Saad Oboudi - Academia.edu (original) (raw)

Papers by Saad Oboudi

Materials Science: An Indian Journal, 2014

SnO 2 thin films; Electrical properties; Spray pyrolysis technique.

Advances in Nanoparticles, 2016

The growth of epitaxial Ag nanoparticles doped (Bi, Pb)-2223 thin films on Si (111) substrates by... more The growth of epitaxial Ag nanoparticles doped (Bi, Pb)-2223 thin films on Si (111) substrates by pulsed laser deposition (PLD) and post-deposition oxygen annealing have been achieved. The phase identification and gross structural characteristics of synthesized films explored through X-ray diffractometer reveal that all the samples crystallize in orthorhombic structure. DC electrical resistivity measurements were done by the standard four-probe method and the results showed improvement in T c by increasing Ag nanoparticles to 1.0 wt% which had a maximum enhancement in T c for all investigated films. The surface morphology investigated through scanning electron microscope (SEM) and atomic force microscopy (AFM) results showed that an increase in T c with the appropriate Ag nanoparticles addition in the samples is associated with the enhancement of Bi (Pb)-2223 phase formation.

Diyala Journal for Pure Science, 2011

Poly(vinyl alcohol) doped Ag films with different thicknesses were prepared by casting method. Th... more Poly(vinyl alcohol) doped Ag films with different thicknesses were prepared by casting method. The thickness of the prepared films were 10, 20, 30,and 40 µm. Transmission and absorption spectra have been recorded in order to study the effect of increasing thickness on some optical constants such as transmittance, reflectance, absorption coefficient, refractive index, extinction coefficient, and real and imaginary parts of dielectric constant. This study reveals that all these parameters affect by increasing the thickness.

Iraqi Journal of Physics, 2014

The characterization of ZnO and ZnO:In thin films were confirmed by spray pyrolysis technique. Th... more The characterization of ZnO and ZnO:In thin films were confirmed by spray pyrolysis technique. The films were deposited onto glass substrate at a temperature of 450°C. Optical absorption measurements were also studied by UV-VIS technique in the wavelength range 300-900 nm which was used to calculate the optical constants. The changes in dispersion and Urbach parameters were investigated as a function of In content. The optical energy gap was decreased and the wide band tails were increased in width from 616 to 844 eV as the In content increased from 0wt.% to 3wt.%. The single–oscillator parameters were determined also the change in dispersion was investigated before and after doping

Physical Chemistry: An Indian Journal, 2013

ABSTRACT We report the conducting and transparent CdS films fabricated by the chemical spray pyro... more ABSTRACT We report the conducting and transparent CdS films fabricated by the chemical spray pyrolysis technique (CSPT). The effect of gamma irradiation on the optical properties and dispersion parameters has been studied. The samples were subjected to a session of irradiation with gamma ray form Cs-137 (0.5 µCi) for 5 days. Optical absorption measurements were also studied by UV-VIS technique in the wavelength ranges 300-900 nm. The fundamental and onset energy gap amount for unirradiated and irradiatedCdS filmswere 2.43±0.01 eV and 2.41±0.01 eV respectively. The changes in dispersion parameters and Urbach tails were investigated. A slight decrease in the average oscillator strength was obtained after irradiation. The single–oscillator parameters were determined. 2013 Trade Science Inc. - INDIA

International Journal of Thin Films Science and Technology (Online), Sep 1, 2013

International Letters of Chemistry, Physics and Astronomy, Sep 1, 2013

Uniform and adherent Zn 1-x Mn x O films have been deposited by using spray pyrolysis technique o... more Uniform and adherent Zn 1-x Mn x O films have been deposited by using spray pyrolysis technique on glass substrates. The optical properties and dispersion parameters of zinc oxide have been studied as a function of doping concentration with Mn. Changes in direct optical energy band gap of cobalt oxide films were confirmed after doping, The optical energy gap Eg increased from 3.13 eV for the undoped ZnO to 3.39 eV with increasing the doping concentration of Mn to 4 %. The changes in dispersion parameters and Urbach tails were investigated. An increase in the doping concentration causes a decrease in the average oscillator strength. The single-oscillator parameter has been reported.

