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Your search keyword '"Saleh, Hisham A"' showing total 39 results
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39 results on '"Saleh, Hisham A"'

8. Exploring the optical and electrical characteristics of CuO/CuCo2O4 composites

Author

Deraz Nasrallah M., Saleh Hisham A., and Abdel-Karim Amal M.

Subjects
cuo/cuco2o4 composite, optical properties, conductivity, dielectric constant, semiconductor, Chemical technology, TP1-1185
Abstract

Series of CuO/CuCo2O4 composites were prepared by using the combustion method followed by heating at 750oC with different molar ratios of Cu/Co. Characterization of different composites is systematically investigated with various analytical techniques. X-ray diffraction patterns and Fourier-transform infrared spectroscopy indicate the growth of well crystalline CuCo2O4 nanoparticles with a cubic spinel structure. Images of transmission electron microscope and scanning electron microscope show a uniform particle distribution. From UV-visible spectra, the calculated optical band gaps of various solids were ranged between 1.2 and 1.8 eV. Electrical properties were measured at temperature ranged from 303 to 463 K in a frequency range from 102 to 106 Hz. The AC conductivity satisfied the Jonscher equation, especially at high frequency. The obtained data of conductivity and dielectric constant indicated that the prepared samples behave as semiconductor materials. Finally, it can be concluded that the CuO/CuCo2O4 composite showed attractive multi-functional features for electrical applications.

Published
2022
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29. Exploring the Optical and Electrical Characteristics of CuO/CuCo2O4 Composites.

Author

Deraz, Nasrallah M., Saleh, Hisham A., and Abdel-karim, Amal M.

Subjects
BAND gaps, TRANSMISSION electron microscopes, SEMICONDUCTOR materials, PERMITTIVITY, IMAGE transmission
Abstract

Series of CuO/CuCo2O4 composites were prepared by using the combustion method followed by heating at 750oC with different molar ratios of Cu/Co. Characterization of different composites is systematically investigated with various analytical techniques. X-ray diffraction patterns and Fourier-transform infrared spectroscopy indicate the growth of well crystalline CuCo2O4 nanoparticles with a cubic spinel structure. Images of transmission electron microscope and scanning electron microscope show a uniform particle distribution. From UV-visible spectra, the calculated optical band gaps of various solids were ranged between 1.2 and 1.8 eV. Electrical properties were measured at temperature ranged from 303 to 463 K in a frequency range from 102 to 106 Hz. The AC conductivity satisfied the Jonscher equation, especially at high frequency. The obtained data of conductivity and dielectric constant indicated that the prepared samples behave as semiconductor materials. Finally, it can be concluded that the CuO/CuCo2O4 composite showed attractive multi-functional features for electrical applications. [ABSTRACT FROM AUTHOR]

Published
2022
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37. Synthesis and Optical Characterization of Novel Chemically-Deposited AgCrO2Thin Films at Low Temperature

Author

Saleh, Hisham A., Dahy, T. M., and Deraz, Nasrallah M.

Abstract

At a low temperature of 50 oC, the chemical bath deposition approach was effectively utilized to deposit delafossite AgCrO2thin films. The deposited films are naturally crystalline, according to X-ray diffraction analysis (XRD). The observed reflection planes were indexed to a Rhombohedral crystal structure of the space group R3¯m.Transmission electron microscopy (TEM) and related chosen area electron diffraction patterns were used to confirm the crystalline nature of the deposited films. The structural investigation of the as-prepared films indicated that the anticipated particle size increases as deposition time increases. The optical reflection and transmission spectra were spectrophotometrically calculated in the 300–2500 nm wavelength range. The fluctuation of the optical band gap energy, Eg, Refractive index, n, and the associated dispersion parameters, for instance oscillator energy, Eo, and dispersion energy Ed, as a function of deposition time, were studied. In addition, the non-linear refractive index n was calculated.

Published
2023
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