In the present work, gallium oxide nanoparticles (nGa₂O₃) are synthesized via the thermal microwave combustion method, while nanocomposites of polyvinyl alcohol (PVA) polymer with various concentrations (0, 1, 2, 3, 4, and 5 wt%) of nGa₂O₃ are prepared by the casting technique. The structural characterization of nGa₂O₃, PVA, and films of PVA-Ga₂O₃ nanocomposites are studied using X-ray diffraction (XRD), High-resolution transmission electron microscopy (HRTEM), and Fourier-transform infrared (FTIR) spectroscopy. The HRTEM and XRD examinations showed that the prepared nGa₂O₃ has an average crystallite size of ~ 5.6 nm and particle size of ~ 0.9 µm. The FTIR analysis reveals the occurrence of some interactions between nGa₂O₃ and the functional groups of the PVA structure. On another side, the refractive index, absorption coefficient, and optical bandgap (E_g) were determined using the Wemple-DiDomenico single oscillator model. It was shown that E_g slightly reduced from 3.61 to 3.55 eV with increasing the Ga₂O₃ content to 3 wt%, while raised again up to 3.58 eV for 5 wt% Ga₂O₃. Other optical characteristics such as the optical density, extinction coefficient, optical susceptibility, thermal emissivity, optical sheet resistance for the PVA−Ga₂O₃ nanocomposites are investigated. The linear and nonlinear optical parameters together with their dependencies on the doping ratio reveals the qualification of PVA−Ga₂O₃ nanocomposites for nonlinear optical applications.

在目前的工作中，氧化镓纳米颗粒 (nGa ₂ O ₃ ) 是通过热微波燃烧法合成的，而聚乙烯醇 (PVA) 聚合物的纳米复合材料具有不同浓度 (0, 1, 2, 3, 4, 和 5 wt%) )的nGa ₂ O ₃ 是通过铸造技术制备的。使用 X 射线衍射 (XRD)、高分辨率透射电子显微镜 (HRTEM) 和傅里叶变换红外 (FTIR) 研究了 nGa ₂ O ₃、PVA 和 PVA-Ga ₂ O ₃纳米复合材料的结构表征光谱学。HRTEM 和 XRD 检测表明制备的 nGa ₂ O ₃平均晶粒尺寸约为 5.6 nm，粒径约为 0.9 µm。FTIR 分析揭示了 nGa ₂ O ₃与 PVA 结构的官能团之间发生了一些相互作用。另一方面，使用 Wemple-DiDomenico 单振荡器模型确定折射率、吸收系数和光学带隙 ( E _g )。结果表明，随着 Ga ₂ O ₃含量增加至 3 wt%，E _g从 3.61 eV 略微降低至 3.55 eV ，而对于 5 wt% Ga ₂ O ₃再次升高至 3.58 eV. 研究了 PVA-Ga ₂ O ₃纳米复合材料的其他光学特性，例如光密度、消光系数、光敏感度、热发射率、光学薄层电阻。线性和非线性光学参数以及它们对掺杂比的依赖性揭示了 PVA-Ga ₂ O ₃纳米复合材料在非线性光学应用中的资格。