidation were also btained by Arcadipane et al [90], showing an improvement of photocatalytic activity compared to a reference TiO 2 bulk sample.…”

Section: Oxidation Methodsmentioning

confidence: 75%

Titanium Dioxide in Chromogenic Devices: Synthesis, Toxicological Issues, and Fabrication Methods

2020

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The use of titanium dioxide (TiO2) within two specific classes of devices, namely electrochromic and photoelectrochromic, is described hereafter, with respect to its inherent properties and chromogenic features within architectures that have appeared so far, in this field. The new research trends, involving the applications of TiO2 in chromogenic materials are reported, with particular attention paid to the techniques used for film deposition as well as the synthesis of nanoparticles. Furthermore, the main studies concerning its chemical-physical properties and approaches to its chemical syntheses and fabrication are reviewed, with special regard to “green” routes. In addition, the main aspects relating to toxicological profiles are exposed, with reference to nanoparticles and thin films.

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Section: Oxidation Methodsmentioning

confidence: 75%

Titanium Dioxide in Chromogenic Devices: Synthesis, Toxicological Issues, and Fabrication Methods

2020

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“…For example, the use of noble metals (e.g., Pt or Au) enhances the photoactivity by improving the charge separation of electrons and holes, through the formation of a Schottky junction at the metal/semiconductor interface [9][10][11][12][13]. Nanostructuration of the photocatalyst, and, in particular, the formation of nanowires, can be considered an effective pathway to increase the water-TiO 2 contact area and to reduce the time needed for the charges to reach the surface (preventing detrimental electron-hole recombination) [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Photochemical Properties of Monolithic TiO2 Nanowires Diode

et al. 2021

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In this paper, the structural and photochemical properties of a monolithic photochemical diode are discussed. The present structure is composed, from the top to the bottom, of a TiO2 nanowire layer, a TiO2 film, a Ti foil, and a porous layer made of Pt nanoparticles. The synthesis of the nanowires was simply carried out by Au-catalysed-assisted process; the effects of the annealing temperature and time were deeply investigated. Morphological and structural characterizations were performed by scanning electron microscopy and Raman spectroscopy. The analyses showed the rutile structure of the TiO2 nanowires. The photocatalytic properties were studied through the degradation of methylene blue (MB) dye under UV light irradiation. The nanowires induced an enhancement of the photo-degradation rate, compared to TiO2 in a bulk form, due to an increase in the surface area. Moreover, the presence of a nano-porous Pt layer deposited on the rear side of the samples provided a further increase in the MB degradation rate, related to the scavenging effect of Pt nanoparticles. The overall increment of the photo-activity, due to the nano-structuration of the TiO2 and to the presence of the Pt layer, resulted a factor 7, compared to the bulk reference. In addition, photovoltage measurements allowed to assess the effects of TiO2 nano-structuration and Pt nanoparticles on the electron accumulation.

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“…Deep-level transient spectroscopy (DLTS) is a powerful method for investigation of electrically-active defects [20]. However, reports regarding DLTS on defects in TiO 2 are scarce [21][22][23]. One reason for this is the challenge of fabricating high quality Schottky barrier diodes (SBDs) on TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Electrically-active defects in reduced and hydrogenated rutile TiO2

Bonkerud

Zimmermann

Herklotz

et al. 2020

Semicond. Sci. Technol.

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We report on electrically-active defects located between 0.054 and 0.69 eV below the conduction band edge in rutile T i O 2 single crystals subjected to reducing and hydrogenating heat treatments. Deep-level transient spectroscopy measurements recorded on T i O 2 samples subjected to different heat treatments are compared. In samples annealed in H 2 gas, three defect levels are commonly observed. One of these levels, E 192 , located 0.43 eV below the conduction band edge is tentatively assigned to a hydrogen-impurity complex. Two levels at 0.054 and 0.087 eV below the conduction band edge, which were present after all different heat treatments, are tentatively assigned as being related to O vacancies or Ti self-interstitials. Deep-level transient spectroscopy spectra of samples heat-treated in N 2 display a larger number of defect levels and larger concentrations compared to samples heat-treated in H 2 gas. N 2 treatments are performed at considerably higher temperatures. Four energy levels located between 0.28 and 0.69 eV, induced by annealing in N 2 , are tentatively attributed to O vacancy- or Ti interstitial-related complexes with impurities.

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Single-crystal TiO₂ nanowires by seed assisted thermal oxidation of Ti foil: synthesis and photocatalytic properties

Abstract: TiO2 nanowires growth was investigated varying the synthesis parameters. Nanowires demonstrated improved photocatalytic activity, especially when treated in forming gas.

Cited by 6 publications

References 34 publications

Titanium Dioxide in Chromogenic Devices: Synthesis, Toxicological Issues, and Fabrication Methods

Titanium Dioxide in Chromogenic Devices: Synthesis, Toxicological Issues, and Fabrication Methods

Synthesis and Photochemical Properties of Monolithic TiO2 Nanowires Diode

Electrically-active defects in reduced and hydrogenated rutile TiO2

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Single-crystal TiO2 nanowires by seed assisted thermal oxidation of Ti foil: synthesis and photocatalytic properties

Abstract: TiO2 nanowires growth was investigated varying the synthesis parameters. Nanowires demonstrated improved photocatalytic activity, especially when treated in forming gas.

Cited by 6 publications

References 34 publications

Titanium Dioxide in Chromogenic Devices: Synthesis, Toxicological Issues, and Fabrication Methods

Titanium Dioxide in Chromogenic Devices: Synthesis, Toxicological Issues, and Fabrication Methods

Synthesis and Photochemical Properties of Monolithic TiO2 Nanowires Diode

Electrically-active defects in reduced and hydrogenated rutile TiO2

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Product

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Single-crystal TiO₂ nanowires by seed assisted thermal oxidation of Ti foil: synthesis and photocatalytic properties