scholarly journals The Effect of Polyethylene Glycol Addition on Wettability and Optical Properties of GO/TiO2 Thin Film

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4564
Author(s):  
Azliza Azani ◽  
Dewi Suriyani Che Halin ◽  
Kamrosni Abdul Razak ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Marcin Nabiałek ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Contact Angle ◽  
Optical Properties ◽  
Polyethylene Glycol ◽  
Water Contact Angle ◽  
Tio2 Thin Film ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Water Contact

Modification has been made to TiO2 thin film to improve the wettability and the absorption of light. The sol-gel spin coating method was successfully used to synthesize GO/TiO2 thin films using a titanium (IV) isopropoxide (TTIP) as a precursor. Different amounts of polyethylene glycol (PEG) (20 to 100 mg) were added into the parent sol solution to improve the optical properties and wettability of the GO/TiO2 thin film. The effect of different amounts of PEG was characterized using X-ray diffraction (XRD) for the phase composition, scanning electron microscopy (SEM) for microstructure observation, atomic force microscopy (AFM) for the surface topography, ultraviolet–visible spectrophotometry (UV-VIS) for the optical properties and wettability of the thin films by measuring the water contact angle. The XRD analysis showed the amorphous phase. The SEM and AFM images revealed that the particles were less agglomerated and surface roughness increases from 1.21 × 102 to 2.63 × 102 nm when the amount of PEG increased. The wettability analysis results show that the water contact angle of the thin film decreased to 27.52° with the increase of PEG to 80 mg which indicated that the thin film has hydrophilic properties. The optical properties also improved significantly, where the light absorbance wavelength became wider and the band gap was reduced from 3.31 to 2.82 eV with the presence of PEG.

Synthesis and Self-Cleaning Property of TiO2 Thin Film Doping with Fe3+, Al3+, Ce3+ Ions

2020 ◽  
Vol 20 (7) ◽  
pp. 4084-4091
Author(s):  
Chun Han ◽  
Lei Zhao ◽  
Manying Zhang ◽  
Lin Pan ◽  
Zhifeng Liu
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Tio2 Thin Film ◽  
Sol Gel ◽  
Molar Ratio ◽  
Water Contact ◽  
Cleaning Performance ◽  
Photogenerated Electrons ◽  
Self Cleaning

Enhancing the response to visible light and inhibiting recombination of photogenerated electrons and holes is a key point for strongly improved self-cleaning performances of TiO2 self-cleaning films. In this work, TiO2 thin film doping with three different ions (Fe3+, Al3+, Ce3+) on glass substrate respectively by sol–gel method to explore the effect of ions on self-cleaning performance of TiO2 thin films. All the prepared samples are characterized by XRD, SEM, UV-Vis and water contact angle tester. Moreover, the self-cleaning mechanism of doping TiO2 thin film is discussed. The water contact angle of TiO2 thin film doping with 9% Fe (molar ratio), 5% Ce and 5% Al are reach at 0°, respectively. In comparison with the water contact angle of pure TiO2 thin film (2.5°), TiO2 thin film doping with metal ions exhibit better self-cleaning property.

scholarly journals Microstructure Evolution of Ag/TiO2 Thin Film

2021 ◽  
Vol 7 (1) ◽  
pp. 14
Author(s):  
Dewi Suriyani Che Halin ◽  
Kamrosni Abdul Razak ◽  
Mohd Arif Anuar Mohd Salleh ◽  
Mohd Izrul Izwan Ramli ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Growth Rate ◽  
Synchrotron Radiation ◽  
Tio2 Thin Film ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Contact Mode ◽  
X Ray ◽  
Radiation Imaging

Ag/TiO2 thin films were prepared using the sol-gel spin coating method. The microstructural growth behaviors of the prepared Ag/TiO2 thin films were elucidated using real-time synchrotron radiation imaging, its structure was determined using grazing incidence X-ray diffraction (GIXRD), its morphology was imaged using the field emission scanning electron microscopy (FESEM), and its surface topography was examined using the atomic force microscope (AFM) in contact mode. The cubical shape was detected and identified as Ag, while the anatase, TiO2 thin film resembled a porous ring-like structure. It was found that each ring that coalesced and formed channels occurred at a low annealing temperature of 280 °C. The energy dispersive X-ray (EDX) result revealed a small amount of Ag presence in the Ag/TiO2 thin films. From the in-situ synchrotron radiation imaging, it was observed that as the annealing time increased, the growth of Ag/TiO2 also increased in terms of area and the number of junctions. The growth rate of Ag/TiO2 at 600 s was 47.26 µm2/s, and after 1200 s it decreased to 11.50 µm2/s and 11.55 µm2/s at 1800 s. Prolonged annealing will further decrease the growth rate to 5.94 µm2/s, 4.12 µm2/s and 4.86 µm2/s at 2400 s, 3000 s and 3600 s, respectively.

