Effect of acid solution, fluoride ions, anodic potential and time on the microstructure and electronic properties of self-ordered TiO 2 nanotube arrays

Li, D.G.; Chen, D.R.; Wang, J.D.; Liang, Peng

doi:10.1016/j.electacta.2016.04.002

Cited by 30 publications

(24 citation statements)

References 50 publications

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“…These findings were confirmed by the presence of sharp and intense peaks at a relatively long anodic oxidation duration. It is noteworthy that the growth of TiO 2 nanotubes when increasing the anodizing time is in good agreement with Li et al [19]. A possible explanation for the growth of TiO 2 nanotubes with the increase in anodizing time is that the anodization duration played a role in influencing the phase transformation of the crystal growth.…”

Section: Resultssupporting

confidence: 88%

“…These observations give us a hint that a compact oxide layer with a porous structure does not form at this stage. According to Li et al [19], no nanotubes could be formed within a relatively short period during the anodizing process since the Ti just starts to be oxidized to Ti 4+ ions at the surface layer of the Ti foil. During this stage Ti 4+ ions increased and the surface layer of Ti foil was removed.…”

Section: Resultsmentioning

confidence: 99%

“…Based on their findings, TiO 2 nanotubes can only be observed after 10 min of exposure time. The resulting TiO 2 nanotubes were found to be debris-free due to the relatively high number of ejected Ti 4+ ions during the chemical dissolution of the electrolyte over a relatively long anodizing time [19]. Figure 2b shows that a dense, aligned, compact and smooth wall of nanotubes could be obtained after 10 min anodic oxidation.…”

Section: Resultsmentioning

confidence: 99%

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Impact of TiO2 Nanotubes’ Morphology on the Photocatalytic Degradation of Simazine Pollutant

et al. 2018

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There are various approaches to enhancing the catalytic properties of TiO2, including modifying its morphology by altering the surface reactivity and surface area of the catalyst. In this study, the primary aim is to enhance the photocatalytic activity by changing the TiO2 nanotubes’ architecture. The highly ordered infrastructure is favorable for a better charge carrier transfer. It is well known that anodization affects TiO2 nanotubes’ structure by increasing the anodization duration which in turn influence the photocatalytic activity. The characterizations were conducted by FE-SEM (fiend emission scanning electron microscopy), XRD (X-ray diffraction), RAMAN (Raman spectroscopy), EDX (Energy dispersive X-ray spectroscopy), UV-Vis (Ultraviolet visible spectroscopy) and LCMS/MS/MS (liquid chromatography mass spectroscopy). We found that the morphological structure is affected by the anodization duration according to FE-SEM. The photocatalytic degradation shows a photodegradation rate of k = 0.0104 min−1. It is also found that a mineralization of Simazine by our prepared TiO2 nanotubes leads to the formation of cyanuric acid. We propose three Simazine photodegradation pathways with several intermediates identified.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Impact of TiO2 Nanotubes’ Morphology on the Photocatalytic Degradation of Simazine Pollutant

et al. 2018

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“…The recombination of photogenerated electrons and holes in the dark results in a low photo-quantum efficiency of TiO 2 . To overcome these defects, TiO 2 nanotube arrays with large specific surface areas were synthesized [14–16] and various strategies were developed to expand its absorption to the visible light range. These strategies include coupling with narrow-bandgap semiconductors (ZnSe, WO 3 , SnO 2 , CdS, and Ag 2 S) [17–21], metals (Ag, Au, Cu, and Bi) [22–24], and nonmetals (N, F, and graphene) [25–27].…”

Section: Introductionmentioning

confidence: 99%

Photocathodic Protection of 304 Stainless Steel by Bi2S3/TiO2 Nanotube Films Under Visible Light

Wang

Wei

et al. 2017

Nanoscale Res Lett

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We report the preparation of TiO2 nanotubes coupled with a narrow bandgap semiconductor, i.e., Bi2S3, to improve the photocathodic protection property of TiO2 for metals under visible light. Bi2S3/TiO2 nanotube films were successfully synthesized using the successive ionic layer adsorption and reaction (SILAR) method. The morphology and structure of the composite films were studied by scanning electron microscopy and X-ray diffraction, respectively. UV–visible diffuse reflectance spectra were recorded to analyze the optical absorption property of the composite films. In addition, the influence of Bi2S3 deposition cycles on the photoelectrochemical and photocathodic protection properties of the composite films was also studied. Results revealed that the heterostructure comprised crystalline anatase TiO2 and orthorhombic Bi2S3 and exhibited a high visible light response. The photocurrent density of Bi2S3/TiO2 was significantly higher than that of pure TiO2 under visible light. The sensitization of Bi2S3 enhanced the separation efficiency of the photogenerated charges and photocathodic protection properties of TiO2. The Bi2S3/TiO2 nanotubes prepared by SILAR deposition with 20 cycles exhibited the optimal photogenerated cathodic protection performance on the 304 stainless steel under visible light.

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“…This method also is a simple, effective, low cost especially with great ability of controlling growth parameters (potential, PH, the chemistry of electrolyte solution and time) [10,25,26]. The chemical and physical properties of the anodic TiO 2 nanotubes are dependent on their growth conditions [27], so by changing growth parameters like anodization time, applied potential and electrolyte composition, morphological structure of the anodic TiO 2 nanotubes can be modified [28] and optimum anodic TiO 2 nanotubes can be obtained. For example, among the growth parameters, anodization potential is the key factor controlling the diameter of the nanotubes [29].…”

Section: Introductionmentioning

confidence: 99%

Enhanced physical properties of the anodic TiO2 nanotubes via proper anodization time

2018

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Vertically aligned titanium dioxide (TiO 2 ) nanotubes were synthesized by electrochemical anodic oxidation in an electrolyte solution containing 0.45 wt% ammonium fluoride (NH 4 F) and 2 vol% deionized water at constant potential (70 V) for various anodization time at the room temperature. The influence of the anodization time on the morphology and optical properties of the anodic TiO 2 nanotubes have been studied. Field emission scanning electron microscopy results revealed that the anodic TiO 2 nanotube morphology extremely depends on the anodization time. It was observed that by increasing anodization time, length of the anodic TiO 2 nanotubes increased and nanotubes destroyed at the top of the tubes. After a long time of anodization process (9 h), nanotubes completely destroyed. Photoluminescence measurements showed that the anodic TiO 2 nanotube band gap energy depends on the anodic TiO 2 nanotube morphology. The anodic TiO 2 nanotubes without any damage had a minimum band gap energy (2.9 eV).

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Effect of acid solution, fluoride ions, anodic potential and time on the microstructure and electronic properties of self-ordered TiO 2 nanotube arrays

Cited by 30 publications

References 50 publications

Impact of TiO2 Nanotubes’ Morphology on the Photocatalytic Degradation of Simazine Pollutant

Impact of TiO2 Nanotubes’ Morphology on the Photocatalytic Degradation of Simazine Pollutant

Photocathodic Protection of 304 Stainless Steel by Bi2S3/TiO2 Nanotube Films Under Visible Light

Enhanced physical properties of the anodic TiO2 nanotubes via proper anodization time

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