Thermo-induced hydrophilicity of nano-TiO2 thin films prepared by RF magnetron sputtering

Meng, Fanning; Xiao, Lei; Sun, Zhaoqi

doi:10.1016/j.jallcom.2009.06.107

Cited by 32 publications

(35 citation statements)

References 18 publications

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“…This wetting behavior may be ascribed to the replacement of the chemisorbed hydroxyl groups with the oxygens [25] and the adsorption of organic contaminants on the TN film surface in air ambience [26]. More importantly, the WCA of TN films is larger than the previous results achieved in TiO 2 surface structures [22,25,27]. This behavior may be attributed to the ordered nanotubular structure and the great surface area.…”

Section: Resultsmentioning

confidence: 99%

Effect of annealing temperature on wettability of TiO2 nanotube array films

et al. 2014

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Highly ordered TiO2 nanotube array (TN) films were prepared by anodization of titanium foil in a mixed electrolyte solution of glycerin and NH4F and then annealed at 200°C, 400°C, 600°C, and 800°C, respectively. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), water contact angle (WCA), and photoluminescence (PL). It was found that low temperature (below 600°C) has no significant influence on surface morphology, but the diameter of the nanotube increases from 40 to 50 nm with increasing temperature. At 800°C, the nanotube arrays are completely destroyed and only dense rutile film is observed. Samples unannealed and annealed at 200°C are amorphous. At 400°C, anatase phase appears. At 600°C, rutile phase appears. At 800°C, anatase phase changes into rutile phase completely. The wettability of the TN films shows that the WCAs for all samples freshly annealed at different temperatures are about 0°. After the annealed samples have been stored in air for 1 month, the WCAs increase to 130°, 133°, 135°, 141°, and 77°, respectively. Upon ultraviolet (UV) irradiation, they exhibit a significant transition from hydrophobicity to hydrophilicity. Especially, samples unannealed and annealed at 400°C show high photoinduced hydrophilicity.

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Section: Resultsmentioning

confidence: 99%

Effect of annealing temperature on wettability of TiO2 nanotube array films

et al. 2014

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“…During sputtering, argon gas flow rate was kept at 30 sccm, the chamber pressure was maintained at 0.8 Pa, the sputtering power was 60 W, and the distance between the 0925-8388/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.jallcom.2010.04.067 Geometric pattern for calculation of water contact angle [12].…”

Section: Preparation Of Samplesmentioning

confidence: 99%

“…where Â is water contact angle, L is diameter of the spherical crown, H is height of the spherical crown, as shown [12] in Fig. 1.…”

Section: Hydrophilicity Measurementsmentioning

confidence: 99%

Pure and silver (2.5–40vol%) modified TiO2 thin films deposited by radio frequency magnetron sputtering at room temperature: Surface topography, energy gap and photo-induced hydrophilicity

Meng¹,

Lü²

2010

Journal of Alloys and Compounds

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“…Titanium dioxide is an effective semiconductor and of great research interest for various applications including for photocatalysis [1][2][3], solar cells [1], sensors [4], lithium batteries [5], antimicrobial activity [6], as well as self-cleaning and antifogging [7,8]. In view of its utility as a photocatalyst, TiO 2 usually is processed as thin films or coatings with high specific surface area, since this can enhance exchange with a second phase or the environment.…”

Section: Introductionmentioning

confidence: 99%

Morphology control of TiO2 through hydrothermal synthesis method using protonic tetratitanate

Wang

et al. 2011

Res Chem Intermed

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Fibrous TiO 2 and plate-like TiO 2 were obtained through the hydrothermal synthesis method by using two kinds of protonic tetratitanate (H 2 Ti 4 O 9 ), prepared by ion exchange of K 2 Ti 4 O 9 and HCl, or milled K 2 Ti 4 O 9 and HCl, respectively. The product made by hydrothermal treatment of H 2 Ti 4 O 9 without milling in water consisted of anatase TiO 2 and retained the fibrous morphology of the precursor but with fine crystals attached on the surface, formed by the in situ topotactic transformation reaction and dissolution and recrystallization. On the other hand, TiO 2 prepared with H 2 Ti 4 O 9 obtained through ion exchange of milled K 2 Ti 4 O 9 and HCl had plate-like shape, namely retaining the morphology of nanosheets of H 2 Ti 4 O 9 through an in situ transformation process. Under ultraviolet irradiation, 70% methyl orange degradation by TiO 2 nanosheets was about 3.3 times higher than that by fibrous TiO 2 . The higher surface area, higher pore volume, and smaller particle size led to the higher photocatalytic activity of the TiO 2 nanosheets.

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Thermo-induced hydrophilicity of nano-TiO2 thin films prepared by RF magnetron sputtering

Cited by 32 publications

References 18 publications

Effect of annealing temperature on wettability of TiO2 nanotube array films

Effect of annealing temperature on wettability of TiO2 nanotube array films

Pure and silver (2.5–40vol%) modified TiO2 thin films deposited by radio frequency magnetron sputtering at room temperature: Surface topography, energy gap and photo-induced hydrophilicity

Morphology control of TiO2 through hydrothermal synthesis method using protonic tetratitanate

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