Discussion of the master's thesis of the student

Discussion of the master's thesis of the student " Buthaina Muhammad Abd"

The public discussion took place for the master’s student (Buthaina Muhammad Abd) Department of Physics- College of Science - University of Anbar on Monday, July 7, 2025, in Jabir ibn Hayyan Hall. for his tagged thesis

" Role of Metal Oxides on the structural, Optical and Electrical Properties of polymeric Blend composites."

The discussion committee consisted of:

University of Anbar - College of Sciences - President

Prof. Dr. Jamal Malallah Razij

University of Anbar - College of Sciences - Member

Assist. Prof. Dr. Qais Abdullah Abbas

University of Fallujah - Center for Biotechnology and Environmental Sciences - Member

Assist. Prof. Dr. Muhammad Abdul Malik Abdul Rahman

University of Anbar - College of Sciences - member and supervisor

Prof. Dr. Muhammad Ghazi Hamad

In this study, the structural and surface morphology of polymeric nanocomposite samples consisting of PVA and PANI, both individually and as blends, and the doping of these systems with CuO and Fe?O? nanoparticles individually or as hybrids, were analyzed. X-ray diffraction (XRD) analysis reveals the crystalline properties of both polymers and nanocomposites. The analysis is complemented by FTIR spectroscopy, which highlights changes in chemical bonding. The intensity of the -OH group in PVA decreases when mixed with PANI, and new oscillations appear, confirming interactions between the functional groups of the two polymers, with an additional effect when nanoparticles are introduced, indicating a modification of internal bonds and interactions. The surface properties of the prepared nanocomposite films were also evaluated using atomic force microscopy (AFM). Measurements showed significant changes in surface roughness (RMS) with different nanoparticle ratios; the roughness values vary depending on the distribution and agglomeration of the particles within the polymer matrix, which in turn affects the electrical and mechanical properties of the material. The optical and electrical properties of prepared nanocomposite films were investigated. By measuring the absorption spectrum in the UV-vis range. The Tauc relationship was used to determine the optical energy gap. Electrical conductivity (σ) showed an Arrhenius relationship behavior, where the conductivity increases with increasing temperature, indicating that the transport mechanisms depend on the thermal mobility of the carriers. As for the effect of nanoparticles on the Hall Effect, the results show an increase in carrier concentration when CuO or Fe?O? is introduced, noting that pure PVA and PANI show N-type (negative) conductivity.

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