scholarly journals Low-Temperature Synthesis of Vanadium Dioxide Thin Films by Sol-Gel Dip Coating Method

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Ladawan Chotirat ◽  
Sutham Niyomwas ◽  
Witthawat Wongpisan ◽  
Sitthisuntorn Supothina
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Vanadium Dioxide ◽  
Near Infrared ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Tube Furnace ◽  
Vacuum Tube ◽  
Synthesis Conditions

The vanadium dioxide (VO2) thin films were synthesized by sol-gel dipping on a glass slide substrate at low temperature of 500°C in a vacuum tube furnace at a pressure of 2 × 10−3 mbar by 2-step calcination without an intermediate gas purging. Synthesis conditions, including temperature, vacuum pressure, and calcination steps in the vacuum tube furnace, were investigated to find the optimum condition that promoted the formation of VO2 phase. It was found that the 2nd calcination step was very important in realizing the monoclinic vanadium dioxide (VO2 (M)). The results of the valence electron analysis revealed the outstanding phase of VO2 and a small amount of V2O5 and V2O3 phases. The small crystallites of the VO2 were homogeneously distributed on the surface, and the grain was of an irregular shape of ∼220−380 nm in size. The film’s thickness was in a range of 69−74 nm. The film exhibited a metal-to-insulator transformation temperature of ∼68oC and good thermochromic property. Visible optical transmittance remained at ∼40−50% when the sample’s temperature changed from 25 to 80°C for a near infrared (NIR) region.

Effect of Withdrawal Speed on the Structural, Optical and Morphological Properties of NiO Thin Films Obtained by Sol-Gel Dip Coating Method

2017 ◽  
Vol 31 ◽  
pp. 29-35 ◽  
Author(s):  
Abdelouahab Noua ◽  
Rebai Guemini ◽  
Hichem Farh ◽  
Mourad Zaabat
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Morphological Properties ◽  
Speed Increase ◽  
Withdrawal Speed ◽  
Coating Method ◽  
Dip Coating Method

In this study, pure nickel oxide thin films were prepared by a sol-gel dip coating method with different withdrawal speeds, onto glass substrates and their structural, optical and morphological properties were investigated. The structural properties of NiO films were characterized by X-ray diffraction (XRD), Polycrystalline structures of the prepared films were detected. The optical properties of the films were studied by UV–visible spectrophotometer and the optical transmittance of the films within the visible and near infrared region was found to be more than 75% and decrease when the withdrawal speed increase. The surface morphology of the films was observed by atomic force microscopy and it was found that the root mean square (RMS) roughness increases from 3.78 to 15 nm when the withdrawal speed increased from 30 to70 mm/min. Thus, the withdrawal speed is a key factor to change the NiO thin films properties.

Photocatalytic Degradation of Methylene Blue by NiO Thin Films under Solar Light Irradiation

2019 ◽  
Vol 56 ◽  
pp. 152-157 ◽  
Author(s):  
Abdelouahab Noua ◽  
Hichem Farh ◽  
Rebai Guemini ◽  
Oussama Zaoui ◽  
Tarek Diab Ounis ◽  
...  
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Visible Region ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Light Irradiation ◽  
Solar Light ◽  
Solar Light Irradiation

Nickel oxide (NiO) thin films were successfully deposited by sol-gel dip-coating method on glass substrates. The structural, morphological and optical properties in addition to the photocatalytic activity of the prepared films were investigated. The results show that the films have a polycrystalline NiO cubic structure with dense NiO grains and average optical transmittance in the visible region. The photocatalytic properties of the films were studied through the degradation of methylene blue and 89% of degradation was achieved for 4.5h of solar light irradiation exposure which indicates the capability of NiO photocatalytic activity.

