Structural and vibrational investigations of Nb-doped TiO2 thin films

Uyanga, E.; Gibaud, Alain; Daniel, Philippe; Sangaa, D.; Sevjidsuren, G.; Altantsog, P.; Beuvier, Thomas; Lee, Chih‐Hao; Балагуров, А. М.

doi:10.1016/j.materresbull.2014.08.035

Cited by 30 publications

(8 citation statements)

References 31 publications

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“…Few studies show that the presence of a suitable doping agent strongly affects the kinetics of this process. Indeed, some metal species can occupy interstitial positions or induce structural changes in metal oxide structures, as is the case of Nb, V, and Ce loaded onto TiO 2 . In accordance with EDX results, it is very likely that the presence of Y or Zr in TiO 2 aerosols affects the kinetic of this process and the freezing of the rutile phase.…”

Section: Resultssupporting

confidence: 62%

The behaviour of parent and daughter nuclides in aerosols released in radiological dispersion events: a study of a SrTiO3 source

Maris

Naji

Lemma

et al. 2017

J Raman Spectroscopy

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During rapid high-temperature events, like a terrorist attack with radiological dispersal device, radiological material will be released into the environment. In these scenarios, the ratio between parent and daughter nuclides can be used for nuclear forensic investigations to determine the age of the used radioactive source. We have used fast laser heating to produce aerosols of a material often found in radioisotope thermoelectric generators. To investigate the behaviour of SrTiO 3 , we have recreated pure and mixed samples, mimicking several parent-to-daughter ratios. By combining scanning electron microscopy and energy-dispersive X-ray spectroscopy analysis with Raman spectroscopy, we were able to distinguish different elements and phases present in the aerosols. Two types of aerosols have been identified: individual aerosols from a few micrometre to a few tens of micrometre and agglomerates of smaller aerosols from a few hundred nanometre to a few micrometre. The bigger aerosols, formed from mechanically expelled liquefied material, showed a parent-to-daughter ratio that stays close to the value that would be anticipated by the initial composition of the material, but in the agglomerates, formed from vaporised material, the presence of the daughter elements reduces significantly due to differences in the condensation behaviour.

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Section: Resultssupporting

confidence: 62%

The behaviour of parent and daughter nuclides in aerosols released in radiological dispersion events: a study of a SrTiO3 source

Maris

Naji

Lemma

et al. 2017

J Raman Spectroscopy

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“…The generated states at the bottom of the CB, due to Nb and Ta, slightly extend the optical absorption range, enhance the photocatalytic efficiency, and increase the conductivity. Experimental results indeed have shown that V and Nb dopants decrease the bandgap of pristine TNT [27], and of thin films [58]. It is worth mentioning that the reduced bandgap of TNT due to doping with Nb is very similar to the reduced bandgap of TiO 2 thin films with the same dopant, namely 0.3 eV.…”

Section: Electronic Structurementioning

confidence: 59%

Electronic and optical properties of metal-doped TiO$_2$ nanotubes: Spintronic and photocatalytic applications

Fadlallah,

Eckern

2020

Preprint

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Due to their characteristic geometry, TiO 2 nanotubes (TNTs), suitably doped by metalsubstitution to enhance their photocatalytic properties, have a high potential for applications such as clean fuel production. In this context, we present a detailed investigation of the magnetic, electronic, and optical properties of transition-metal doped TNTs, based on hybrid density functional theory. In particular, we focus on the 3d, the 4d, as well as selected 5d transition-metal doped TNTs. Thereby, we are able to explain the enhanced optical activity and photocatalytic sensitivity observed in various experiments. We find, for example, that Cr-and W-doped TNTs can be employed for applications like water splitting and carbon dioxide reduction, and for spintronic devices. The best candidate for water splitting is Fe-doped TNT, in agreement with experimental observations. In addition, our findings provide valuable hints for future experimental studies of the ferromagnetic/spintronic behavior of metal-doped titania nanotubes.

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“…As a matter of fact, the Ti 2p peaks for the Nb‐doped sample was shifted toward a higher binding energy from 458.7 to 458.9 eV. Such behavior was attributed to a difference in electronegativity between the Ti and Nb ions, and/or the possible formation of Nb‐O‐Ti chemical bonds . Figure (C) displays the high‐resolution Nb 3d spectra, making it possible to identify Nb 3d 3/2 and Nb 3d 5/2 peaks with Nb 3d 5/2 binding energy at 207.3 eV and spin‐orbit splitting of 2.7 eV, which is close to the standard value for Nb 5+ ions .…”

Section: Resultsmentioning

confidence: 98%

The Role of Nb Addition in TiO₂ Nanoparticles: Phase Transition and Photocatalytic Properties

Silva

Avansi

Catto

et al. 2018

Physica Status Solidi (a)

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This paper reports an experimental investigation on the effects of Nb addition on the phase transformation and photocatalytic properties of TiO2 nanoparticles. Differential thermal analysis, Raman spectroscopy, X‐ray diffraction measurements reveal that Nb addition retarded the anatase‐to‐rutile phase transition. Photocatalysis experiments indicate an enhancement of the degradation of methylene blue and rhodamine B dyes with the addition of Nb to TiO2 lattice. This behavior was attributed to the presence of Nb ions acting as active sites formers as well as the removal of organic species, since the presence of hydroxyls groups remained unchanged, as revealed by X‐ray photoelectron spectroscopy.

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Structural and vibrational investigations of Nb-doped TiO2 thin films

Cited by 30 publications

References 31 publications

The behaviour of parent and daughter nuclides in aerosols released in radiological dispersion events: a study of a SrTiO3 source

The behaviour of parent and daughter nuclides in aerosols released in radiological dispersion events: a study of a SrTiO3 source

Electronic and optical properties of metal-doped TiO$_2$ nanotubes: Spintronic and photocatalytic applications

The Role of Nb Addition in TiO₂ Nanoparticles: Phase Transition and Photocatalytic Properties

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Structural and vibrational investigations of Nb-doped TiO2 thin films

Cited by 30 publications

References 31 publications

The behaviour of parent and daughter nuclides in aerosols released in radiological dispersion events: a study of a SrTiO3 source

The behaviour of parent and daughter nuclides in aerosols released in radiological dispersion events: a study of a SrTiO3 source

Electronic and optical properties of metal-doped TiO$_2$ nanotubes: Spintronic and photocatalytic applications

The Role of Nb Addition in TiO2 Nanoparticles: Phase Transition and Photocatalytic Properties

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The Role of Nb Addition in TiO₂ Nanoparticles: Phase Transition and Photocatalytic Properties