International Letters of Chemistry, Physics and Astronomy, May 3, 2013

Thin films of ZnO 0.7 NiO 0.3 have deposited on glass substrates at room temperature by using the... more Thin films of ZnO 0.7 NiO 0.3 have deposited on glass substrates at room temperature by using thermal evaporation technique under vacuum 10-5 mbar. The optical properties and dispersion parameters of the films have been studied. Changes in direct optical energy band gap of films were confirmed before and after annealing. The optical energy gap E g decreased from 3.11 to 2.86 eV with increasing of annealing temperature to 200 ºC. Some of the optical absorption parameters, such as optical dispersion energies E o and E d , Urbach tails E U , dielectric constant ε, the average values of oscillator strength S o , and wavelength of single oscillator λ o have been reported. An increase in the annealing temperature causes an increase in the average oscillator strength from 62.02 to 87.71 eV.

Diyala Journal for Pure Science, 2013

Physical Chemistry: An Indian Journal, 2014

SnO 2 thin films; Electrical properties; Spray pyrolysis technique.

Acta Physica Polonica A, Apr 1, 2019

This work was performed to investigate the effect of Li substitution on the dielectric properties... more This work was performed to investigate the effect of Li substitution on the dielectric properties of Bi2−xLixPb0.3Sr2Ca2Cu3Oy compound with x = 0, 0.1, and 0.3. The samples were prepared by using a solid state reaction method. X-ray diffraction analysis showed an orthorhombic structure for all the samples. The dielectric properties for the samples such as AC conductivity, dielectric constant, and loss of factor as a function of frequency in a range (1000 Hz-5 MHz) were determined. The values of AC conductivity remained constant till a certain value of frequencies, and then increased at higher frequencies. The dielectric constants and the dielectric loss of the samples were found to be strongly dependent on the frequency of the applied field, as well as on the Li concentration.

Materials Science: An Indian Journal, 2014

SnO 2 films with different thicknesses (250, 300, 330 and 350 nm) were synthesized by spray pyrol... more SnO 2 films with different thicknesses (250, 300, 330 and 350 nm) were synthesized by spray pyrolysis technique. The substrates were heated to 500°C. Characteristics and optical constant of the films have been studied. Optical absorption studies in the wavelength range 300-900 nm in order to calculate the optical constants such as refractive index, extinction coefficient, real and imaginary parts of dielectric constant. Results illustrate that both refractive index and extinction coefficient of the films are increasing with increasing film thickness, on the other hand, the values of real and imaginary parts of the dielectric are found to be decreased with increasing film thickness. The skin depth is found to be decreases as the film thickness increased to 350nm, so the skin depth is a transmittance related.

We report the transparent conducting mixed SnO2-CuO oxides films fabricated by chemical spray pyr... more We report the transparent conducting mixed SnO2-CuO oxides films fabricated by chemical spray pyrolysis technique (CSPT). The effects of the film thickness on the optical absorptance of the TCO films are assessed. Optical absorption measurements were studied by UV-VIS technique in the wavelength ranges 400-1100 nm. Characteristics and optical constants of the mixed oxides thin film such as refractive index, extinction coefficient, real and imaginary parts of dielectric constant have been studied. The optical conductivity and the skin depth are increased with increasing the film thickness.

Materials Focus, Feb 1, 2014

Materials Sciences and Applications, 2015

Investigating the Preparation Conditions on Superconducting Properties of Bi 2−x Li x Pb 0.3 Sr 2... more Investigating the Preparation Conditions on Superconducting Properties of Bi 2−x Li x Pb 0.3 Sr 2 Ca 2 Cu 3 O 10+δ. Materials Sciences and Applications, 6, 310-321.

Advances in Nanoparticles, Feb 1, 2016

The growth of epitaxial Ag nanoparticles doped (Bi, Pb)-2223 thin films on Si (111) substrates by... more The growth of epitaxial Ag nanoparticles doped (Bi, Pb)-2223 thin films on Si (111) substrates by pulsed laser deposition (PLD) and post-deposition oxygen annealing have been achieved. The phase identification and gross structural characteristics of synthesized films explored through X-ray diffractometer reveal that all the samples crystallize in orthorhombic structure. DC electrical resistivity measurements were done by the standard four-probe method and the results showed improvement in T c by increasing Ag nanoparticles to 1.0 wt% which had a maximum enhancement in T c for all investigated films. The surface morphology investigated through scanning electron microscope (SEM) and atomic force microscopy (AFM) results showed that an increase in T c with the appropriate Ag nanoparticles addition in the samples is associated with the enhancement of Bi (Pb)-2223 phase formation.

