Porous TiO2 Films Prepared by Sol-Gel Method Using Different Kinds of Templates

2011 ◽  
Vol 382 ◽  
pp. 344-347
Author(s):  
Wen Jie Zhang ◽  
Bo Yang ◽  
Hong Bo He
Keyword(s):  
Degradation Rate ◽  
Sol Gel ◽  
Dip Coating ◽  
High Photocatalytic Activity ◽  
Maximum Activity ◽  
Coating Process ◽  
Tio2 Films ◽  
Methyl Orange Degradation ◽  
Porous Tio2 ◽  
Glass Substrates

Porous TiO2 films were prepared through dip-coating on glass substrates using several different templates. Dip-coating process was optimized to prepare the three layered films. The film prepared with PEG1000 has the maximum activity compared with the other films using CTAB and HST. While PEG molecular weight is in the range from 400 to 6000, methyl orange degradation rate reaches its maximal value when using PEG1000. Two comparatively high activities can be found at the ratios of PEG1000:PEG400 as 3:1 and 1:2. The 1:2 ratio is the optimal one. PEG1000 seems to be more suitable of being used as a template to prepare porous TiO2 film with high photocatalytic activity. After 200 min of irradiation, 98.6 % of the initial dye can be degraded on the film prepared using 2 g of PEG1000.

Structure and Morphology of Sol-Gel Nanocrystalline TiO2 Films Coated on Glass Substrates

2010 ◽  
Vol 434-435 ◽  
pp. 565-567
Author(s):  
G.J. Ji ◽  
Zhi Ming Shi ◽  
G. Zhao
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Rutile Phase ◽  
Dip Coating ◽  
Tio2 Films ◽  
Nanocrystalline Tio2 ◽  
Doped Tio2 ◽  
Glass Substrates ◽  
Dip Coating Technique

The Ce3+-doped and undoped nanocrystalline TiO2 films were prepared on glass substrates surface by sol-gel dip coating technique. The crystal structure and surface morphology of TiO2 films were characterized by means of X-ray diffractometer (XRD), transmission electron microscopy (TEM) and atomic force microscope (AFM). The results indicated that the Ce3+-doped TiO2 films were solely composed of the anatase phase whereas in the undoped films small amount of the rutile phase of TiO2 were present. The average crystallite size of the undoped TiO2 films was about 30nm and was decreased with Ce3+-doping in the TiO2 films. Moreover, the grains distributed more uniform and the surface roughness was smaller in the Ce3+-doped TiO2 films than in the undoped one. The action mechanism of Ce3+-doping inhibits the crystallization of the rutile phase and decreases the anatase granularity of TiO2 films is associated with its physicochemical properties, as well as ionic diffusion and valance change of Ce3+ to Ce4+ in the sintering process.

Influence of Calcination Temperature on the Microstructure of Porous TiO2 Film

2008 ◽  
Vol 569 ◽  
pp. 17-20 ◽  
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Eiji Watanabe ◽  
Hiroshi Taoda
Keyword(s):  
Calcination Temperature ◽  
Tio2 Film ◽  
Dip Coating ◽  
Tio2 Films ◽  
Nanosized Particle ◽  
Porous Tio2 ◽  
Glass Substrates ◽  
Trehalose Dihydrate ◽  
Dip Coating Technique ◽  
Hydrolysis Of

To obtain porous TiO2 film, the precursor sol was prepared by hydrolysis of Ti isopropoxide and then complexed with trehalose dihydrate. The porous TiO2 film was fabricated by dip-coating technique on glass substrates using this solution. The TiO2 film was calcined at 500 °C. The maximum thickness of the film by one–run dip-coating was ca. 740 nm. The film was composed of nanosized particle and pore. The porosity of the TiO2 film was increased by the addition of trehalose dihydrate to the sol. The porous TiO2 films were calcined at various temperatures. The effects of the calcination temperature on the microstructure of the porous TiO2 film were investigated. The porous film prepared from sol containing trehalose still kept the porous structure for calcination at 950 °C. The phase transition temperature from anatase to rutile of the film was shifted from 650 to 700 °C by trehalose addition to the sol.

Photoactivity of TiO2 Films on Glass Substrate for Cyanide Degradation

2010 ◽  
Vol 93-94 ◽  
pp. 87-90 ◽  
Author(s):  
Chabaiporn Junin ◽  
Pimpa Limthongkul ◽  
Chanchana Thanachayanont
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Dip Coating ◽  
Degree Of Crystallinity ◽  
Tio2 Films ◽  
Glass Substrates ◽  
Calcination Temperatures ◽  
Poly Ethylene ◽  
Triton X ◽  
Dip Coating Technique

A comparative study of TiO2 films on glass substrates produced by sol- gel dip coating technique using two types of titania precursors were performed. The two types of titania solutions with and without triton x-100, poly (ethylene glycol) were used to prepare the films. The dip coated films were dried at 55°C and calcined at 400 - 600°C for 4 hrs resulting in smooth and transparent TiO2 films. Morphology and phases of the films were investigated using SEM and XRD, respectively. Anatase phase was found to be dominant in all samples with various degree of crystallinity depending on the calcination temperatures and whether the templating agents were used. The templating agent was found to effectively inhibit the crystallization and growth of the crystallites of the films. Morphology of the TiO2 particles was found to be in the nanoscale level. All films fabricated were found to effectively degrade cyanide even though no obvious relations between processing method including calcinations temperature and the use of template were found.

