scholarly journals Transparent Photocatalytic Thin Films on Flexible Polymer Substrates

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1945 ◽  
Author(s):  
Nives Vodišek ◽  
Andraž Šuligoj ◽  
Dorota Korte ◽  
Urška Lavrenčič Štangar
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Vinylidene Fluoride ◽  
Mechanical Stability ◽  
Light Exposure ◽  
Beam Deflection ◽  
Polymer Substrates ◽  
Flexible Polymer ◽  
Self Cleaning ◽  
Photocatalytic Films

Self-cleaning and/or photocatalytic films on polymer substrates have found numerous applications during the past decades. However, the common demand for high-temperature post synthesis treatment limits the application to temperature resistant substrates only. Herein, we prepared self-cleaning photocatalytic films on four thermosensitive polymeric substrates: polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), and acryl coated polyester (PES) fabric (D2) with poly(vinylidene fluoride) (PVDF) containing lacquer (D1). TiO2 was prepared via a low-temperature sol-gel process using titanium(IV) isopropoxide and zirconium(IV) butoxide as precursors with various loading levels of Zr; 0, 5, 10, and 20 mol.%, and deposited on the substrates by using a SiO2 binder in form of thin films (ca. 200 nm thick) via dip-coating. The films were characterized by SEM, hardness test, UV-Vis, photothermal beam deflection spectroscopy, and IR spectroscopy, while photocatalytic activity was measured by the fluorescence-based method of the terephthalic acid probe and wetting by contact angle measurements. Films containing 10 mol.% of Zr showed the best compromise regarding photocatalytic activity and mechanical stability while from substrates point of view PVC performed the best, followed by PMMA, D1, and D2. The beneficial role of SiO2 binder was not only guaranteeing excellent mechanical stability, but also to prevent the D1 polymer from deterioration; the latter was found to be labile to long-term solar-light exposure due to degradation of the top PVDF layer.

Magnetite thin films grown on different flexible polymer substrates at room temperature: Role of antiphase boundaries in electrical and magnetic properties

2020 ◽  
Vol 846 ◽  
pp. 156368
Author(s):  
Mohammad Shahnawaze Ansari ◽  
Mohd Hafiz Dzarfan Othman ◽  
Mohammad Omaish Ansari ◽  
Sana Ansari ◽  
Huda Abdullah ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Room Temperature ◽  
Antiphase Boundaries ◽  
Polymer Substrates ◽  
Electrical And Magnetic Properties ◽  
Flexible Polymer

Effect of SnO2 Addition into TiO2 Thin Films on Photocatalytic Activity and Hydrophilic Property

2014 ◽  
Vol 979 ◽  
pp. 90-93 ◽  
Author(s):  
Weerachai Sangchay ◽  
Tanarat Rattanakool
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Sol Gel ◽  
Dip Coating ◽  
Photocatalytic Activities ◽  
Self Cleaning ◽  
Xrd Techniques ◽  
Dip Coating Technique

The pure TiO2and SnO2-TiO2thin films on glass substrate were fabricated using a sol-gel dip coating technique. The thin films were annealed at the temperature of 700 °C for 2 h with the heating rate of 10 °C/min. The microstructures of the fabricated thin films were characterized by SEM and XRD techniques. The photocatalytic activities of the thin films were also tested by the degradation of methylene blue (MB) solution under UV irradiation. Finally, hydrophilic or self-cleaning properties of thin films were evaluated by measuring the contact angle of water droplet on the thin films with and without UV irradiation. It was found that 1 %mol SnO2-TiO2thin films shows the highest of photocatalytic activity and provide the most self-cleaning properties.

scholarly journals Transparent anti-fogging and self-cleaning TiO2/SiO2 thin films on polymer substrates using atmospheric plasma

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Jean-Baptiste Chemin ◽  
Simon Bulou ◽  
Kamal Baba ◽  
Charly Fontaine ◽  
Thierry Sindzingre ◽  
...  
Keyword(s):  
Thin Films ◽  
Atmospheric Plasma ◽  
Polymer Substrates ◽  
Self Cleaning

Self-Cleaning Characteristics of Mesoporous Nano-Crystalline TiO2-SiO2 Thin Films

