Elaboration et caractérisation de nanocomposites hybrides: Oxydes métalliques/polymères

الموضوعات

علوم بحتة وطبيعية

روابط وملفات

التعريف والنوع

رقم الوثيقة

0bdef1b7-f741-40f9-b36e-94a6fc65978a

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

790894_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":" Ouahiba Halimi","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Bariza Troudi","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

French

المصدر والدورية

اسم المصدر

Elaboration et caractérisation de nanocomposites hybrides: Oxydes métalliques/polymères

المحتوى والصفحات

عدد الصفحات

0

ترجمة الملخص

Thin films of metal oxides/polymers nanocomposites were deposited on glass substratesby Spin-Coating and Dip-Coating techniques. The nanocomposites were elaborated by inserting,in the matrices of polystyrene (PS) and polyvinyl chloride (PVC) polymers, of nanoparticles ofmetal oxides such as copper oxide (CuO) and lead oxide (PbO). The nanoparticles ofsemiconductor CuO and PbO were synthesized beforehand by the hydrothermal method. The xray diffraction characterization of the obtained powders have revealed a monoclinic phase forCuO crystallites and an orthorhombic phase for PbO. The size of the crystallites of the twosemiconductors is of a nanometic order. Calcul the of gap energy indicate a shift towards highenergies compared to massive crystals. This shift is due to the effect of the quantum confinementinduced by the nanometric size of the crystallites of the semiconductors. These nanocrystals areused for the preparation of the nanocomposites of CuO/PS, CuO/PVC, PbO/PS and PbO/PVC bysimple insertion of CuO and PbO nanoparticles in the PS and PVC polymers. The analysis of theelaborated nanocomposites by X-ray diffraction has allowed to notice the incorporation of theCuO and PbO crystallites into the PS and PVC polymers matrixes and analysis by Raman andinfrared spectroscopies has confirmed the presence of CuO and PbO crystallites in the PS andPVC matrixes by revealing specific vibration modes to the Cu-O and Pb-O bonds. The surfacemorphology and topography of thin films of nanocomposites were highlighted with the help ofatomic force microscopy (AFM) and have shown homogeneous dispersion of CuO and PbOcrystallites and a low surface roughness. the characterization by measurement of the opticalabsorption in the UV-Visible domain allows to observe the increase in optical absorption whichis attributed to CuO and PbO nanocrystallites because PS and PVC are optically transparent inthe UV-Visible domain. A shift of the gap energy of the nanocomposites compared with the gapenergy of the pure polymers and the massive crystallites of CuO and PbO was observed. Thisvariation in gap energy is the result of the new optical behavior of the prepared nanocomposites.The optical characterization by the measure of the photoluminescence has shown that theelaborated samples present intense luminescence bands in the visible range, hence the possibilityof consider these matrices as optically active media and can be used for the making devices ofspecific optics properties.

إشراف وإعداد

الإشراف

Ouahiba Halimi

الإعداد

Bariza Troudi

الاقتباسات الببليوغرافية