Preparation and Photoelectric Properties of Magnetically Doped TiO2 Nanotube Arrays

The magnetically doped TiO2 nanotube arrays were prepared in 0.25% (mass fraction) NH4F/glycerol including a certain amount of Fe3O4 nanoparticles using the method of anodic oxidation of a pure titanium sheet at a constant potential. The obtained nanotubes film were characterized by Field Emission Scanning Electron Microscope (FESEM), X-ray Diffraction (XRD), Transmission Electron Microscope (TEM) and Photoelectric Performance Test. Neat and orderly TiO2 nanotube arrays with Fe3O4 distuibuted evenly have been synthesized using the electrolyte doping method (add 0.1mol/L of the prepared Fe3O4 in the electrolyte). Photoelectric conversion efficiency of Fe3O4 doped TiO2 nanotubes is higer than that of pure TiO2 nanotubes.

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Zinc-Doped TiO2 Nanotube Arrays

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.434-435.446 ◽

2010 ◽

Vol 434-435 ◽

pp. 446-447 ◽

Cited By ~ 7

Author(s):

Yang Yang ◽

Xiao Hui Wang ◽

Long Tu Li

Keyword(s):

Tio2 Nanotubes ◽

Tio2 Nanotube Arrays ◽

Tio2 Nanotube ◽

Nanotube Arrays ◽

Tio2 Nanotube Array ◽

Tem Analysis ◽

Nanotube Array ◽

Doped Tio2 ◽

Main Technique ◽

Valence Structure

Zinc-doped TiO2 nanotube arrays were fabricated by immersing TiO2 nanotube arrays in zinc-containing solution for hours. And subsequent heat-treatment was crucial for Zn2+ coming into the crystal lattice of TiO2 nanotubes. TEM analysis was used as main technique to investigate the structure of zinc-doped TiO2 nanotubes, and found that the Zn2+ ions only combine into the lattice of TiO2 nanotubes. This kind of doping can change the valence structure in the surface of TiO2 nanotube array. The obtained zinc-doped TiO2 nanotube arrays have potential application in photocatalysis.

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Enhanced Photoelectrochemical Properties from Mo-Doped TiO2 Nanotube Arrays Film

Coatings ◽

10.3390/coatings10010075 ◽

2020 ◽

Vol 10 (1) ◽

pp. 75 ◽

Cited By ~ 2

Author(s):

Danni Xue ◽

Jie Luo ◽

Zhong Li ◽

Yanlin Yin ◽

Jie Shen

Keyword(s):

Magnetron Sputtering ◽

Visible Light ◽

Tio2 Nanotube Arrays ◽

Tio2 Nanotube ◽

Nanotube Arrays ◽

Tio2 Nanotube Array ◽

Photoelectric Conversion ◽

Nanotube Array ◽

Doped Tio2 ◽

Mo Doping

Mo-doped TiO2 nanotube arrays are prepared successfully by a combined method of direct current (DC) magnetron sputtering and anodic oxidation. The doping amount of Mo can be modified by changing the number of molybdenum blocks on the Ti target while a Ti–Mo alloy film is prepared by magnetron sputtering on a metal Ti substrate, following a Mo-doped TiO2 nanotube array grown by anodization. Morphology test shows that the doping of Mo could inhibit the phase transition and growth of crystal of TiO2. X-ray photoelectron spectroscopy (XPS) results show that Mo has successfully been embedded in the TiO2 crystal lattice and mainly exists in the valence states of Mo6+. Mo-doping samples show slightly increased visible light absorption as the red shift of TiO2 absorption edge with the band gap dropping from 3.24 to 3.16 eV with 0.5 at.% Mo doping. The enhanced photocurrent is demonstrated for a 0.5 at.% Mo-doped TiO2 electrode. Through photoelectric performance testing under UV-visible light irradiation, the nanotube array film with a Mo-doped content of 0.5% produced the maximum photocurrent density, which is about four times the undoped TiO2 nanotube array film, exhibiting a considerable photoelectric effect gain. The controllable Mo doping TiO2 nanotube array film prepared by this combining technique is expected as a promising material for efficient applications in photoelectric conversion.

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Highly Ordered TiO2 Nanotube Arrays with Engineered Electrochemical Energy Storage Performances

Materials ◽

10.3390/ma14030510 ◽

2021 ◽

Vol 14 (3) ◽

pp. 510

Author(s):

Wangzhu Cao ◽

Kunfeng Chen ◽

Dongfeng Xue

Keyword(s):

Tio2 Nanotubes ◽

Lithium Ion ◽

Tio2 Nanotube Arrays ◽

Tio2 Nanotube ◽

Electrochemical Anodization ◽

Nanotube Arrays ◽

Free Standing ◽

Structured Materials ◽

Self Organized ◽

Binder Free

Nanoscale engineering of regular structured materials is immensely demanded in various scientific areas. In this work, vertically oriented TiO2 nanotube arrays were grown by self-organizing electrochemical anodization. The effects of different fluoride ion concentrations (0.2 and 0.5 wt% NH4F) and different anodization times (2, 5, 10 and 20 h) on the morphology of nanotubes were systematically studied in an organic electrolyte (glycol). The growth mechanisms of amorphous and anatase TiO2 nanotubes were also studied. Under optimized conditions, we obtained TiO2 nanotubes with tube diameters of 70–160 nm and tube lengths of 6.5–45 μm. Serving as free-standing and binder-free electrodes, the kinetic, capacity, and stability performances of TiO2 nanotubes were tested as lithium-ion battery anodes. This work provides a facile strategy for constructing self-organized materials with optimized functionalities for applications.

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