Synthesis and Characterization of BaTiO3/CoFe2O4 thin films

2011 ◽  
Vol 1368 ◽  
Author(s):  
Helen R. C. S. Andrade ◽  
Luciana M. Seara ◽  
Nelcy D. S. Mohallem
Keyword(s):  
Thin Films ◽  
Barium Titanate ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Dip Coating ◽  
Ferroelectric Materials ◽  
Nanocomposite Films ◽  
Ferrite Film ◽  
Vis Spectroscopy ◽  
Quartz Substrates

ABSTRACTNanocomposites formed by ferrimagnetic and ferroelectric materials are multiferroic material in which magnetoelectric coupling occurs via piezoelectricity and magnetostriction phenomena. These nanocomposites have a variety of applications in tunable microwave devices using electric control of spin wave propagation or new magnetic memories in which the magnetic response is controlled by electric field.In this work, transparent and homogeneous thin films of barium titanate interleaved with cobalt ferrite were prepared by sol–gel method using dip-coating process. Films of pure barium titanate and cobalt ferrite were also prepared for comparison. The nanocomposite films were deposited onto clean quartz substrates, where a coating of each material was deposited interleaved, where the cobalt ferrite film formed the last layer. The films were dried in air after each dipping and heated at 900 oC for 1 hour to convert the amorphous films into crystalline ones. The samples were characterized by low angle X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) and UV-Vis spectroscopy.

scholarly journals Optical, Structural, and Crystal Defects Characterizations of Dip Synthesized (Fe-Ni) Co-Doped ZnO Thin Films

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1737 ◽  
Author(s):  
Ahmad M. Alsaad ◽  
Ahmad A. Ahmad ◽  
Qais M. Al-Bataineh ◽  
Areen A. Bani-Salameh ◽  
Hadeel S. Abdullah ◽  
...  
Keyword(s):  
Thin Films ◽  
Structural Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
Crystal Defects ◽  
Nanocomposite Films ◽  
Zno Thin Films ◽  
Line Profile Analysis ◽  
Doped Zno ◽  
Co Doped

Sol-gel technique is used to synthesize as-grown zinc oxide (ZnO) and iron-nickel (Fe-Ni) co-doped ZnO thin films deposited on glass substrates using dip coating technique. The structural properties and crystal imperfections of as-prepared thin films are investigated. We performed the structural analysis of films using X-ray diffraction (XRD). The XRD analysis reveal that the as-prepared films exhibit wurtzite structure. Furthermore, XRD-line profile analysis is performed to study the correlation between structural properties and imperfections of the nanocomposite thin films. The crystallite size and microstrains parameters are predicted using the Williamson–Hall method. We found that the crystallites size increases as the co-doped (Fe-Ni) concentration is increased. However, microstrains of the nanocomposite films decreases as (Fe-Ni) concentration is increased. The optical properties of the (Fe-Ni) co-doped nanocomposite films are investigated by performing UV-Vis (250 nm–700 nm) spectrophotometer measurements. We found that as the (Fe-Ni) concentration level is steadily increased, transmittance of the undoped ZnO thin films is decreased. Remarkably, refractive index of undoped ZnO thin films is found to exhibit values extending from 1.55 to1.88 that would increase as (Fe-Ni) concentration is increased.

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.

scholarly journals The Influence of Annealing Temperature on the Structural and Optical Properties of ZrO2 Thin Films and How Affects the Hydrophilicity

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 454 ◽  
Author(s):  
A. Méndez-López ◽  
O. Zelaya-Ángel ◽  
M. Toledano-Ayala ◽  
I. Torres-Pacheco ◽  
J.F. Pérez-Robles ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Average Particle Size ◽  
Dip Coating ◽  
Visible Range ◽  
Average Particle ◽  
Structural And Optical Properties ◽  
Air Atmosphere ◽  
Vis Spectroscopy

Zirconium oxide (ZrO2) thin films were prepared by the sol-gel dip coating technique, in combination with annealing at different temperatures in air atmosphere, with the final goal of studying the water wettability of the surface. The annealing effects on the structural and optical properties of the ZrO2 films were investigated to check the characteristics of the material. X-ray diffraction (XRD) patterns of ZrO2 annealed at 450 °C and 550 °C show the formation of tetragonal phase, with layers constituted by nanoparticles with average particle size of 21 nm and 25 nm, respectively. Fourier-transform infrared spectroscopy (FT-IR) spectra revealed the presence of vibrational modes associated to ZrO2. Photoluminescence (PL) and ultraviolet-visible spectroscopy (UV–Vis) spectroscopy was used for optical properties. All deposited ZrO2 thin films presented a high optical transparency, with an average transmittance above 70% in the visible range (400–700 nm). The hydrophilic properties of ZrO2 films were characterized by means of the measurements of the contact angle. When the sample was annealed at 550 °C, the hydrophilicity reached the best behavior, which was explained as an effect of the structural and morphological change of the films.

scholarly journals Highly-transparent perovskite thin films obtained by a wet chemical processesing method

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Rouholah Ashiri
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Barium Titanate ◽  
Sol Gel ◽  
Dip Coating ◽  
Propagation Loss ◽  
Optical Propagation ◽  
Coating Method ◽  
Optical Applications ◽  
Reported Data

Barium titanate thin films are key materials for use in the solid-state devices, including capacitors, memories, thermistors, sensors, actuators and so on. High transmittance barium titanate thin films are suitable candidate for various electro-optic applications such as dielectric mirrors. In this research high transmittance barium titanate nanothin films were prepared by sol - gel dip - coating method, then the optical properties of the prepared nanofilms was characterized. Experimental results indicate that the surface morphology of prepared nanothin films were improved and as a result of that, a better optical properties, less optical losses were obtained in contrast with other reported data. It was found that optical propagation loss of barium titanate nanothin film was much lower than normal polycrystalline barium titanate thin film. Results also indicate that Increment of the calcination temperature reduces the thin films transparency and thickness.  Other results show that increment of withdrawal rate of the substrate from the prepared sol lead to increment of thin films thickness and decrease in thin films transparency. The prepared high transparent nanothin film was amourphous and was as thin as 30 nm. It seems to us that, prepared barium titanate nanothin films would be suitable for several optical and electro-optical applications.

