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العنوان
Physical characteristics of nanostructure TiO2./
الناشر
جامعة عين شمس . كلية التربية . قسم الفيزياء .
المؤلف
سيد ، حنان سيد محمد .
هيئة الاعداد
باحث / حنان سيد محمد سيد.
مشرف / فخرى عبد السلام ابراهيم
مشرف / مصطفي محمد مصطفي حسين
مناقش / رضوان حمودة ندا
مناقش / ايمان فتحي مرسي علي
تاريخ النشر
1/1/2016
عدد الصفحات
169 ص ،
اللغة
الإنجليزية
الدرجة
الدكتوراه
التخصص
الفيزياء الذرية والجزيئية ، وعلم البصريات
تاريخ الإجازة
1/1/2016
مكان الإجازة
جامعة عين شمس - كلية التربية - قسم الفيزياء
الفهرس
Only 14 pages are availabe for public view

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Abstract

I. Structure identification of TiO2 powder and thin film forms including:
a)Thermogravimetric Analysis, TGA/DTG, and Differential Scanning Calorimetry DSC of TiO2 in powder form.
b)Infrared spectra investigation (FT-IR) of TiO2 powder and as deposited thin film samples.
c)High- Resolution Transmission Electron Microscope (HR-TEM) and Energy dispersive X- ray analysis (EDX) for powder and as deposited thin film samples.
d)X-ray diffraction studies of TiO2 in powder and thin film samples.
e)The Field Emission- Scanning electron microscope (FESEM) for TiO2 thin films with annealing temperature 473, 673, and 873K.
II. Mechanical properties of TiO2 powder and thin film forms including:
a)Determination of hardness values for TiO2 nano-powder pellet with different dwell time, and by analysis this results obtain the creep constant k and the stress exponent m.
b)Determination of the true film hardness HVf for TiO2 films by using the microhardnes measurements of TiO2 thin films deposited on soda lime glass substrate This is attained by analyzing the hardness data to a mathematical model to avoid the effect of substrate on the film properties.
c)Modeling Micro-hardeness for Nano-crystalline TiO2 Anatase thin film.
III. Optical properties of TiO2 thin films including:
a)Determination of transmittance and reflectance spectra of as deposited and annealed nanocrystalline anataseTiO2 films.
b)Determination of Optical constants (refractive index n, absorption index K, and absorption coefficient ) of the as deposited and annealed TiO2 films.
c)Analysis of these constants to obtain:
i)The allowed optical transition.
ii)The value of optical energy gap of as deposited and annealed nanocrystalline anataseTiO2 films.
iii)Determination of optical dispersion parameters the effective oscillation energy Eo, The dispersion energy Ed, dielectric constant at infinite frequency,∞, and the carrier concentration to the effective mass N/m*.
VI. Dc electrical conductivity of TiO2 thin films including:
a)The film thickness dependence of Dark electrical resistivity f, and the thermal activation energy of the free charge carriers E , for as deposited TiO2 thin films.
b)The temperature dependence of the dc conductivity, and dc electrical conduction activation energy Ea of TiO2 thin films.
c)Analysis the conduction mechanism to obtain the values of The impurity concentrations ND, The values of energy of the trapping states, Et , and density of the trapping states Nt.