Journal of University of Anbar for Pure Science

Co 2 O 3 and Co 2 O 3(1-x) :Cu x films have been deposited by using spray pyrolysis technique on ... more Co 2 O 3 and Co 2 O 3(1-x) :Cu x films have been deposited by using spray pyrolysis technique on a glass substrates. The optical properties of the cobalt oxide have been studied as a function of doping concentration with Cu. Changes in direct optical band gap energy of cobalt oxide films were confirmed after doping, Eg increased from 1.48 and 1.95 eV for the undoped Co 2 O 3 to 1.55 and 2.05 eV with increasing the doping concentration to 5%. The effect of doping on the optical parameters of Co 2 O 3 thin films such as transmittance, reflectance, absorption coefficient, refractive index, extinction coefficient, and real and imaginary parts of dielectric constant has been reported.

In this investigation, TiO2 thin films were synthesized by vacuum evaporation technique on glass ... more In this investigation, TiO2 thin films were synthesized by vacuum evaporation technique on glass substrates at room temperature. The films were then annealed at 200 and 250ºC in air for a period of 1 hour. The optical characterizations of the as deposited and annealed films were carried out using UV–VIS transmittance spectroscopy in the wavelength range 300– 900 nm in order to calculate the optical constants such as refractive index, extinction coefficient, real and imaginary parts of dielectric constant. Results illustrate that refractive index, extinction coefficient, both the real and imaginary parts of dielectric constant and the optical conductivity of the films are increasing with increasing annealing temperature, on the other hand, the value of the skin depth is found to be decreases as the annealing temperature increased to 250ºC, so the skin depth is a transmittance related. 2014 Trade Science Inc. - INDIA

Composites Part B: Engineering, 2012

ABSTRACT

SnO 2 thin films were synthesized by spray pyrolysis technique on glass substrates preheated to 5... more SnO 2 thin films were synthesized by spray pyrolysis technique on glass substrates preheated to 500ºC. The films were annealed at 550ºC in air for periods of 1, 2, and 3 hrs. The optical characterizations of the as deposited and annealed films were carried out using UV-Vis transmittance spectros-copy in the wavelength range 300-900 nm. The results show that in the visible region the transmittance of the films increases as the annealing time increases to 3 hrs, while the reverse is the case with the reflectance. The results also show that the absorption coefficient and the skin depth were tending to decrease with increasing annealing time, on the other hand the refractive index, extinction coefficient, real and imaginary parts of dielectric constant decreases with increasing annealing time. In the visible region the refractive index values were varied between 3.2-3.6.

Materials Science: An Indian Journal, 2014

SnO 2 thin films; Electrical properties; Spray pyrolysis technique.

Advances in Nanoparticles, 2016

The growth of epitaxial Ag nanoparticles doped (Bi, Pb)-2223 thin films on Si (111) substrates by... more The growth of epitaxial Ag nanoparticles doped (Bi, Pb)-2223 thin films on Si (111) substrates by pulsed laser deposition (PLD) and post-deposition oxygen annealing have been achieved. The phase identification and gross structural characteristics of synthesized films explored through X-ray diffractometer reveal that all the samples crystallize in orthorhombic structure. DC electrical resistivity measurements were done by the standard four-probe method and the results showed improvement in T c by increasing Ag nanoparticles to 1.0 wt% which had a maximum enhancement in T c for all investigated films. The surface morphology investigated through scanning electron microscope (SEM) and atomic force microscopy (AFM) results showed that an increase in T c with the appropriate Ag nanoparticles addition in the samples is associated with the enhancement of Bi (Pb)-2223 phase formation.

Diyala Journal for Pure Science, 2011

Poly(vinyl alcohol) doped Ag films with different thicknesses were prepared by casting method. Th... more Poly(vinyl alcohol) doped Ag films with different thicknesses were prepared by casting method. The thickness of the prepared films were 10, 20, 30,and 40 µm. Transmission and absorption spectra have been recorded in order to study the effect of increasing thickness on some optical constants such as transmittance, reflectance, absorption coefficient, refractive index, extinction coefficient, and real and imaginary parts of dielectric constant. This study reveals that all these parameters affect by increasing the thickness.

