Abstract This paper aims to synthesize barium titanate (BaTiO3) nanocrystalline particles and to fabricate polyvinyl alcohol (PVA) films hosting BaTiO3 in order to enhance structural and optical properties. The tartrate precursor process is used to produce BaTiO3 nanocrystalline. By means of cast solution, the PVA – BaTiO3 nanocomposite films are prepared. The polymer films are described by X-ray diffractometer (XRD), Fourier-Transform Infrared (FTIR), UV–vis spectroscopy, and photoluminescence spectroscopy (PL). The study of XRD and FTIR indicates that complexity is established between BaTiO3 nanoparticles and PVA matrix. Furthermore, XRD analyzes emphasize a reduction in the crystallinity of polymer films by increasing of BaTiO3 nanoparticles within the matrix of PVA. It is noticed that as the BaTiO3 nanoparticles concentration increases in the PVA matrix, the optical band gap decreases while the Urbach energy increases. The PL spectra for PVA-BT films showed a photoemission peak at about 750 nm. This peak decreases in intensity and broadened with the increase of the BT concentration in the PVA matrix, which is related to the defects produced and causes disordering in the polymer matrix. The extinction coefficient, refractive index, optical conductivity and dielectric constants of the polymer films are also improved.

中文翻译：

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PVA-BaTiO3纳米复合薄膜的结构和光学性能

摘要 本文旨在合成钛酸钡 (BaTiO3) 纳米晶颗粒并制备含有 BaTiO3 的聚乙烯醇 (PVA) 薄膜，以提高结构和光学性能。酒石酸盐前驱体工艺用于生产 BaTiO3 纳米晶。通过浇铸溶液制备了PVA-BaTiO3纳米复合薄膜。聚合物薄膜通过 X 射线衍射仪 (XRD)、傅里叶变换红外 (FTIR)、紫外-可见光谱和光致发光光谱 (PL) 进行描述。XRD 和 FTIR 的研究表明 BaTiO3 纳米颗粒和 PVA 基质之间存在复杂性。此外，XRD 分析强调通过增加 PVA 基质中的 BaTiO3 纳米颗粒来降低聚合物薄膜的结晶度。注意到随着 PVA 基体中 BaTiO3 纳米粒子浓度的增加，光学带隙减小而 Urbach 能量增加。PVA-BT 薄膜的 PL 光谱在约 750 nm 处显示出光发射峰。随着 PVA 基体中 BT 浓度的增加，该峰强度降低并变宽，这与产生的缺陷有关并导致聚合物基体中的无序。聚合物薄膜的消光系数、折射率、光导率和介电常数也得到改善。这与产生的缺陷有关并导致聚合物基体无序。聚合物薄膜的消光系数、折射率、光导率和介电常数也得到改善。这与产生的缺陷有关并导致聚合物基体无序。聚合物薄膜的消光系数、折射率、光导率和介电常数也得到改善。