أ. محمدحمزه

قسم الفيزياء كلية العلوم

الاسم الكامل

أ. محمد ابوبكر عمر حمزه

المؤهل العلمي

ماجستير

الدرجة العلمية

محاضر

ملخص

محمد هو احد اعضاء هيئة التدريس بقسم الفيزياء بكلية العلوم. يعمل السيد محمد بجامعة طرابلس كـمحاضر منذ 2018-06-01 وله العديد من المنشورات العلمية في مجال تخصصه

تنزيل السيرة الذاتية

معلومات الاتصال

روابط التواصل

الاستشهادات

الكل منذ 2017
الإقتباسات
h-index
i10-index

المؤهلات

ماجستير

الفيزياء
كلية العلوم . جامعة طرابلس
7 ,2013

بكالوريوس

الفيزياء
كلية التربية . جامعة طرابلس
7 ,1998

المنشورات

OPTICAL PARAMETERS OF POLYVINYL ALCOHOL-MOLYBDENUM OXIDE COMPOSITE FILMS

Polyvinyl alcohol-molybdenum oxide (PVA-MoO3) composite films were prepared by solution casting technique. The weight percentages of the oxide in the films were 2.5% and 5%. The films were characterized by using a computerized double beam UV-VIS spectrophotometer. Optical parameters of the composite films such as real (n) and imaginary (k) parts of refractive index, optical conductivity and dielectric constant were calculated. Other optical parameters (the oscillator energy (E0) and dispersion energy (Ed)) have been also evaluated. The obtained results revealed that doping of MoO3 had a significant effect on the optical properties. The results showed that the increased ratio of the oxide led to an increase in the calculated values of the PVA film parameters and shifted toward high wavelength. The addition of 5.0% of MoO3 to PVA film raised the refractive index (n) value by 38.5%. The Results of this study show that the PVA-MoO3 film can have many applications, especially in the area of antireflective coating and photonic devices.
Mohamed Hamza, Abduelmajid Najjar(10-2018)
full text Publisher's website


Study of MoO3 doping effect on linear and Non-linear optical properties of Cellulose acetate (CA) films

The goal of this study was to investigate the optical properties of the prepared CA-MoO3 nanocomposites films. CA has been chosen as a host matrix and then doped with MoO3 with different concentrations (2.5, 5, 10 and 15wt. %) of MoO3 by using casting procedure. CA-MoO3 films were characterized by UV-Visible spectrophotometer within the wavelength range of 200 nm-800 nm. The Linear optical parameters (transmission (T), extinction coefficient (K), reflectance (R), refractive index (n), real (ε1) and imaginary (ε2) part of the dielectric constant and optical conductivity (σopt)) of CA-MoO3 films were obtained from absorption spectra. The volume (VELF) and surface (SELF) energy loss function of CAMoO3 films were obtained by complex dielectric constant. The Dispersion parameters (dispersion energy (Ed), oscillation energy (E0), static dielectric constant (ε0) and static refractive index (n0)) were calculated using theoretical Wemple-DiDomenico model. The nonlinear optical susceptibility x(1), x(3) and nonlinear refractive index n2 were evaluated from the linear optical parameters using semiempirical relation. The results show that the Linear and nonlinear optical parameters change with the increase of molybdenum trioxide concentration, where, the transmittance, oscillator energy, the volume (VELF) and surface (SELF) energy loss decreases with the increase of MoO3 concentration.
Mohamed Abu. Hamza, Saad E. Sharada(8-2022)
full text Publisher's website


Effect of UV irradiation on linear optical parameters of PVA-MoO3 Film

A sample of polyvinyl alcohol doped with 5% by weight of molybdenum oxide forming (PVA-MoO3) composite film was prepared using the solution casting technique. The film was exposed to UV irradiation (366nm wavelength) for different periods of time ranging from 5 to 60 min (5, 10, 20, 30, 40, 50 and 60 min) at room temperature. A computerized double beam UV-VIS spectrophotometer was used to characterize the sample film. The linear optical parameters such as (n) and (k) real and imaginary parts of refractive index, optical conductivity and dielectric constant were calculated. Also, the oscillator energy and dispersion energy (E0, Ed) were evaluated. The experimental results showed that the extinction coefficient (K), reflectance (R), refractive index (n), dispersion energy (Ed), real (ε1) and imaginary (ε2) parts of dielectric constants and optical conductivity (σop) are increased, where, the transmittance (T) and oscillator energy (E0) decreases with the increase of the exposure radiation time. Also, the results showed that (PVA-MoO3) composite film can be used as UV sensor.
Mohamed Abu. Hamza, Saad E. Sharada(8-2022)
full text Publisher's website


دراسة بعض الخصائص البصرية لأفلام بولي فينيل الكحول ( PVA) المشوبة بيوديد الصوديوم (NaI)

في هذا البحث سيتم دراسة الخصائص البصرية لأغشية بولي فينايل الكحول الغير مشوبة و المشوبة بيوديد الصوديوم و بنسب وزنية ( 5%,15% ( بإستخدام جهاز التحليل الطيفي و في مدى أطوال موجية nm ( 320-800 ( ، ودراسة مدى تغير الا متصاصية بزيادة نسبة التشويب وحساب فجوة الطاقة البصرية لكل من الإنتقال المباشر و الغير مباشر بإستخدام معادلة Tauc .
محمد ابوبكر حمزه, منال الصيد عثمان(4-2022)
عرض موقع المنشور