Chemistry in a confined space: characterization of nitrogen-doped titanium oxide nanotubes produced by calcining ammonium trititanate nanotubes

Chang, Jui-Chun; Tsai, Wei-Je; Chiu, Tsai-Chin; Li, Youfu; Chao, Jiunn‐Hsing; Lin, Chun-Ping

doi:10.1039/c0jm03058a

Cited by 28 publications

(18 citation statements)

References 41 publications

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“…However, in order to confirm the presence of TiO 2 on the surface of the titanium alloy, we have used diffuse reflectance infrared a Fourier transform spectroscopy (DRIFT) method. In these spectra, in all cases we found an intensive absorption band in the range of 750–890 cm −1 , which can be attributed to lattice TiO 2 modes: ν(Ti–O) and δ(Ti–O) [ 7 , 26 , 27 , 28 ]. This band confirms the formation of a TiO 2 layer on the substrates surface ( Figure 6 ).…”

Section: Resultsmentioning

confidence: 88%

Novel Titania Nanocoatings Produced by Anodic Oxidation with the Use of Cyclically Changing Potential: Their Photocatalytic Activity and Biocompatibility

2018

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The anodic oxidation of Ti6Al4V substrate surfaces with the use of cyclically changing potential enabled the production of novel titania nanocoatings. Morphologically different coatings were prepared in the ethylene glycol-based electrolyte with diluted HF and various amounts of water. The structure of the produced surface materials was characterized by X-ray diffraction, Raman spectroscopy, and diffuse reflectance infrared Fourier transform spectroscopy. Their morphology was visualized by scanning electron microscopy. The photocatalytic efficiency of produced materials was studied by the observation of methylene blue degradation under UV irradiation. Their biointegration properties were established on the basis of immunological assays, which checked murine fibroblasts adhesion and proliferation on novel coatings. The obtained results pointed out to both high biocompatibility, as well as the photoactivity of one of the obtained nanocoatings, allowing trusting in the applicative nature of this material.

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Section: Resultsmentioning

confidence: 88%

Novel Titania Nanocoatings Produced by Anodic Oxidation with the Use of Cyclically Changing Potential: Their Photocatalytic Activity and Biocompatibility

2018

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“…Then one can obtain the band gaps from the UV–vis absorption spectra. For alkali titanates with indirect transition, the band gaps can be evaluated from the absorption spectra by using the equation

{(α h v)}^{1 / 2} = A (h v - E_{normalg}),

where α , hν , A , and E g are the absorption coefficient, the incident photon energy near the band edge, a constant, and the band gap, respectively. According to Eq.…”

Section: Resultsmentioning

confidence: 99%

“…They suggested that NH 4 + ions can also be incorporated into the interlayers of HTNTs. Subsequently, Chang et al reported the effect of enhancing visible light absorption of NH 4 + ions on the NH 4 + ‐doped titanate nanotubes. Although it was reported that both the transition metal and NH 4 + ions can reduce the band gaps of HTNTs, their co‐doping effect on the enhanced optical properties of HTNTs in the visible light region is not clear.…”

Section: Introductionmentioning

confidence: 99%

Origin of the visible light absorption of Co²⁺ and NH₄⁺ co‐doped hydrogen titanate nanotube thin films

An¹,

Wang³

et al. 2013

Physica Status Solidi (b)

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Hydrogen titanate nanotube (HTNT) thin films were synthesized by hydrothermal method and then Co 2þ and NH þ 4 codoped hydrogen titanate nanotube (Co, N-HTNT) thin films were prepared by ion-exchange method. The Co, N-HTNT thin films exhibit strong absorption in the visible light range compared with the HTNT and NH þ 4 doped hydrogen titanate nanotube (N-HTNT) thin films. The first-principles calculations reveal that NH þ 4 doping has no effect on the visible light absorption of HTNTs. The red shift of Co, N-HTNTs is only due to the mixture of the Co 3d and O 2p states in the top of the valence band, which results in the band gap narrowing. Relative to HTNTs and N-HTNTs, both the valence band maximum (VBM) and conduction band minimum (CBM) of Co, N-HTNTs shift to lower potential based on the valence band XPS spectra. Furthermore, the up-shift of the VBM is much larger than that of the conduction band, which can result in band gap reduction explaining the origin of the visible light absorption of Co, N-HTNTs.

