Transparent thin films of Cu–TiO2 with visible light photocatalytic activity

2015 ◽  
Vol 14 (3) ◽  
pp. 591-596 ◽  
Author(s):  
Marcin Janczarek ◽  
Anna Zielińska-Jurek ◽  
Irmina Markowska ◽  
Jan Hupka
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Visible Light ◽  
Low Cost ◽  
Dip Coating ◽  
High Transparency ◽  
Light Activity ◽  
Coating Method ◽  
Dip Coating Method ◽  
Visible Light Photocatalytic

Thin films of Cu–TiO2 with high transparency were prepared using a low-cost dip-coating method. The visible light activity of Cu–TiO2 in the aqueous solution was confirmed in relation to model organic compounds.

Characterization of Fe2O3-TiO2 Thin Films Prepared from Sonicated and Unsonicated Sols

2018 ◽  
Vol 762 ◽  
pp. 306-310
Author(s):  
Gundars Mežinskis ◽  
Darja Larionova ◽  
Liga Grase
Keyword(s):  
Thin Films ◽  
Visible Light ◽  
Dip Coating ◽  
Absorption Enhancement ◽  
Glass Substrates ◽  
Vis Spectroscopy ◽  
Coating Method ◽  
Visible Light Active ◽  
Commercial Applications ◽  
Dip Coating Method

The development of immobilized visible light-active photocatalysts has attracted growing scientific interest due to numerous potential commercial applications. In this work sonicated and unsonicated sols were used for the development of thin films on glass substrates. The coatings were prepared using Fe2O3-TiO2 sols containing 1-5 mol% Fe2O3 and 99-95 mol% TiO2. The coatings were obtained by dip-coating method and annealed at 500 °C for 1 hour. The synthesized samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV-Vis spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM). The ultrasound treatment of sols led to the reduction of the size of iron doped nanocrystals of TiO2 and absorption enhancement in the visible light.

Optical, magnetic and structural properties of Cr-doped ZnO thin films by sol–gel dip-coating method

2017 ◽  
Vol 4 (9) ◽  
pp. 096403 ◽  
Author(s):  
Zohra N Kayani ◽  
Marya Siddiq ◽  
Saira Riaz ◽  
Shahzad Naseem
Keyword(s):  
Thin Films ◽  
Structural Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
Zno Thin Films ◽  
Coating Method ◽  
Doped Zno ◽  
Dip Coating Method

Effect of ZnO on a Superhydrophilic Self-Cleaning Properties of TiO2/SiO2 Thin Film on Glass Slide Substrate

2015 ◽  
Vol 1131 ◽  
pp. 237-241 ◽  
Author(s):  
Akkarat Wongkaew ◽  
Chanida Soontornkallapaki ◽  
Naritsara Amhae ◽  
Wichet Lamai
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Visible Light ◽  
Band Gap ◽  
Sol Gel ◽  
Dip Coating ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Coating Method ◽  
Dip Coating Method

This work aims to study the effect of ZnO containing in TiO2/SiO2 film on the superhydrophilic property after exposed to different types of light. The metal solutions were prepared by sol-gel technique and the film was deposited on glass slides by dip coating method. The parameter studied was the amount of ZnO in the TiO2/SiO2 film. The contents of ZnO were 5-20% weight (increased by 5%). The amount of TiO2 was constant at 30% weight. The obtained films were analyzed for their roughness. The results indicated that film roughness changed according to the ZnO contents. With 5%ZnO in the thin film, the roughness was 0.726 nm while 20%ZnO obtained the roughness of 2.128 nm. UV-Vis spectrophotometer was used for measuring of transmittance of films. At wavelength of 550 nm, the transmittances of each film were greater than 90%. Band gap energy of each film was calculated from the transmittance data. It was found that the average band gap energy of the films was 2.47 eV. Then, the films contained various amount of ZnO were grouped into 2 sets. The first set was exposed to visible light while the other set was exposed to UV. The duration of exposure was 5 hr. Both sets of films after exposed to any light were kept in a black box controlled relative humidity of 85%. Each film was measured contact angle every day. It was found that the 30%TiO2/5%Zn/SiO2 film exposed to visible light showed the best superhydrophilic property. The contact angle was about 0-5° within 3 days. This may due to the reduction of band gap energy in the presence of ZnO in TiO2/SiO2 films to 2.41 eV and the roughness of the film.

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