scholarly journals Effect of various additives on aluminum oxide thin films prepared by dip coating, thermal behavior, kinetics and optical properties

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Mohammed Bouzbib ◽  
Maryam El Marouani ◽  
Katalin Sinkó
Keyword(s):  
Thin Films ◽  
Acetic Acid ◽  
Aluminum Oxide ◽  
Degradation Kinetics ◽  
Grazing Incidence ◽  
Dip Coating ◽  
Bandgap Energy ◽  
Oxide Thin Films ◽  
Wide Range ◽  
Optical Applications

AbstractAluminum oxide thin films attract research interest due to their properties. Aluminum acetate was used as an Al source with acetic acid, oxalic acid, and nitric acid as additives. The transmittance and the thickness of the films strongly depend on the additives, with the approximate bandgap energy changing from 5 ev to 5.4 ev. The aluminum oxide film deposited by dip-coating is presented great uniform surface morphology. The knowledge of the degradation kinetics of materials is essential for investigating the thermal stability of compounds. The acetic acid thin film proved to be the most efficient additive by demonstrating interesting optoelectronic properties. The thin films deposited by dip-coating were characterized by using X-ray grazing incidence diffraction, SEM, UV-Visible spectroscopy. Gamma aluminum oxide thin films prepared by acetic acid can be a good candidate for a wide range of optical applications.

scholarly journals Synthesis and Characterization of Polymeric (PMMA-PVA) Hybrid Thin Films Doped with TiO2 Nanoparticles Using Dip-Coating Technique

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 99
Author(s):  
Ahmad Alsaad ◽  
Abdul Raouf Al Dairy ◽  
Ahmad Ahmad ◽  
Issam A. Qattan ◽  
Shatha Al Fawares ◽  
...  
Keyword(s):  
Thin Films ◽  
Titanium Dioxide Nanoparticles ◽  
Dip Coating ◽  
Optical Bandgap ◽  
Bandgap Energy ◽  
Bandgap Engineering ◽  
Tio2 Nps ◽  
Polymeric Thin Films ◽  
Wide Range ◽  
Hybrid Thin Films

We report the synthesis of hybrid thin films based on Poly(MethylMethAcrylate) (PMMA) and Poly(VinylAlcohol) (PVA), doped with different concentrations of titanium dioxide nanoparticles (TiO2 NPs). As-prepared thin films of (PMMA-PVA) doped by TiO2 NPs (wt.% = 2%, 4%, 8%, and 16%) are deposited on glass substrate. Transmittance (T%), reflectance (R%), absorption coefficient (α), optical constants (n and k), and optical dielectric functions (ε1 and ε2) are deduced using the experimental transmittance and reflectance spectra. Furthermore, a combination of classical models such as Tauc, Urbach, Spitzer-Fan, and Drude models are applied to calculate the optical and optoelectronic parameters and the energy gaps of the prepared nanocomposite thin films. The optical bandgap energy of PMMA-PVA thin film is found to be 4.101 eV. Incorporation of TiO2 NPs into PMMA-PVA polymeric thin films leads to a decrease in the optical bandgap and thus bandgap engineering is possible. Fourier-transform infrared spectroscopy (FTIR) transmittance spectra of thin films are measured and interpreted to identify the vibrational modes. To elucidate the chemical stability, thermogravimetric (TGA) curves are measured. We found that (PMMA-PVA)/TiO2 NPs polymeric thin films are thermally stable below 110 °C enable them to be attractive for a wide range of optical and optoelectronic applications.

The effect of the withdrawal speed on properties of nickel oxide thin films

2019 ◽  
Vol 234 (10) ◽  
pp. 647-655
Author(s):  
Zohra Nazir Kayani ◽  
Atiqa Aslam ◽  
Rabia Ishaque ◽  
Syeda Nosheen Zahra ◽  
Hifza Hanif ◽  
...  
Keyword(s):  
Thin Films ◽  
Nickel Oxide ◽  
Band Gap ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Dip Coating ◽  
Oxide Thin Films ◽  
Withdrawal Speed ◽  
Sem Micrograph ◽  
Nickel Oxide Thin Films

Abstract Nickel oxide thin films have been prepared by sol-gel dip-coating technique on glass substrate. It is shown that nickel oxide thin films have poly crystalline nature. Nickel oxide thin films exhibit high transmission (39–85%) in the wavelength range of 400–900 nm, strong absorption between 300 and 400 nm wavelengths and decrease of band gap values are in the range 3.69–3.27 eV with increase of withdrawal speed. High band gap at low withdrawal speed is because of the small average crystallite size, which decreases with increase in withdrawal speed. The SEM micrograph shows cubic crystallites and surface of thin films become dense, smooth and homogeneous with an increase in withdrawal speed. Assessment of nickel oxide deposition conditions provides gateway for effective and cheap solar cells.

scholarly journals Aluminum tri-isopropoxide as an alternative precursor for atomic layer deposition of aluminum oxide thin films

2019 ◽  
Vol 37 (4) ◽  
pp. 040901 ◽  
Author(s):  
Fatemeh S. M. Hashemi ◽  
LiAo Cao ◽  
Felix Mattelaer ◽  
Timo Sajavaara ◽  
J. Ruud van Ommen ◽  
...  
Keyword(s):  
Thin Films ◽  
Atomic Layer Deposition ◽  
Aluminum Oxide ◽  
Atomic Layer ◽  
Oxide Thin Films ◽  
Layer Deposition
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