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“…The kinetics of photodecolourisation of RhB using the synthesised photocatalysts follows the zero-order rate law, 28,29 shown in Figure 6a, which can be expressed as follows: In order to uncover the mechanisms of photodegradation, the reactive radicals during photodegradation were detected through the addition of various radical scavengers. EDTA was selected as a hole scavenger and ethanol was chose as a hydroxyl radical scavenger.…”

Section: Assessment Of Photocatalytic Activitymentioning

confidence: 99%

Enhanced Photocatalytic Activity of Heterostructured Ferroelectric BaTiO₃/α-Fe₂O₃ and the Significance of Interface Morphology Control

Cui

Briscoe

Wang

et al. 2017

ACS Appl. Mater. Interfaces

150

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We have used a ferroelectric BaTiO substrate with a hematite (α-FeO) nanostructured surface to form a heterogeneous BaTiO/α-FeO photocatalyst. In this study we show that varying the mass ratio of α-FeO on BaTiO has a significant influence on photoinduced decolorization of rhodamine B under simulated sunlight. The highest photocatalytic activity was obtained for BaTiO-FeO-0.001M, with the lowest mass ratio of α-FeO in our study. This catalyst exhibited a 2-fold increase in performance compared to pure BaTiO and a 5-fold increase when compared to the higher-surface-area pure α-FeO. The increases in performance become more marked upon scaling for the lower surface area of the heterostructured catalyst. Performance enhancement is associated with improved charge-carrier separation at the interface between the ferroelectric surface, which exhibits ferroelectric polarization, and the hematite. Increasing the mass ratio of hematite increases the thickness of this layer, lowers the number of triple-point locations, and results in reduced performance enhancement. We show that the reduced performance is due to a lack of light penetrating into BaTiO and to relationships between the depolarization field from the ferroelectric and carriers in the hematite. Our findings demonstrate that it is possible to use the built-in electric field of a ferroelectric material to promote charge-carrier separation and boost photocatalytic efficiency.

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Chemistry in a confined space: characterization of nitrogen-doped titanium oxide nanotubes produced by calcining ammonium trititanate nanotubes

Cited by 28 publications

References 41 publications

Novel Titania Nanocoatings Produced by Anodic Oxidation with the Use of Cyclically Changing Potential: Their Photocatalytic Activity and Biocompatibility

Novel Titania Nanocoatings Produced by Anodic Oxidation with the Use of Cyclically Changing Potential: Their Photocatalytic Activity and Biocompatibility

Origin of the visible light absorption of Co²⁺ and NH₄⁺ co‐doped hydrogen titanate nanotube thin films

Enhanced Photocatalytic Activity of Heterostructured Ferroelectric BaTiO₃/α-Fe₂O₃ and the Significance of Interface Morphology Control

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Chemistry in a confined space: characterization of nitrogen-doped titanium oxide nanotubes produced by calcining ammonium trititanate nanotubes

Cited by 28 publications

References 41 publications

Novel Titania Nanocoatings Produced by Anodic Oxidation with the Use of Cyclically Changing Potential: Their Photocatalytic Activity and Biocompatibility

Novel Titania Nanocoatings Produced by Anodic Oxidation with the Use of Cyclically Changing Potential: Their Photocatalytic Activity and Biocompatibility

Origin of the visible light absorption of Co2+ and NH4+ co‐doped hydrogen titanate nanotube thin films

Enhanced Photocatalytic Activity of Heterostructured Ferroelectric BaTiO3/α-Fe2O3 and the Significance of Interface Morphology Control

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Origin of the visible light absorption of Co²⁺ and NH₄⁺ co‐doped hydrogen titanate nanotube thin films

Enhanced Photocatalytic Activity of Heterostructured Ferroelectric BaTiO₃/α-Fe₂O₃ and the Significance of Interface Morphology Control