scholarly journals Characteristics and optical properties of Fe3+ doped SiO2/TiO2 thin films prepared by the sol-gel dip-coating method

2013 ◽  
Vol 16 (1) ◽  
pp. 92-100
Author(s):  
Chien Mau Dang ◽  
Dam Duy Le ◽  
Tam Thi Thanh Nguyen ◽  
Dung Thi My Dang
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
Water Contact ◽  
Glass Substrates ◽  
Coating Method ◽  
Dip Coating Method

In this study, we have successfully synthesized Fe3+ doped SiO2/TiO2 thin films on glass substrates using the sol-gel dip-coating method. After synthesizing, the samples were annealed at 5000C in the air for 1 hour. The characteristics and optical properties of Fe3+ doped SiO2/TiO2 films were then investigated by X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis) and Fourier transform infrared spectroscopy (FT-IR). An antifogging ability of the glass substrates coated with the fabricated film is investigated and explained by a water contact angle under visible-light. The analyzed results also show that the crystalline phase of TiO2 thin films comprised only the anatase TiO2, but the crystalline size decreased from 8.8 to 5.9 nm. We also observed that the absorption edge of Fe3+- doped SiO2/TiO2 thin films shifted towards longer wavelengths (i.e. red shifted) from 371.7nm to 409.2 nm when the Fe3+-doped concentration increased from 0 to 1 % mol.

scholarly journals Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1050
Author(s):  
Natangue Heita Shafudah ◽  
Hiroki Nagai ◽  
Yutaka Suwazono ◽  
Ryuhei Ozawa ◽  
Yukihiro Kudoh ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Quartz Glass ◽  
Glass Substrate ◽  
Quartz Glass Substrate ◽  
Electrospray Deposition ◽  
Water Contact ◽  
X Ray

Titania precursor films were electrosprayed on a quartz glass substrate, which was pre-modified with an ultra-thin film obtained by spin-coating a single-walled carbon nanotube (SWCNT) dispersed solution. The X-ray diffraction patterns of the thin films obtained by heat-treating the precursor films at 500 °C in air for 1 h indicated that the formed crystals were anatase. A new route to fabricate transparent thin films on the insulating substrate via electrospray deposition (ESD) was thus attained. The photoluminescence spectrum of the thin film showed a peak at 2.23 eV, assignable to the self-trapped exciton of anatase. The Raman spectrum of the thin film demonstrated that heat treatment is useful for removing SWCNTs. The thin film showed a water contact angle of 14 ± 2° even after being kept under dark conditions for 1 h, indicating a high level of hydrophilicity. Additionally, the thin film had a super-hydrophilic surface with a water contact angle of 1 ± 1° after ultraviolet light irradiation with an intensity of 4.5 mW cm−2 at 365 nm for 1 h. The importance of Ti3+ ions in the co-present amorphous phase, which was dominantly formed via the ESD process, for hydrophilicity was also clarified by means of X-ray photoelectron spectroscopy.

scholarly journals Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO2 Thin Film

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1360
Author(s):  
Sangbin Park ◽  
Younghwa Yoon ◽  
Sehyun Lee ◽  
Taejun Park ◽  
Kyunghwan Kim ◽  
...  
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Uv Irradiation ◽  
Tio2 Thin Film ◽  
Maintenance Cost ◽  
Tio2 Films ◽  
Hydrophilic Surface ◽  
Water Contact ◽  
Defect Sites

