Titania Nanotubes Prepared by Chemical Processing

Kasuga, T.; Hiramatsu, M.; Hoson, A.; Sekino, Tohru; Niihara, K.

doi:10.1002/(sici)1521-4095(199910)11:15<1307::aid-adma1307>3.3.co;2-8

Cited by 394 publications

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“…Classic oxide nanotubes are grown by hydrothermal or template methods that lead to a nanotube or nanowire “powder” 20–23. However, several advanced morphologies can directly be grown aligned on a conductive substrate such as wires,24 templated rods,25–29 or self‐organized anodic structures30–35 (see for example Figure a,b) that can be obtained as an oxide layer firmly attached to the Ti‐(metal) substrate.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…First, the composition of the HT derived titanate remains ambiguous. Several different crystal structures and compositions have been proposed to describe this titanate product, such as TiO 2 anatase, bititanate [Na x Ti 2− x O 4 (OH) or Na x H 2− x Ti 2 O 5 (H 2 O)], lepidocrocite titanates (H x Ti 2− x /4 □ x /4 O 4 ), □ represents vacancies, trititanates (Na x H 2− x Ti 3 O 7 ), and tetratitanate (H 2 Ti 4 O 9 ·H 2 O) . Due to the various preparation conditions mentioned in the literatures, the reaction temperature, duration, and post treatments may all result in different compositions of the HT derived titanate.…”

Section: Introductionmentioning

confidence: 99%

Morphology, Chemical Composition and Phase Transformation of Hydrothermal Derived Sodium Titanate

Zuo

2012

J. Am. Ceram. Soc.

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This study intends to clarify the discrepancies on the effect of precursor size, chemical composition, and thermal behavior of Na-titanate obtained through a conventional hydrothermal reaction of anatase in a highly concentrated aqueous NaOH solution. According to experimental results, as well as that presented in related literatures, ultrafine anatase precursor favors nanofiber formation, whereas larger-particle anatase precursor forms nanotubes. The formation mechanism, in correlation with the precursor size and the resulting morphology of the obtained titanate product, is described in detail. According to X-ray Diffraction and Raman analyses, the as-formed Na-titanate is considered a quasi-disordered structure that allows the occupation of a wide range of Na into the titanate structure. An increased Na/Ti ratio is observed with increased temperature, which simultaneously results in a distortion of the titanate structure. Moreover, the as-synthesized Na-titanate is thermally unstable and tends to degrade into amorphous clusters after heat treatment at 300°C. Rod-like Na 2 Ti 6 O 13 is recrystallized from the amorphous cluster at 700°C-800°C and becomes plate-like after annealing at 900°C via a parallel assembly of Na 2 Ti 6 O 13 rods. An additional Na 2 Ti 3 O 7 phase appears at high temperatures, exhibiting a relatively higher Na/Ti ratio. R. Riman-contributing editorManuscript No. 30352.

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“…The formation of TiO 2 fibers was due to the aging of TiO 2 powder in 20% NaOH at 60°C. The TiO 2 powders reacted with the NaOH can form Ti–O–Na bonds and ion exchange of Na + by H + takes place during the washing treatment with diluted HCl and DI water, which results in the formation of fibrous structure of TiO 2 15,16 Figure 3(d). taken from the Q region in (c), shows porous intertextural TiO 2 fibers having meshy holes of about 200–400 nm in diameter on the surface of the continuous pore surface of the TiO 2 /Al 2 O 3 composite membrane.…”

Section: Resultsmentioning

confidence: 99%

“…The binding energy of the Ti 2 p doublet (Ti 2 p 3/2 , 2 p 1/2 ) was unchanged and its shape was symmetrical for both TiO 2 powder and fibers, which indicated a single chemical state in a chemical environment of the Ti–O–Ti bond type. The position of the Ti 2 p 3/2 components at 458.8 eV describes Ti 4+ valence as the dominant surface state 16,18 Figure 6(b). shows the O 1 s peak positions of the TiO 2 powder and fibers locating at 530.5 and 532.5 eV, corresponded to (Ti 4+ –O) and (OH−), respectively.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Microstructure Characterization of Continuous Porous TiO₂/Al₂O₃ Composite Membrane

Lee

Paul

Hong

et al. 2009

Journal of the American Ceramic Society

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Using a multipass extrusion process, continuous porous Al 2 O 3 body (B41% porosity) was produced and used as a substrate to fabricate continuous porous TiO 2 /Al 2 O 3 composite membrane. The diameter of the continuous pores of the porous Al 2 O 3 body was about 150 lm. The TiO 2 nanopowders dip coated on the continuous pore-surface Al 2 O 3 body existed as rutile and anatase phases after calcination at 5201C in air. However, after aging of the fabricated continuous porous TiO 2 /Al 2 O 3 composite membrane in 20% NaOH at 601C for 24 h, a large number of TiO 2 fibers frequently observed on the pore surface. The diameter of the TiO 2 fibers was about 150 nm having a high specific surface area. However, after 48-h aging period, the diameter of the TiO 2 fibers increased, which was about 3 lm. Most of the TiO 2 fibers had polycrystalline structure having nanosized rutile and anatase crystals of about 20 nm.

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Titania Nanotubes Prepared by Chemical Processing

Cited by 394 publications

References 0 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

Morphology, Chemical Composition and Phase Transformation of Hydrothermal Derived Sodium Titanate

Fabrication and Microstructure Characterization of Continuous Porous TiO₂/Al₂O₃ Composite Membrane

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Titania Nanotubes Prepared by Chemical Processing

Cited by 394 publications

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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

Morphology, Chemical Composition and Phase Transformation of Hydrothermal Derived Sodium Titanate

Fabrication and Microstructure Characterization of Continuous Porous TiO2/Al2O3 Composite Membrane

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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 and Microstructure Characterization of Continuous Porous TiO₂/Al₂O₃ Composite Membrane