Effect of heat treatment on the crystal phase composition, semiconducting properties and photoelectrocatalytic color removal efficiency of TiO2 nanotubes arrays

Acevedo–Peña, Próspero; Carrera-Crespo, J. Edgar; González, F.; González, Ignacio

doi:10.1016/j.electacta.2014.06.056

Cited by 62 publications

(42 citation statements)

References 33 publications

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“…1,3 For this purpose the space charge capacitance was evaluated from EIS spectra obtained at different potentials in which no faradaic processes are taking place over the TiO 2 surface in a 0.1 M HClO 4 aqueous electrolyte. 1,3,8 The flat band potential, E fb , and the donor density, N d , are tabulated in the Table 2. Increasing the formation voltage of the films caused a slight displacement of N d toward higher values, and changes the E fb to continuously less positive values.…”

Section: Resultsmentioning

confidence: 99%

“…10,11,14 Additionally, according to previous studies, doping TiO 2 with these elements leads to a shift of E fb towards more distant values from the TiO 2 conduction band, 12,13 disagreeing with the trend observed in Table 2. However, it is worth mentioning that the measurement of semiconductor properties using EIS is limited to compact oxide film, 1,3 so in order to obtain information about the flat band potential of the nanotube film, open circuit potential measurements were performed under illumination (OCP on ), see Figure 2a.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the films were thoroughly cleaned with ethanol and Millipore water (18.2 M cm), left to air dry, and heat treated in ambient air at 450 °C (10 °Cmin -1 ) for 30 min to obtain anatase polymorph. 1,3 SEM images were acquired using a JSM 7600F high field emission microscope, with an accelerating voltage of 10.0 kV. Morphological characteristics of the formed films were estimated using the iTEM software from Olympus soft imaging solutions.…”

Section: Methodsmentioning

confidence: 99%

“…3,[6][7][8][9] TiO 2 nanotubes can be obtained by anodization in aqueous electrolytes as well as in organic media containing fluoride ions. [1][2][3][4][5][6][7][8][9] The latter one is the most commonly used to fabricate films for photoelectrochemical applications due to its simplicity for controlling the morphology (tube diameter and length) through operational variables. To design these structures and provide more efficient anodes, it is necessary to understand different parameters that govern the photoelectrochemical performance of TiO 2 nanotube films.…”

Section: Introductionmentioning

confidence: 99%

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Relation between Morphology and Photoelectrochemical Performance of TiO2 Nanotubes Arrays Grown in Ethylene Glycol/Water

Acevedo–Peña

González

2014

Procedia Chemistry

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The TiO 2 nanotube films were prepared by anodizing Ti plates in 0.2 M NH 4 F ethylene glycol/10% H 2 O under different formation voltages keeping fixed the time length, or by keeping fixed the formation voltage and varying the time length. The morphology of the TiO 2 film obtained was observed by SEM images and different morphological parameters were derived from them. Furthermore, the optical and semiconducting properties of TiO 2 films were also measured. The photoelectrochemical performance toward water oxidation of the TiO 2 only showed to be dependent with the inner diameter of the nanotubes, that could be related to the interaction of the film with the light and the transport of species in the electrolyte inward or outward the film.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Relation between Morphology and Photoelectrochemical Performance of TiO2 Nanotubes Arrays Grown in Ethylene Glycol/Water

Acevedo–Peña

González

2014

Procedia Chemistry

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“…Another disadvantage caused by the substrate effect is the phase instability of NTs under high-temperature treatment. TiO2 NTs with a stable anatase phase have excellent performance in photocatalytic and photoelectrochemical reactions [17,[19][20][21]. However, after annealing of the as-formed NTs on their metallic substrate above approximately 550°C, a crystal phase transformation from anatase to rutile developed [15,22], which would play a role in lowering the photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Anatase TiO2 nanotube powder film with high crystallinity for enhanced photocatalytic performance

Lin¹,

Liu²,

Zhu³

et al. 2016

Nano Online

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Cite as: Jia Lin, Xiaolin Liu, Shu Zhu, Yongsheng Liu. Anatase TiO2 nanotube powder film with high crystallinity for enhanced photocatalytic performance , nano Online We report on the synthesis of TiO2 nanotube (NT) powders using anodic oxidation and ultrasonication. Compared to free-standing NT array films, the powder-type NTs can be easily fabricated in a cost-effective way. Particularly, without the substrate effect arising from underlying Ti metals, highly crystallized NT powders with intact tube structures and pure anatase phase can be obtained using high-temperature heat treatment. The application of NTs with different crystallinity for the photocatalytic decomposition of methylene blue (MB) was then demonstrated. The results showed that with increasing annealing temperature, the photocatalytic decomposition rate was gradually enhanced, and the NT powder electrode annealed at 650°C showed the highest photoactivity. Compared to typical NTs annealed at 450°C, the rate constant increased by 2.7-fold, although the surface area was 21% lower. These findings indicate that the better photocatalytic activity was due to the significantly improved crystallinity of anatase anodic NTs in powder form, resulting in a low density of crystalline defects. This simple and efficient approach is applicable for scaled-up water purification and other light utilization applications.

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Effect of surface characteristics on the antibacterial properties of titanium dioxide nanotubes produced in aqueous electrolytes with carboxymethyl cellulose

Ocampo

Echeverry‐Rendón

DeAlba-Montero

et al. 2020

J Biomedical Materials Res

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Nanotubular structures were produced on a commercially pure titanium surface by anodization in an aqueous electrolyte that contained carboxymethyl cellulose and sodium fluoride. The internal diameters obtained were about 100, 48, and 9.5 nm, respectively. Several heat treatments at 200, 350, and 600 C were made to produce nanotubes with different titanium dioxide polymorphs (anatase, rutile). All tested surfaces were superhydrophilic, this behavior was maintained after at least 30 days, regardless of the heat treatment. Although in previous works the nanotube features effect on the bacteria behavior had been studied; this item still unclear. For the best of our knowledge, the effect of small internal diameters (about 10 nm) with and without heat treatment and with and without ultraviolet (UV) irradiation on the bacteria strains comportment has not been reported. From our results, both the internal diameter and the postanodized treatments have an effect on the bacteria strains comportment. All nanotubular coatings UV treated and heat treated at 350 and 600 C; despite they have different inner diameters, inhibit the bacteria growth of both Staphylococcus aureus and Pseudomonas aeruginosa strains. The nanotubular coatings obtained at 20 V and heat treated at 350 C produced the lower bacteria adhesion against both strains evaluated.

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Effect of heat treatment on the crystal phase composition, semiconducting properties and photoelectrocatalytic color removal efficiency of TiO2 nanotubes arrays

Cited by 62 publications

References 33 publications

Relation between Morphology and Photoelectrochemical Performance of TiO2 Nanotubes Arrays Grown in Ethylene Glycol/Water

Relation between Morphology and Photoelectrochemical Performance of TiO2 Nanotubes Arrays Grown in Ethylene Glycol/Water

Anatase TiO2 nanotube powder film with high crystallinity for enhanced photocatalytic performance

Effect of surface characteristics on the antibacterial properties of titanium dioxide nanotubes produced in aqueous electrolytes with carboxymethyl cellulose

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