To achieve self-cleaning at a low maintenance cost, we investigated the possibility of obtaining a sustainable hydrophilic surface of TiO2 thin film. As the hydrophilicity of TiO2 films fabricated by FTS has not yet been studied, we deposited TiOx using FTS, and then TiO2 was formed through additional treatment. Hydrophilic surfaces were obtained by thermoinduced and photoinduced methods. UV irradiation led to the conversion of Ti4+ to Ti3+ in the lattice structure and an increase in the number of OH groups on the surface, and annealing induced the formation of Ti3+ defect sites, as well as organic degradation and changes in the crystal structure. Through the annealing process, the water contact angle of as-deposited film was decreased from 78.7° to 35.7°, and crystallinity changed from amorphous to anatase. These changes contributed to the formation of a hydrophilic surface and reduced the water contact angle by up to 10.8°. After the formation of a hydrophilic surface through annealing and UV irradiation, the sample returned to its original state. We confirmed that the water contact angle of the returned sample was decreased through exposure to sunlight; it reduced the water contact angle of the returned sample by 15.2°. Thus, the results revealed that the crystallinity influences the hydrophilicity and its sustainability for TiO2 films under sunlight.

STRUCTURAL, OPTICAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF NANOCRYSTALLINE TiO2 THIN FILMS DEPOSITED BY SOL-GEL SPIN COATING

2019 ◽  
Vol 7 (1) ◽  
pp. 28
Author(s):  
KOMARAIAH DURGAM ◽  
RADHA EPPA ◽  
REDDY M. V. RAMANA ◽  
KUMAR J. SIVA ◽  
R. SAYANNA ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Photocatalytic Activity ◽  
Spin Coating ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Nanocrystalline Tio2

Effects of Co doping on the phase transformation and optical properties of TiO2 thin films by sol–gel method

2011 ◽  
Vol 44 (3) ◽  
pp. 550-554 ◽  
Author(s):  
Jianjun Tian ◽  
Hongmei Deng ◽  
Lin Sun ◽  
Hui Kong ◽  
Pingxiong Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
Optical Properties ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Doping

Design and fabrication of polydopamine based superhydrophobic fabrics for efficient oil-water separation

Soft Matter ◽  
2021 ◽  
Author(s):  
Jixi Zhang ◽  
Ligui Zhang ◽  
Xiao Gong
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sol Gel ◽  
High Water ◽  
Water Contact ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Fabric Surface

In this work, we prepare a PDMS-SiO2-PDA@fabric with high water contact angle (WCA=155o). Combining dopamine self-polymerization and sol-gel method, SiO2 is in situ grown on a PDA-modified fabric surface to...

scholarly journals Photocatalytic Degradation of Different VOCs in the Gas-Phase over TiO2 Thin Films Prepared by Ultrasonic Spray Pyrolysis

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 915 ◽  
Author(s):  
Ibrahim Dundar ◽  
Marina Krichevskaya ◽  
Atanas Katerski ◽  
Malle Krunks ◽  
Ilona Oja Acik
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Degradation ◽  
Spray Pyrolysis ◽  
Tio2 Thin Film ◽  
Ultrasonic Spray Pyrolysis ◽  
Airflow Rate ◽  
Tio2 Films ◽  
Tio2 Thin Films ◽  
Ultrasonic Spray

In this study, we deposited TiO2 thin films onto borosilicate glass by ultrasonic spray pyrolysis at 350 and 450 °C. The aim of study is to determine the effect of deposition temperature on photocatalytic activity of TiO2 thin films and to investigate the performance of TiO2 thin films on photocatalytic degradation of methyl tert-butyl ether (MTBE), acetone, acetaldehyde, and heptane as functions of different operating parameters. TiO2 thin films deposited at 350 and 450 °C have a thickness value of 190 and 330 nm, respectively. All as-prepared TiO2 films possess an anatase crystalline structure. According to the X-ray photon spectroscopy (XPS) study, the TiO2 thin film deposited at 350 °C showed a higher amount of oxygen vacancies and hydroxyl groups on the film surface after UV treatment. The aged-TiO2 thin film deposited at 350 °C showed a water contact angle (WCA) value of 0° after 10 min UV irradiation, showing superhydrophilic surface behavior. The TiO2 film deposited at 350 °C exhibited the highest amount of conversion of MTBE (100%). The results also showed that TiO2 films are capable of photocatalytic degradation of MTBE (100%) and acetaldehyde (approx. 80%) in humid air conditions and high airflow rate. The visible-light-activity of TiO2 thin films was tested with 5 ppm MTBE and acetone. TiO2 thin films deposited at 350 °C with a surface area of 600 cm2 showed 60% of MTBE and 33% of acetone degradation under VIS light.

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