Nitrogen-doped TiO2 mesosponge layers formed by anodization of nitrogen-containing Ti alloys

Kim, Doohun; Tsuchiya, Hiroaki; Fujimoto, Shinji; Schmidt-Stein, Felix; Schmuki, Patrik

doi:10.1007/s10008-010-1282-7

Cited by 17 publications

(13 citation statements)

References 28 publications

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“…Most unique to anodic TiO 2 nanostructures (nanotubes and TMS) is that they can be simply doped by anodization of a homogeneous alloy of titanium with the dopant. Using this method, N‐doped TiO 2 nanotubes can be obtained by anodizing TiN alloyed Ti substrates,312, 313 where the substrate is e.g. prepared by arc‐melting of pure Ti and TiN powders.…”

Section: Modification Of Tio2 and Tio2 Nanotube Propertiesmentioning

confidence: 99%

A Review of Photocatalysis using Self‐organized TiO₂ Nanotubes and Other Ordered Oxide Nanostructures

Paramasivam

Jha

Liu

et al. 2012

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Photocatalytic approaches, that is the reaction of light-produced charge carriers at a semiconductor surface with their environment, currently attract an extremely wide scientific interest. This is to a large extent due to the high expectations: i) to convert sunlight directly into an energy carrier (H(2)), ii) to stimulate chemical synthetic reactions, or iii) to degrade unwanted environmental pollutants. Since the early reports in 1972, TiO(2) has been the most investigated photocatalytic material by far; this originates from its outstanding electronic properties that allow for a wide range of applications. Not only the material, but also its structure and morphology, can have a considerable influence on the photocatalytic performance of TiO(2). In recent years, particularly 1D (or pseudo 1D) structures such as nanowires and nanotubes have received great attention. The present Review focuses on TiO(2) nanotube arrays (and similar structures) that grow by self-organizing electrochemistry (highly aligned) from a Ti metal substrate. Herein, the growth, properties, and applications of these tubes are discussed, as well as ways and means to modify critical tube properties. Common strategies are addressed to improve the performance of photocatalysts such as doping or band-gap engineering, co-catalyst decoration, junction formation, or applying external bias. Finally, some unique applications of the ordered tube structures in various photocatalytic approaches are outlined.

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Section: Modification Of Tio2 and Tio2 Nanotube Propertiesmentioning

confidence: 99%

A Review of Photocatalysis using Self‐organized TiO₂ Nanotubes and Other Ordered Oxide Nanostructures

Paramasivam

Jha

Liu

et al. 2012

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643

496

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“…The results indicated that the visible light absorption and photoelectrochemical activities of these doped crystallized TNAs were not only influenced by the energy gaps and the distributions of impurity states but were also affected by the locations of Femi levels and the energies of band gap edges [50,51]. Among all these anions, the doping of TNAs with nitrogen or carbon has been found to receive significant attention [52][53][54][55][56][57][58][59]. Highly promising N-doping approach for TNAs includes one-step direct electrochemical anodization of a TiN alloy or growing TNAs in a solution containing doping species [59].…”

Section: Modification Of Tnamentioning

confidence: 99%

Fabrication, Modification, and Emerging Applications of TiO₂Nanotube Arrays by Electrochemical Synthesis: A Review

Huang

Zhang

Lai

2013

International Journal of Photoenergy

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Titania nanotube arrays (TNAs) as a hot nanomaterial have a unique highly ordered array structure and good mechanical and chemical stability, as well as excellent anticorrosion, biocompatible, and photocatalytic performance. It has been fabricated by a facile electrochemical anodization in electrolytes containing small amounts of fluoric ions. In combination with our research work, we review the recent progress of the new research achievements of TNAs on the preparation processes, forming mechanism, and modification. In addition, we will review the potential and significant applications in the photocatalytic degradation of pollutants, solar cells, water splitting, and other aspects. Finally, the existing problems and further prospects of this renascent and rapidly developing field are also briefly addressed and discussed.

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“…Compared to other nanostructures, TiO 2 nanotube arrays (TNAs) are of interest because they can provide a large surface-to-volume ratio and unidirectional electrical channel [30,31]. Several approaches to incorporate nitrogen into TNAs include one-step direct electrochemical anodization of a TiN alloy [32,33], anodization in the nitrogen-containing electrolyte [34], immersing TNAs in a N-containing solution, and performing post-annealing treatment [4,30,35]. It was found that N-doping was successfully achieved by thermal annealing of the as-prepared anodic TNAs in pure NH 3 gas [36].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Performance of Nitrogen-Doped TiO2 Nanotube Arrays Using a Simple Annealing Process

Hiếu

Lam

et al. 2018

Micromachines

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Nitrogen-doped TiO2 nanotube arrays (N-TNAs) were successfully fabricated by a simple thermal annealing process in ambient N2 gas at 450 °C for 3 h. TNAs with modified morphologies were prepared by a two-step anodization using an aqueous NH4F/ethylene glycol solution. The N-doping concentration (0–9.47 at %) can be varied by controlling N2 gas flow rates between 0 and 500 cc/min during the annealing process. Photocatalytic performance of as-prepared TNAs and N-TNAs was studied by monitoring the methylene blue degradation under visible light (λ ≥ 400 nm) illumination at 120 mW·cm−2. N-TNAs exhibited appreciably enhanced photocatalytic activity as compared to TNAs. The reaction rate constant for N-TNAs (9.47 at % N) reached 0.26 h−1, which was a 125% improvement over that of TNAs (0.115 h−1). The significant enhanced photocatalytic activity of N-TNAs over TNAs is attributed to the synergistic effects of (1) a reduced band gap associated with the introduction of N-doping states to serve as carrier reservoir, and (2) a reduced electron‒hole recombination rate.

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Nitrogen-doped TiO2 mesosponge layers formed by anodization of nitrogen-containing Ti alloys

Cited by 17 publications

References 28 publications

A Review of Photocatalysis using Self‐organized TiO₂ Nanotubes and Other Ordered Oxide Nanostructures

A Review of Photocatalysis using Self‐organized TiO₂ Nanotubes and Other Ordered Oxide Nanostructures

Fabrication, Modification, and Emerging Applications of TiO₂Nanotube Arrays by Electrochemical Synthesis: A Review

Enhanced Photocatalytic Performance of Nitrogen-Doped TiO2 Nanotube Arrays Using a Simple Annealing Process

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Nitrogen-doped TiO2 mesosponge layers formed by anodization of nitrogen-containing Ti alloys

Cited by 17 publications

References 28 publications

A Review of Photocatalysis using Self‐organized TiO2 Nanotubes and Other Ordered Oxide Nanostructures

A Review of Photocatalysis using Self‐organized TiO2 Nanotubes and Other Ordered Oxide Nanostructures

Fabrication, Modification, and Emerging Applications of TiO2Nanotube Arrays by Electrochemical Synthesis: A Review

Enhanced Photocatalytic Performance of Nitrogen-Doped TiO2 Nanotube Arrays Using a Simple Annealing Process

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A Review of Photocatalysis using Self‐organized TiO₂ Nanotubes and Other Ordered Oxide Nanostructures

A Review of Photocatalysis using Self‐organized TiO₂ Nanotubes and Other Ordered Oxide Nanostructures

Fabrication, Modification, and Emerging Applications of TiO₂Nanotube Arrays by Electrochemical Synthesis: A Review