Polyvinyl alcohol–iron oxide nanocomposite (PVA-Fe2O3 NC) films have been formed when iron oxide nanoparticles (Fe2O3 NPs) are incorporated into a polyvinyl alcohol (PVA) base matrix. In this study, for the preparation of a series of PVA-Fe2O3 NC films, different weight percentages (0, 2, 4, 6, and 8 wt. %) of Fe2O3 NPs have been added into the PVA solution using the solution cast method. The morphological and spectroscopic properties of the PVA-Fe2O3 NC films have been studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet-visible spectrophotometry (UV-Vis) spectroscopy techniques. XRD studies reveal that the original structure of the Fe2O3 NPs is preserved in the PVA-Fe2O3 NC films, and the crystallinity of the PVA-Fe2O3NC films has been increased. The SEM images confirm that the Fe2O3 NPs have been homogeneously distributed in 3-dimension with dots and rod-like structures. The UV-visible investigations have been carried out for the series of PVA-Fe2O3 NC films, which result in a significant change in opto-electronic properties. With an increasing weight percentage of Fe2O3 NPs in the PVA-Fe2O3 NC films, the direct bandgap decreased from 5.39 eV to 5.01 eV, the indirect bandgap decreased from 4.73 eV to 3.27 eV, the Urbach energy increased from 0.428 eV to 0.538 eV, the linear refractive index increased from 1.63 to 5.86, and the extinction coefficient increased from 1.86 X 10-6 to 1.74 X 10-5. These results have shown that the spectroscopic properties of PVA-Fe2O3 NC films are modified considerably with the small addition of Fe2O3 NPs in the PVA matrix, which are useful for optoelectronic applications.

中文翻译：

---

掺入 PVA 纳米复合膜的 Fe2O3 纳米粒子的合成与表征

将氧化铁纳米粒子 (Fe2O3 NPs) 掺入聚乙烯醇 (PVA) 基体时，已形成聚乙烯醇-氧化铁纳米复合材料 (PVA-Fe2O3 NC) 薄膜。在这项研究中，为了制备一系列 PVA-Fe2O3 NC 薄膜，使用溶液流延法将不同重量百分比（0、2、4、6 和 8 wt.%）的 Fe2O3 NP 添加到 PVA 溶液中. 已经使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和紫外-可见分光光度法 (UV-Vis) 光谱技术研究了 PVA-Fe2O3 NC 薄膜的形态和光谱性质。XRD 研究表明，PVA-Fe2O3 NC 薄膜中保留了 Fe2O3 NPs 的原始结构，并且 PVA-Fe2O3NC 薄膜的结晶度有所提高。SEM 图像证实 Fe2O3 NPs 在 3 维空间中均匀分布，具有点状和棒状结构。已经对系列 PVA-Fe2O3 NC 薄膜进行了紫外-可见光研究，这导致了光电性能的显着变化。随着 PVA-Fe2O3 NC 薄膜中 Fe2O3 NPs 重量百分比的增加，直接带隙从 5.39 eV 减小到 5.01 eV，间接带隙从 4.73 eV 减小到 3.27 eV，Urbach 能量从 0.428 eV 增加到 0.538 eV，线性折射率从1.63增加到5.86，消光系数从1.86×10-6增加到1.74×10-5。这些结果表明，PVA-Fe2O3 NC 薄膜的光谱性质随着在 PVA 基质中少量添加 Fe2O3 NPs 而显着改变，