Preparation and photoelectric effect of Zn2+-TiO2 nanotube arrays

Shi, Dehui; Li, Hong; Dang, Mingming; Lu, Can‐Zhong; Huang, Kelong

doi:10.1016/s1003-6326(10)60648-6

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…The phosphoric acid acts as buffered species controlling sites of acid attack during porous growth and a less acid electrolyte allows nanotubes thicker layer [11,12] Figure 2c that corresponds to potentiostatic anodization at 25 V for 1 hour exhibits collapsed nanostructure with some few porous and an irregular oxide layer. These results show that, there is a limit to applied potential and high potentials leads to collapsed nanostructure, as in this case [13]. Table 1 indicates anodizing parameters and diameters measures of opening top of nanotubes with different anodization condition for each material.…”

Section: Methodsmentioning

confidence: 69%

Growth and electrochemical stability of self-organized TiO2nanotubes on Ti-2 grade and orthopedic Ti6Al4V alloy for biomedical application

et al. 2014

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Titanium and its alloys are biomaterials used in endosseous implants, due to desirable mechanical properties, high corrosion resistance and biocompatibility. Using electrochemical anodization technique these materials can be recovered with self-organized TiO 2 nanotubes layer resulting in increased specific surface area and probable bioactivity improvement. This research aimed determine potentiostatic anodization parameters to obtain self-organized TiO 2 nanotubes layer with reproducibility and ideal diameters for probable bioactive response on Ti -2 grade (ASTM F67) and Ti6Al4V (ASTM F136) orthopedic alloy and evaluation the electrochemical stability behavior in simulated body fluid media. The self-organized nanotubes layer were obtained by potentiostatic electrochemical method in electrolyte containing fluoride ions, H 3 PO 4 /HF for Ti 2 grade and H 3 PO 4 /NH 4 F for Ti6Al4V alloy, the applied potentials were 15 V, 20 V and 25 V for 30, 60 and 90 minutes, for both materials. For morphologic characterization were employed scanning electron microscopy SEM and the Image J software for nanodiameter measurements. The nanoestructure electrochemical stability was evaluated by open circuit potential after immersion for 15, 30 and 60 days in artificial blood plasma, into an electrochemical cell, using SCE (saturated calomel electrode) as reference electrode, in PBS ((phosphate buffered saline) solution electrolyte for 90 minutes. The ideal anodization parameters were 15 V and 20 V for 1 hour and a reproducible, uniform and homogeneous self-organized nanotubes layer were obtained with ideal diameters that probably improve the implant superficial bioactivity with 80 and 120 nm respectively, according to the literature. Open-circuit potentials from metal/oxide system obtained on both materials are stable with potentials in range of -0.031 V to -0,183 V indicating good stability of nanoestructures in simulated body fluid. Nanotubes layer as a superficial treatment is viable with high reproducibility, low cost and electrochemical stability in simulated body fluid media.Keywords: biomaterial, self-organized TiO 2 nanotubes layer, electrochemical behavior Souza, M ; Oliveira, N; Kuromoto, N; Marino, C. revista Matéria, v.19, n.01, pp. 53-60, 2014. 54 INTRODUCTIONThe bioactive response from implant surface and interaction with human body is an important factor in choosing the adequate implant. Titanium and its alloys are successfully used in orthopedic implants, because they have excellent mechanical properties and corrosion resistance. Better implant superficial condition leads to enhance interaction bone/implant and, metal surface coating with self-organized TiO 2 nanotubes layer as superficial modification, increase specific implant superficial area, improving osseointegration; and reducing time to forming neo bone [1]. Several authors describe that nanostructures with diameters between 80 e 100 nm have been showed ideal in the osseointegration process and the nanotubular surfaces improve in approximately 46 t...

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Section: Methodsmentioning

confidence: 69%

Growth and electrochemical stability of self-organized TiO2nanotubes on Ti-2 grade and orthopedic Ti6Al4V alloy for biomedical application

et al. 2014

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“…[4][5][6] In order to improve the photocatalytic efficiency at TiO2 surfaces, a great deal of effort has been devoted [7][8][9] the activity of TiO2 as photocatalyst is well recognized to depend strongly upon the method of preparation. 10) The sol-gel route is well established as an excellent method to prepare the TiO2-based materials, including modification by incorporating foreign ions, 11) TiO2 film by a dip-coating process 12) † and titanium/carbon composites. [13][14][15][16] Provided that CNTs is used as support material and all those advantages of both CNTs and TiO2 are utilized a powerful photocatalyst could be produced.…”

Section: Introductionmentioning

confidence: 99%

Characterization of CNT/TiO₂Electrode Prepared Through Impregnation with TNB and Their Photoelectrocatalytic Properties

Zhang¹,

Chen²,

2009

Environmental Engineering Research

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In this study, we have prepared three kinds of carbon nanometer tube (CNT)/TiO2 electrodes through impregnation with different concentration titanium n-butoxide (TNB) solution. The prepared electrodes were characterized with surface properties, structural crystallinity, elemental identification and photoelectrocatalytic activity. The N2 adsorption data showed that the composites had decreased surface area compared with the pristine CNT. This indicated the blocking of micropores on the surface of CNT, which was further supported by observation via SEM. XRD results showed patterns for the composites and a typical single and clear anatase crystal structure. The main elements such as C, O and Ti were existed for all samples from the EDX data. The catalytic efficiency of the developed electrode was evaluated by the photoelectrodegradation of methylene blue (MB). The positive potential applied in photoelectrocatalytic (PEC) oxidation was studied. It was found that photoelectrocatalytic (PEC) decomposition of MB solution could be attributed to combination effects between TiO2 photocatalytic and CNT electro-assisted. Through the comparison between photocatalytic (PC) oxidation and photoelectrocatalytic (PEC) oxidation, it was found that the PEC oxidation efficiency for MB is higher than that of PC oxidation.