FABRICATION AND CHARACTERIZATION OF AQUEOUS SOL–GEL-DERIVED LaFeO3 THIN FILMS

2000 ◽  
Vol 14 (22n23) ◽  
pp. 801-808 ◽  
Author(s):  
M. RAJENDRAN ◽  
M. GHANASHYAM KRISHNA ◽  
A. K. BHATTACHARYA
Keyword(s):  
Thin Films ◽  
Single Phase ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Average Particle Size ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Correlation Spectroscopy ◽  
Average Particle ◽  
X Ray

A novel all-inorganic aqueous sol–gel process has been developed to fabricate LaFeO3 thin films by dip-coating. Stable, positively charged colloidal sol particles of hydrous lanthanum ferrite with an average particle size (Z av ) of 7 nm were prepared and coated onto quartz plates under controlled conditions. The sols have been characterized using photon correlation spectroscopy (PCS) for Z av and size distribution. The redispersible gel was characterized by thermogravimetric and differential thermal analysis (TG-DTA) and also by isothermal heating followed by X-ray diffraction to identify the reaction sequence to form LaFeO 3. The sol–gel films as deposited were X-ray amorphous on heating up to 500°C, partially crystalline at 600°C, fully crystalline and single phase at 650°C and above. These films were continuous, polycrystalline, single phase, had uniform thickness in the range between 180 to 1000 nm, depending on deposition conditions, and showed about 80% optical transmittance. The optical band gap varied from 2.7 to 3.3 eV as a function of the annealing temperature. The refractive index increased with increase in annealing temperature from 1.55 at 500°C to 1.86 at 800°C.

CADMIUM-DOPED Co3O4 THIN FILMS: SYNTHESIS AND CHARACTERIZATION

2019 ◽  
Vol 26 (01) ◽  
pp. 1850134 ◽  
Author(s):  
CHERIFA DALACHE ◽  
HADJ BENHEBAL ◽  
BEDHIAF BENRABAH ◽  
AEK AMMARI ◽  
ABDELMALEK KHARROUBI ◽  
...  
Keyword(s):  
Thin Films ◽  
Impedance Spectroscopy ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Thin Layers ◽  
Bandgap Energy ◽  
Molar Ratios ◽  
Glass Substrates ◽  
Vis Spectroscopy

This paper contains the results of the structural and spectroscopic characterizations of undoped and Cadmium-doped cobalt oxide thin films with different Co/Cd molar ratios (3%, 5%, 7% and 9%). The nanosized undoped and cadmium-doped Co3O4 thin layers were prepared using sol–gel process and deposited on glass substrates by dip coating. The changes caused by the incorporation of cadmium at different levels of doping have been highlighted by the techniques UV–Visible (UV–Vis) spectroscopy, Infrared (IR) spectroscopy, X-ray diffraction (XRD) measurements, SEM coupled EDX and impedance spectroscopy. From the UV–Vis spectroscopy analysis, it was found that all the films are two direct bandgap energies. The optical transmittance and the bandgap energy decrease with increase in Cd concentration. The XRD spectra confirm the films were polycrystalline with a cubic spinel structure. The results of the impedance spectroscopy show that the equivalent circuit of the synthesized samples is an RC parallel circuit.

Structural, optical, and electrical properties of ZnO thin films deposited by sol-gel dip-coating process at low temperature

2014 ◽  
Vol 10 (4) ◽  
pp. 869-878 ◽  
Author(s):  
Soaram Kim ◽  
Giwoong Nam ◽  
Hyunsik Yoon ◽  
Hyunggil Park ◽  
Hyonkwang Choi ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Low Temperature ◽  
Sol Gel ◽  
Dip Coating ◽  
Zno Thin Films ◽  
Coating Process ◽  
Optical And Electrical Properties

Effect of PVP Addition on Microstructure of SrZrO3 Thin Films on Bi(2223) Tapes

2005 ◽  
Vol 486-487 ◽  
pp. 570-573
Author(s):  
Yo Seung Song ◽  
Deuk Yong Lee ◽  
Se Jong Lee ◽  
Bae Yeon Kim ◽  
Shin Nam Hong
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Low Temperature ◽  
Treatment Time ◽  
Sol Gel ◽  
Crack Density ◽  
Dip Coating ◽  
Drying Time ◽  
Coating Method ◽  
Dip Coating Method

SrZrO3 resistive oxides on Ag sheathed Bi(2223) tapes were prepared by the sol-gel and dip-coating method to investigate the effect of PVP content and thermal stage on microstructure of the films. Although film thickness rose with the addition of PVP, the amount of PVP was not effective to reduction in the crack density of the films. However, longer drying time at low temperature and shorter heat treatment time at 500oC were effective for controlling the microcracks of the SrZrO3 films, indicating that the microcracking of the films was governed primarily by the thermal stage.

scholarly journals Synthesis and Properties of (Bi, Cd)-doped CuMn2O4 thin films by sol-gel dip-coating method