2018 ◽  
Author(s):  
Chen Chen ◽  
Xinguo Ma ◽  
Shijie Dong ◽  
Xiaobo Chen ◽  
Chuyun Huang
Keyword(s):  
Contact Angle ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Surface Morphology ◽  
Ultraviolet Light ◽  
Mechanical Stability ◽  
Volume Fraction ◽  
Hydroxyl Groups ◽  
Self Cleaning ◽  
Short Time

Since titanium dioxide was found to exhibit super-hydrophilicity under ultraviolet light, researches on titanium dioxide self-cleaning films have also been continuing. It has been proved that mesoporous structure of the film can improve its optical transmittance, reduce the light reflection, and improve the utilization of light, thus enhancing its photocatalytic activity. The doping of SiO2 in TiO2 can increase the number of hydroxyl groups on the surface of the film, inhibit the transformation of TiO2 crystals and increase the specific surface area, thus improving its photocatalytic activity and reduce the contact angle of water droplets, and eventually enhancing the self-cleaning effect of the film. In this paper, the effects of different volume fractions of SiO2 on the surface morphology, mechanical stability, wettability and photocatalytic activity of TiO2 films are explored in great detail. It has been found that the film shows a smooth, crack-free surface morphology at a volume fraction of 20% SiO2. After exposure to ultraviolet light, a contact angle of 0.75° can be obtained in a short time, and the film exhibits super-hydrophilicity. Moreover, a low contact angle is maintained for a long time after the lighting is stopped. Methyl orange is adopted to evaluate its photocatalytic performance. Under ultraviolet light, it can be almost completely degraded in a short time, showing great photocatalytic activity. All the mesoporous films prepared exhibit good optical permeability. At the same time, it has been found that the films prepared are of good adhesion and maintain acid and alkaline resistance under natural conditions.

scholarly journals Thickness Effect on Photocatalytic Activity of TiO2 Thin Films Fabricated by Ultrasonic Spray Pyrolysis

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1058
Author(s):  
Ibrahim Dundar ◽  
Arvo Mere ◽  
Valdek Mikli ◽  
Malle Krunks ◽  
Ilona Oja Acik
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Film Thickness ◽  
Stearic Acid ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Tio2 Films ◽  
Tio2 Thin Films ◽  
Ultrasonic Spray ◽  
Self Cleaning

In this study, TiO2 thin films were deposited by ultrasonic spray pyrolysis from solutions with concentrations of 0.1 and 0.2 M. The deposition temperature was adjusted at 350 °C and all samples were annealed at 500 °C for 1 h in air. The thickness of TiO2 films was changed in the range of 50 to ca. 800 nm by varying the number of spray cycles from 1 to 21 and the solution concentration. The results showed that the mean crystallite size of the anatase structure, the surface roughness, and light absorption increased with the film thickness. The effect of film thickness on the photocatalytic activity was investigated with the photodegradation of stearic acid under UV-A irradiation. The optimal thickness of TiO2 films fabricated by ultrasonic spray pyrolysis for photocatalytic self-cleaning applications was in the range of 170–230 nm, indicating a ca. 2.6 times-higher photocatalytic self-cleaning activity compared to the reference sample, Pilkington ActivTM. The photocatalytic results showed that the 190 nm-thick TiO2 film deposited from the 0.1 M solution applying seven spray cycles exhibited the finest grain structure and maximum photocatalytic activity, leading to 94% of stearic acid degradation in 180 min under UV-A light with the reaction rate constant k = 0.01648 min−1.

The enhanced photocatalytic activity and self-cleaning properties of mesoporous SiO2 coated Cu-Bi2O3 thin films

2015 ◽  
Vol 44 (16) ◽  
pp. 7428-7436 ◽  
Author(s):  
Wenjie Shan ◽  
Yun Hu ◽  
Mengmeng Zheng ◽  
Chaohai Wei
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Mesoporous Sio2 ◽  
Self Cleaning

Mesoporous SiO2 coated Cu-Bi2O3 thin films were synthesized and they exhibited enhanced photocatalytic activity and self-cleaning properties compared to pure Bi2O3 films.

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