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“…The photoelectrochemical properties of as-prepared samples were characterized by X-ray diffraction (XRD), transmissions electron microscopy (TEM), UV-vis absorbance spectroscopy, photoluminescence spectroscopy (PL), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). Transition metals such as Fe [23] , W [24] , Ag [25] , Pt [26] , Cu [27] and Zn [28] etc. The results show that Cu, Ce and B tri-doped TNTs exhibit the highest photocatalytic activity, which should be ascribed to the synergetic effect of narrowing the band-gap of TiO2, which greatly inhibits the recombination of electrons and holes.…”

mentioning

confidence: 99%

“…Transition metals such as Fe [23] , W [24] , Ag [25] , Pt [26] , Cu [27] and Zn [28] etc. Transition metals and rare earths were the most promising candidates because of the possible transition of d and f orbital electrons, which can effectively reduce the recombination rate of electron-hole pairs and improve photo quantum yield.…”

mentioning

confidence: 99%

Synthesis, characterization and performance of ternary doped Cu–Ce–B/TiO₂ nanotubes on the photocatalytic removal of nitrogen oxides

Chen

2015

New J. Chem.

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A series of single doped, co-doped and tri-doped TiO2 nanotubes with Cu, Ce and B have been successfully prepared by hydrothermal method assisted by cetyl trimethyl ammonium bromide (CTAB). The photoelectrochemical properties of as-prepared samples were characterized by X-ray diffraction (XRD), transmissions electron microscopy (TEM), UV-vis absorbance spectroscopy, photoluminescence spectroscopy (PL), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). The doped TiO2 nanotubes (TNTs) with different amounts of Cu, Ce and B were evaluated by the removal of nitride oxide under the irradiation of UV lamp to optimize the best doping concentration. The results show that Cu, Ce and B tri-doped TNTs exhibit the highest photocatalytic activity, which should be ascribed to the synergetic effect of narrowing the band-gap of TiO2, which greatly inhibits the recombination of electrons and holes.The possible mechanism of photocatalytic reaction was also proposed. 3 recombination of electron/holes pairs. In addition the C-N-codoping can decrease the ban-gap energy and promote the adsoption of visible light. Changlin Yu et al. [21] also reported that the Ag/TiO2-B nanosquares has the high photocatalytic performance which should be attributed to the synergistic effects of B doping that narrows the band gap and the SPR of silver nanoparticles contribute to the highest activity. Furthermore, the single F or Ce-doped TiO2 and the novel porous F, Ce-codoped TiO2 have shown good mesoporous structures and the F, Ce-codoped TiO2 exhibits much higher photocatalytic activity than pure and the single F or Ce-doped TiO2. It was attributed that F doping which could produce more hydroxyl radicals inhibited the recombination of the photoinduced electrons and holes and Ce doping cause the wavelength response range of TiO2 to the long wavelength region. [22] Compared with other nonmetals, the radius of the boron atom is very small and can site at an interstitial position, which replaces an O atom inducing some gap states close to the bottom of the conduction band, and thus leading to its visible light response activity.Furthermore, great efforts have been devoted to prohibit the recombination of the photo-generated electrons and holes pairs. Transition metals and rare earths were the most promising candidates because of the possible transition of d and f orbital electrons, which can effectively reduce the recombination rate of electron-hole pairs and improve photo quantum yield. Transition metals such as Fe [23] , W [24] , Ag [25] , Pt [26] , Cu [27] and Zn [28] etc. were doped, which can introduce new energy levels to narrow its band gap. Out of all transition metals, copper ions as dopant attracted special attention due to copper species including Cu2O and CuO can serve as the trap for charge 5 through a hydrothermal method, which was assisted by CTAB to modify the surface character of TiNTs to form mesopores on the shells [35] . The influence of Cu, Ce and B on the phy...

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Preparation and photoelectric effect of Zn2+-TiO2 nanotube arrays

Cited by 4 publications

References 14 publications

Growth and electrochemical stability of self-organized TiO2nanotubes on Ti-2 grade and orthopedic Ti6Al4V alloy for biomedical application

Growth and electrochemical stability of self-organized TiO2nanotubes on Ti-2 grade and orthopedic Ti6Al4V alloy for biomedical application

Characterization of CNT/TiO₂Electrode Prepared Through Impregnation with TNB and Their Photoelectrocatalytic Properties

Synthesis, characterization and performance of ternary doped Cu–Ce–B/TiO₂ nanotubes on the photocatalytic removal of nitrogen oxides

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Preparation and photoelectric effect of Zn2+-TiO2 nanotube arrays

Cited by 4 publications

References 14 publications

Growth and electrochemical stability of self-organized TiO2nanotubes on Ti-2 grade and orthopedic Ti6Al4V alloy for biomedical application

Growth and electrochemical stability of self-organized TiO2nanotubes on Ti-2 grade and orthopedic Ti6Al4V alloy for biomedical application

Characterization of CNT/TiO2Electrode Prepared Through Impregnation with TNB and Their Photoelectrocatalytic Properties

Synthesis, characterization and performance of ternary doped Cu–Ce–B/TiO2 nanotubes on the photocatalytic removal of nitrogen oxides

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Product

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Characterization of CNT/TiO₂Electrode Prepared Through Impregnation with TNB and Their Photoelectrocatalytic Properties

Synthesis, characterization and performance of ternary doped Cu–Ce–B/TiO₂ nanotubes on the photocatalytic removal of nitrogen oxides