Poly(vinyl alcohol) (PVA)-reduced graphene oxide (RGO) composite films have been prepared via in situ reduction of graphene oxide (GO) inside PVA matrix. In order to study microstructure and morphology of prepared PVA-RGO composite films, transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, UV-Visible absorption spectroscopy, X-ray diffraction (XRD) technique, and Raman spectroscopy were utilized. Thermogravimetric analysis (TGA) depicts the increase in thermal stability of PVA with increasing loading of RGO. The dielectric properties of composites were explored in frequency range 100 Hz–2.5 MHz which depicts increase in dielectric permittivity and ac conductivity of composite films with increasing RGO loading. The dielectric relaxation behavior and dispersion parameters of composite films were analyzed using Cole-Cole plots using a MATLAB program based on the Havrilak-Negami (HN) model.

中文翻译：

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原位制备的聚乙烯醇（PVA）还原氧化石墨烯（RGO）复合材料的热稳定性和介电弛豫行为

聚（乙烯醇）（PVA）还原的氧化石墨烯（RGO）复合薄膜已通过在 PVA 基质内原位还原氧化石墨烯（GO）制备。为了研究制备的 PVA-RGO 复合薄膜的微观结构和形貌，采用透射电子显微镜 (TEM)、傅里叶变换红外 (FTIR) 光谱、紫外-可见吸收光谱、X 射线衍射 (XRD) 技术和拉曼光谱进行了研究。利用。热重分析 (TGA) 描述了 PVA 的热稳定性随着 RGO 负载量的增加而增加。在 100 Hz-2.5 MHz 的频率范围内探索了复合材料的介电性能，这描述了复合薄膜的介电常数和交流电导率随着 RGO 负载的增加而增加。