Crystallization and Photoactivity of Tio2Films Formed on Soda Lime Glass by a Sol-Gel Dip-Coating Process

2005 ◽  
Vol 192 (3) ◽  
pp. 327-335 ◽  
Author(s):  
Seung Hun Oh ◽  
Jae Seong Kim ◽  
Jin Suk Chung ◽  
Eui Jung Kim ◽  
Sung Hong Hahn
Keyword(s):  
Sol Gel ◽  
Soda Lime ◽  
Dip Coating ◽  
Soda Lime Glass ◽  
Coating Process

Preparation and characterization of V2O5 doped SiO2-TiO2 thin films

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Marek Nocuń ◽  
Sławomir Kwaśny
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Dip Coating ◽  
Band Gap Energy ◽  
Tio2 Thin Films ◽  
Glass Substrates ◽  
Gel Technique

AbstractIn our investigation, V doped SiO2/TiO2 thin films were prepared on glass substrates by dip coating sol-gel technique. Chemical composition of the samples was studied by X-ray photoelectron spectroscopy (XPS). Transmittance of the samples was characterized using UV-VIS spectrophotometry. Subsequently band-gap energy (Eg) was estimated for these films. Powders obtained from sols were characterized by FTIR spectroscopy. It was found that vanadium decreases optical band gap of SSiO2/TiO2 films.

Changes of thickness and refractive index of silica sol-gel film by dip coating process

2014 ◽  
Vol 26 (7) ◽  
pp. 72005
Author(s):  
张日东 Zhang Ridong ◽  
严鸿维 Yan Hongwei ◽  
吕海兵 Lü Haibing ◽  
张尽力 Zhang Jinli ◽  
晏良宏 Yan Lianghong ◽  
...  
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Dip Coating ◽  
Silica Sol ◽  
Coating Process ◽  
Gel Film

Photocatalytic Degradation of Humic Acid Using Fe3+ and N-Doped 3SnO2/TiO2 Thin Films Coated on Glass Fibers

2014 ◽  
Vol 608 ◽  
pp. 164-169
Author(s):  
Peerawas Kongsong ◽  
Lek Sikong ◽  
Sutham Niyomwas ◽  
Vishnu Rachpech
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Humic Acid ◽  
Glass Fibers ◽  
Sol Gel ◽  
Composite Films ◽  
Dip Coating ◽  
High Photocatalytic Activity ◽  
Coating Methods ◽  
Uv Lamp

The Fe3+ and N–doped 3SnO2/TiO2 composite thin films and undoped films coated on glass fibers were prepared by sol–gel and dip–coating methods. The films were calcined at 600°C for 2 hour and characterized by XRD, SEM, EDS and XPS. The photocatalytic activity of the coated glass fibers was determined by means of degradation of a methylene blue (MB) solution and humic acid (HA). It was found that the optimized 20N/3SnO2/TiO2composite films exhibit a high photocatalytic activity and HA could be rapidly removed from water. The main factor affecting the HA degradation of 20N/3SnO2/TiO2 films is quantity of glass fibers loading, irradiation power of UV lamp and flow rate of water.

Characterization and Synthesis of Functional TiO2 Sol-Gel Coatings on the Glass

2006 ◽  
Vol 510-511 ◽  
pp. 94-97
Author(s):  
Dae Yong Shin ◽  
Myung Gi So ◽  
Sang Mok Han
Keyword(s):  
Thin Film ◽  
Crystal Structure ◽  
Spin Coating ◽  
Air Pollutants ◽  
Water Drop ◽  
Sol Gel ◽  
Molecular Size ◽  
Coating Process ◽  
Tio2 Films ◽  
Spin Coating Process

Thin film photocatalysts of TiO2 coated on the glass were prepared to self-clean and eliminate air pollutants by spin coating process with Ti(OC3H7 i)4, including PEG. The surface structure of TiO2 films changed according to the molecular size of PEG. It was found that NOx was efficiently eliminated by the TiO2 film photocatalyst. The contact angle of water drop on the TiO2 films decreased to less than 10°. It revealed the hydrophilic property of TiO2 films. The morphology and the crystal structure of TiO2 films were affected most.

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