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Najiba Abdullah Hassan
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THE INFLUENCE OF THICKNESS ON THE STRUCTURAL AND OPTICAL PROPERTIES OF ZNO:IN THIN FILMS Hassan, Najiba Abdullah; Hazaa, Salah Qaduri; Abbas, Abbas Ali
MAGISTRA Vol 25, No 85 (2013): Magistra September
Publisher : MAGISTRA

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Abstract

Indium doped zinc oxide (IZO) thin films were prepared by DC- magnetron sputtering technique on glass at ambient substrates temperature with different thickness. The effect of thickness of films on the structure and optical properties of the films was investigated. The crystal structure and orientation of the films were studded by XRD pattern. All the deposited films are polycrystalline and the dependence of preferred orientation, peak intensities and grain size on the film’s thicknesses are investigated. The optical absorbance and transmittance through the films was measured spectrophotometrically in the wavelength range 350-900 nm. The absorption coefficient, optical energy gap, Urbach energy, optical constants ( refractive index, extinction coefficient, dielectric constant) and dispersion parameters, such as single-oscillator energy, dispersive energy were determined with different thickness of films and analyzed. Keywords: ZnO:In, Sputtering, Crystal structure, Optical properties
EFFECT OF MULTI WALLED CARBON NANOTUBES ADDITION ON THE MECHANICAL AND THERMAL PROPERTIES OF EPOXY MATRICES Hassan, Najiba Abdullah; Al Kabi, Jamal Jasim Rady
MAGISTRA Vol 26, No 94 (2015): Magistra Desember
Publisher : MAGISTRA

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Abstract

This study focuses on development and characterization of thermosetting resin (epoxy resin) based nanocomposites containing multi walled carbon nanotubes (MWCNTs). CNTs­ epoxy composites have been fabricated using solution processing with different volume fraction Vf % of CNTs. Three bending test, Vicker’s hardness and thermal conductivity tests were performed on unfilled and CNT­filled epoxy to identify the loading on the properties of materials. Mechanical test results showed that epoxy resin and CNTs/epoxy composites behavior as ductile material ,and the results showed that the flexural properties were inferior to those exhibited by the pure epoxy matrix. While microhardness testing showed improve the hardness of composites. The thermal properties of neat epoxy resin and multi wall carbon nanotube (MWCNTs) / epoxy composites were measured by Lee’s disc technique. The experimental results show were slightly enhanced of thermal conductivity (as compared to the neat) with increasing volume fraction of CNTs. Keyword : Multi walled carbon nanotube, epoxy matrices
Co-Authors Abbas Ali Abbas Jamal Jasim Rady Al Kabi, Jamal Jasim Rady Salah Qaduri Hazaa