Formation Study of Nanocomposite Thin Films of Ferrite Dispersed in a Silica Matrix Prepared by sol-Gel Process

2003 ◽  
Vol 775 ◽  
Author(s):  
Nelcy D. S. Mohallem ◽  
Luciana M. Seara
Keyword(s):  
Thin Films ◽  
Saturation Magnetization ◽  
Cobalt Ferrite ◽  
Amorphous Matrix ◽  
Sol Gel ◽  
Dip Coating ◽  
Silica Matrix ◽  
Coating Process ◽  
Sol Gel Process ◽  
Nanocomposite Thin Films

AbstractMagnetic nanocomposite thin films formed by cobalt ferrite dispersed in silica matrix were prepared by sol-gel process using tetraethylorthosilicate (TEOS) as a precursor of silica, and metallic nitrates as precursors of the ferrite. The films were prepared with 5–50 wt. % ferrite contents and deposited on substrate using the dip-coating process. The films obtained were adherent, transparent, homogeneous and free of microcracks, with thickness between 30 and 500 nm. The films obtained presented crystalline CoFe2O4 phases dispersed in SiO2 amorphous matrix and saturation magnetization of approximately 9 emu/g considering the composite mass and 30 emu/g considering the ferrite mass.

High Transmission and Low Resistivity Cadmium Tin Oxide Thin Films Deposited by Sol-Gel

2014 ◽  
Vol 1675 ◽  
pp. 151-156 ◽  
Author(s):  
Carolina. J. Diliegros Godines ◽  
Rebeca Castanedo Pérez ◽  
Gerardo Torres Delgado ◽  
Orlando Zelaya Ángel
Keyword(s):  
Thin Films ◽  
Tin Oxide ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Corning Glass ◽  
Vacuum Atmosphere ◽  
Xrd Patterns ◽  
Quartz Substrates

ABSTRACTTransparent conducting cadmium tin oxide (CTO) thin films were obtained from a mixture of CdO and SnO2 precursor solutions by the dip-coating sol-gel technique. The thin films studied in this work were made with 7 coats (∼200 nm) on corning glass and quartz substrates. Each coating was deposited at a withdrawal speed of 2 cm/min, dried at 100°C for 1 hour and then sintered at 550°C for 1 hour in air. In order to decrease the resistivity values of the films, these were annealed in a vacuum atmosphere and another set of films were annealed in an Ar/CdS atmosphere. The annealing temperatures (Ta) were 450°C, 500°C and 550°C, as well as 600°C and 650°C, when corning glass and quartz substrates were used, respectively. X-Ray diffraction (XRD) patterns of the films annealed in a vacuum showed that there is only the presence of CTO crystals for 450°C≤ Ta ≤ 600°C and CTO+SnO2 crystals for Ta=650°C. The films annealed in Ar/CdS atmosphere were only constituted of CTO crystals independent of the Ta. The minimum resistivity value obtained was ∼4 x 10-4 Ωcm (Rsheet= 20 Ω/□) for the films deposited on quartz and annealed at Ta=600°C under an Ar/CdS atmosphere. The films deposited on quartz showed the higher optical transmission (∼90%) with respect to the films deposited on corning glass substrates (∼85%) in the Uv-vis region. For their optical and electrical characteristics, these films are good candidates as transparent electrodes in solar cells.

Nanocrystalline Thin Films TiO2 Prepared by Different Concentration of Organic Acid and their Photocatalytic Activity

2011 ◽  
Vol 233-235 ◽  
pp. 363-368
Author(s):  
Nitikarn Fangern ◽  
Sudjit Sanguanruang ◽  
Chamorn Chawengkijwanich
Keyword(s):  
Thin Films ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dip Coating ◽  
Bet Surface Area ◽  
Glass Substrates ◽  
Vis Spectroscopy ◽  
Coating Method ◽  
Dip Coating Method

In this work, TiO2thin films were deposited on borosilicate glass substrates by sol-gel dip coating method and calcined at 500 °C for 15 min(heating rate3°C/min). The TiO2sol was prepared by fixing concentration of titaniumtetraisopropoxide(TTIP), TritonX-100 surfactant, ethanol and conc hydrochloric acid but amounts of acetyl acetone (Acac ) were various as 4, 6 and 8 mole respectively. After calcination process, all the TiO2thin films were homogeneous and transparent. Several techniques , such as X-ray diffraction (XRD), UV-Vis spectroscopy, Environment Scanning Electron Microscope (E-SEM), atomic force microscopy (AFM) and BET surface area analysis were used to characterize the prepared TiO2thin film. Spectra of XRD showed that the crystal structure was anatase phase with the crystal sizes of 9.05 – 12.57 nm. According to BET surface area analysis, the surface area , pore volume and pore size of TiO2were in the range of 66.35-82.53 m2/gm , 0.1194-0.1301 cm3/g and 57-71 A0respectively. The photodegradation of Reactive Blue 19 by the prepared TiO2thin films showed decomposition rate of 97.58% , 95.03 % and 94.48% for the thin films prepared by using 4, 6 and 8 mole AcAc respectively.

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.

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.

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
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