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Investigation of Linear Optical Parameters and Dielectric Properties of Polyvinyl Alcohol/ZnO Nanocomposite Films
Physica Status Solidi (A) - Applications and Materials Science ( IF 2 ) Pub Date : 2020-08-18 , DOI: 10.1002/pssa.202000321
Tarek S. Soliman 1, 2 , Ahmed M. Rashad 3, 4 , Ismail A. Ali 5 , Sabah I. Khater 6 , Shimaa I. Elkalashy 4, 5
Affiliation  

Herein, a detailed analysis of the dielectrical and optical properties of polyvinyl alcohol (PVA)–ZnO nanocomposite films is provided. The ZnO nanoparticles are prepared by the sol–gel process, whereas the nanocomposite films are prepared using the solution casting technique. The dispersion of the ZnO nanoparticles into the PVA matrix is analyzed with X‐ray diffraction and a scanning electron microscope. UV–visible spectroscopy is used to investigate the variation in the absorption of the polymer films, as the filler content in the polymer matrix changes. Linear optical parameters, such as the refractive index, extinction coefficient, and optical conductivity, are determined using the absorption and transmission data. The dielectric properties are evaluated with dielectrical and impedance spectroscopy techniques at a frequency range of 100 Hz–5 kHz and a temperature range of 310–360 K. The permittivity of the polymer films is found to increase, as ZnO nanoparticle concentration increases and the temperature rises. Low ZnO loading in the PVA matrix enhances the latter's optical and dielectric properties, which make it useful for optoelectronic applications.

中文翻译:

聚乙烯醇/ ZnO纳米复合薄膜的线性光学参数和介电性能的研究

在此,对聚乙烯醇(PVA)-ZnO纳米复合薄膜的介电和光学性能进行了详细分析。ZnO纳米颗粒是通过溶胶-凝胶法制备的,而纳米复合膜是使用溶液流延技术制备的。用X射线衍射和扫描电子显微镜分析ZnO纳米颗粒在PVA基质中的分散情况。随着聚合物基质中填料含量的变化,紫外可见光谱法被用于研究聚合物薄膜吸收率的变化。使用吸收和透射数据确定线性光学参数,例如折射率,消光系数和光导率。使用介电和阻抗谱技术在100 Hz-5 kHz的频率范围和310-360 K的温度范围内评估介电性能。随着ZnO纳米粒子浓度的增加和温度的升高,聚合物薄膜的介电常数会增加。上升。PVA基质中的ZnO含量低,可增强后者的光学和介电性能,使其可用于光电应用。
更新日期:2020-10-12
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