2021 ◽  
Vol 22 (4) ◽  
pp. 734-741
Author(s):  
Abdelmalek Kharroubi ◽  
Aboulkacem Khiali ◽  
Hadj Benhebal ◽  
Bedhiaf Benrabah ◽  
Salima Lellou ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Metallic Elements ◽  
Spinel Oxides ◽  
Coating Method ◽  
Dip Coating Method ◽  
The University ◽  
Physical Engineering

The present work is carried out within the framework of a research project launched within the physical engineering laboratory at the University of Tiaret in Algeria. The objective is to optimize the conditions for producing thin films of pure spinel oxides doped with different metallic elements. Thus, in this part, we prepared thin films of pure CuMn2O4 and doped with Bi and Cd at rates of 6 and 9% by the sol-gel Dip-coating method. The materials obtained exhibit acceptable crystallinity, excellent optical transmittance with bandgap energies of between 1.64 eV and 1.9 eV and good electrical conductivity.

Fabrication of (Ba,Sr)TiO3 Thin Films by Hydrothermal Crystallization of Sol-Gel Precursor

2007 ◽  
Vol 336-338 ◽  
pp. 95-97
Author(s):  
Jing Yun Ma ◽  
Hong Yan Miao ◽  
Guo Qiang Tan ◽  
Zheng Qiu Sun
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Sol Gel ◽  
Single Crystal Silicon ◽  
Dip Coating ◽  
Critical Parameters ◽  
Precursor Film ◽  
Hydrothermal Crystallization ◽  
Crystal Silicon ◽  
Bst Thin Films

Barium strontium titanate (BST) ferroelectric thin films have been successfully prepared on the single crystal silicon substrates using hydrothermal crystallization of sol-gel precursor, which combined the conventional sol-gel process and the hydrothermal method. The precursor film was deposited by the dip-coating method. The multiplayer BST gel films were hydrothermally treated in a Teflon vessel at low temperature of 160-180 °C for 1-3.5 h. The influences of the reaction conditions on the structure and crystallizing degree of BST thin films were discussed. We find that the temperature of as-dried gel films and post hydrothermal treatment are the critical parameters determining the quality of formation of BST thin films. Under optimized conditions, we can obtain well-developed perovskite BST films with smooth and pinhole-free surfaces. These results reveal that this technique is a promising low temperature process for the fabricating of thin films.

Structure and Optical Properties of TiO2 Thin Films Prepared by a Sol-Gel Processing

2019 ◽  
Vol 74 (7) ◽  
pp. 635-642
Author(s):  
Zohra N. Kayani ◽  
Mehawish Saleem ◽  
Saira Riaz ◽  
Shahzad Naseem ◽  
Farhat Saleemi
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Sol Gel ◽  
Dip Coating ◽  
Photovoltaic Devices ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
Withdrawal Speed ◽  
Gel Processing

AbstractTitanium dioxide (TiO2) thin films were deposited on CR-39 by a sol-gel dip coating route with different withdrawal speeds ranging from 250 to 350 mm/s. The TiO2 thin films were characterised by x-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, ellipsometry, and ultraviolet (UV)-visible (VIS)-near infrared (NIR) spectro-photometry. The role of withdrawal speed on the thickness of thin films to tailor properties of TiO2 thin films was studied. The XRD results revealed that all the films are amorphous in nature. TiO2 thin films deposited at different withdrawal speeds exhibit a decrease in transmission with an increase in speed. The direct optical band gap of the films has been estimated to be in the range 3.48–3.00 eV by UV-VIS-NIR spectro-photometry and 3.52–3.38 eV by ellipsometry. TiO2 is a potential prospect in microelectronic applications and can serve as an absorber layer for photovoltaic devices. Surface morphology is granular with an increase in grain size and an increase in withdrawal speed.

Study on the Grain Size of Vanadium Dioxide Thin Films using Sol-gel Spin Coating Method

2018 ◽  
Author(s):  
Ibrahim Mohd Yazid ◽  
Muhammad Hazim Raselan ◽  
Shafinaz Sobihana Shariffudin ◽  
Puteri Sarah Mohamad Saad ◽  
Sukreen Hana ◽  
...  
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Vanadium Dioxide ◽  
Spin Coating ◽  
Sol Gel ◽  
Spin Coating Method ◽  
Coating Method ◽  
Vanadium Dioxide Thin Films
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