Iraqi Journal of Physics, 2014

The characterization of ZnO and ZnO:In thin films were confirmed by spray pyrolysis technique. Th... more The characterization of ZnO and ZnO:In thin films were confirmed by spray pyrolysis technique. The films were deposited onto glass substrate at a temperature of 450°C. Optical absorption measurements were also studied by UV-VIS technique in the wavelength range 300-900 nm which was used to calculate the optical constants. The changes in dispersion and Urbach parameters were investigated as a function of In content. The optical energy gap was decreased and the wide band tails were increased in width from 616 to 844 eV as the In content increased from 0wt.% to 3wt.%. The single–oscillator parameters were determined also the change in dispersion was investigated before and after doping

Physical Chemistry: An Indian Journal, 2013

ABSTRACT We report the conducting and transparent CdS films fabricated by the chemical spray pyro... more ABSTRACT We report the conducting and transparent CdS films fabricated by the chemical spray pyrolysis technique (CSPT). The effect of gamma irradiation on the optical properties and dispersion parameters has been studied. The samples were subjected to a session of irradiation with gamma ray form Cs-137 (0.5 µCi) for 5 days. Optical absorption measurements were also studied by UV-VIS technique in the wavelength ranges 300-900 nm. The fundamental and onset energy gap amount for unirradiated and irradiatedCdS filmswere 2.43±0.01 eV and 2.41±0.01 eV respectively. The changes in dispersion parameters and Urbach tails were investigated. A slight decrease in the average oscillator strength was obtained after irradiation. The single–oscillator parameters were determined. 2013 Trade Science Inc. - INDIA

International Journal of Thin Films Science and Technology (Online), Sep 1, 2013

International Letters of Chemistry, Physics and Astronomy, Sep 1, 2013

Uniform and adherent Zn 1-x Mn x O films have been deposited by using spray pyrolysis technique o... more Uniform and adherent Zn 1-x Mn x O films have been deposited by using spray pyrolysis technique on glass substrates. The optical properties and dispersion parameters of zinc oxide have been studied as a function of doping concentration with Mn. Changes in direct optical energy band gap of cobalt oxide films were confirmed after doping, The optical energy gap Eg increased from 3.13 eV for the undoped ZnO to 3.39 eV with increasing the doping concentration of Mn to 4 %. The changes in dispersion parameters and Urbach tails were investigated. An increase in the doping concentration causes a decrease in the average oscillator strength. The single-oscillator parameter has been reported.

International Letters of Chemistry, Physics and Astronomy, May 3, 2013

Thin films of ZnO 0.7 NiO 0.3 have deposited on glass substrates at room temperature by using the... more Thin films of ZnO 0.7 NiO 0.3 have deposited on glass substrates at room temperature by using thermal evaporation technique under vacuum 10-5 mbar. The optical properties and dispersion parameters of the films have been studied. Changes in direct optical energy band gap of films were confirmed before and after annealing. The optical energy gap E g decreased from 3.11 to 2.86 eV with increasing of annealing temperature to 200 ºC. Some of the optical absorption parameters, such as optical dispersion energies E o and E d , Urbach tails E U , dielectric constant ε, the average values of oscillator strength S o , and wavelength of single oscillator λ o have been reported. An increase in the annealing temperature causes an increase in the average oscillator strength from 62.02 to 87.71 eV.

Diyala Journal for Pure Science, 2013

Physical Chemistry: An Indian Journal, 2014

SnO 2 thin films; Electrical properties; Spray pyrolysis technique.

Acta Physica Polonica A, Apr 1, 2019

This work was performed to investigate the effect of Li substitution on the dielectric properties... more This work was performed to investigate the effect of Li substitution on the dielectric properties of Bi2−xLixPb0.3Sr2Ca2Cu3Oy compound with x = 0, 0.1, and 0.3. The samples were prepared by using a solid state reaction method. X-ray diffraction analysis showed an orthorhombic structure for all the samples. The dielectric properties for the samples such as AC conductivity, dielectric constant, and loss of factor as a function of frequency in a range (1000 Hz-5 MHz) were determined. The values of AC conductivity remained constant till a certain value of frequencies, and then increased at higher frequencies. The dielectric constants and the dielectric loss of the samples were found to be strongly dependent on the frequency of the applied field, as well as on the Li concentration.

Materials Science: An Indian Journal, 2014

SnO 2 films with different thicknesses (250, 300, 330 and 350 nm) were synthesized by spray pyrol... more SnO 2 films with different thicknesses (250, 300, 330 and 350 nm) were synthesized by spray pyrolysis technique. The substrates were heated to 500°C. Characteristics and optical constant of the films have been studied. Optical absorption studies in the wavelength range 300-900 nm in order to calculate the optical constants such as refractive index, extinction coefficient, real and imaginary parts of dielectric constant. Results illustrate that both refractive index and extinction coefficient of the films are increasing with increasing film thickness, on the other hand, the values of real and imaginary parts of the dielectric are found to be decreased with increasing film thickness. The skin depth is found to be decreases as the film thickness increased to 350nm, so the skin depth is a transmittance related.

We report the transparent conducting mixed SnO2-CuO oxides films fabricated by chemical spray pyr... more We report the transparent conducting mixed SnO2-CuO oxides films fabricated by chemical spray pyrolysis technique (CSPT). The effects of the film thickness on the optical absorptance of the TCO films are assessed. Optical absorption measurements were studied by UV-VIS technique in the wavelength ranges 400-1100 nm. Characteristics and optical constants of the mixed oxides thin film such as refractive index, extinction coefficient, real and imaginary parts of dielectric constant have been studied. The optical conductivity and the skin depth are increased with increasing the film thickness.

Materials Focus, Feb 1, 2014

Materials Sciences and Applications, 2015

Investigating the Preparation Conditions on Superconducting Properties of Bi 2−x Li x Pb 0.3 Sr 2... more Investigating the Preparation Conditions on Superconducting Properties of Bi 2−x Li x Pb 0.3 Sr 2 Ca 2 Cu 3 O 10+δ. Materials Sciences and Applications, 6, 310-321.

Advances in Nanoparticles, Feb 1, 2016

The growth of epitaxial Ag nanoparticles doped (Bi, Pb)-2223 thin films on Si (111) substrates by... more The growth of epitaxial Ag nanoparticles doped (Bi, Pb)-2223 thin films on Si (111) substrates by pulsed laser deposition (PLD) and post-deposition oxygen annealing have been achieved. The phase identification and gross structural characteristics of synthesized films explored through X-ray diffractometer reveal that all the samples crystallize in orthorhombic structure. DC electrical resistivity measurements were done by the standard four-probe method and the results showed improvement in T c by increasing Ag nanoparticles to 1.0 wt% which had a maximum enhancement in T c for all investigated films. The surface morphology investigated through scanning electron microscope (SEM) and atomic force microscopy (AFM) results showed that an increase in T c with the appropriate Ag nanoparticles addition in the samples is associated with the enhancement of Bi (Pb)-2223 phase formation.

Journal of University of Anbar for Pure Science

Co 2 O 3 and Co 2 O 3(1-x) :Cu x films have been deposited by using spray pyrolysis technique on ... more Co 2 O 3 and Co 2 O 3(1-x) :Cu x films have been deposited by using spray pyrolysis technique on a glass substrates. The optical properties of the cobalt oxide have been studied as a function of doping concentration with Cu. Changes in direct optical band gap energy of cobalt oxide films were confirmed after doping, Eg increased from 1.48 and 1.95 eV for the undoped Co 2 O 3 to 1.55 and 2.05 eV with increasing the doping concentration to 5%. The effect of doping on the optical parameters of Co 2 O 3 thin films such as transmittance, reflectance, absorption coefficient, refractive index, extinction coefficient, and real and imaginary parts of dielectric constant has been reported.

In this investigation, TiO2 thin films were synthesized by vacuum evaporation technique on glass ... more In this investigation, TiO2 thin films were synthesized by vacuum evaporation technique on glass substrates at room temperature. The films were then annealed at 200 and 250ºC in air for a period of 1 hour. The optical characterizations of the as deposited and annealed films were carried out using UV–VIS transmittance spectroscopy in the wavelength range 300– 900 nm in order to calculate the optical constants such as refractive index, extinction coefficient, real and imaginary parts of dielectric constant. Results illustrate that refractive index, extinction coefficient, both the real and imaginary parts of dielectric constant and the optical conductivity of the films are increasing with increasing annealing temperature, on the other hand, the value of the skin depth is found to be decreases as the annealing temperature increased to 250ºC, so the skin depth is a transmittance related. 2014 Trade Science Inc. - INDIA

Composites Part B: Engineering, 2012

ABSTRACT

SnO 2 thin films were synthesized by spray pyrolysis technique on glass substrates preheated to 5... more SnO 2 thin films were synthesized by spray pyrolysis technique on glass substrates preheated to 500ºC. The films were annealed at 550ºC in air for periods of 1, 2, and 3 hrs. The optical characterizations of the as deposited and annealed films were carried out using UV-Vis transmittance spectros-copy in the wavelength range 300-900 nm. The results show that in the visible region the transmittance of the films increases as the annealing time increases to 3 hrs, while the reverse is the case with the reflectance. The results also show that the absorption coefficient and the skin depth were tending to decrease with increasing annealing time, on the other hand the refractive index, extinction coefficient, real and imaginary parts of dielectric constant decreases with increasing annealing time. In the visible region the refractive index values were varied between 3.2-3.6.