Abstract

Graphene oxide (GO) was prepared through the modified Hummar’s method. The polymer nanocomposites (PNC) composed of polyvinylidene fluoride (PVDF) and GO, with different wt% of GO were prepared, following the solution casting method in the form of thin films. The micro/nano-structural features and the optical properties of the PNC have been studied. The formation of GO was confirmed through FTIR and Raman spectra analysis. The microstructure, homogeneity, extent of agglomeration and the elemental composition of the PNC were found through the FESEM, energy dispersive analysis of X-rays and the elemental dot mapping, confirming excellent homogeneity of the PNC films. The optical properties like absorbance, refractive index, the extinction co-efficient and the dispersion behavior were investigated with the help of UV-visible spectrophotometer and spectroscopic ellipsometer respectively. The results reveal an increase in absorbance with the increase of weight % of GO in the PNC, attributed to higher electrical conductivity and surface area of GO. The optical parameters (e.g., refractive index, extinction coefficient, etc.) in the visible region show large variation as a function of weight % of GO due to PVDF/GO interaction and optimized properties was found to be for the 5% PNC, making it suitable for various optical applications.

摘要

通过改进的 Hummar 方法制备氧化石墨烯 (GO)。采用溶液流延法制备了由聚偏氟乙烯（PVDF）和GO组成的具有不同重量百分比的GO的聚合物纳米复合材料（PNC）。已经研究了PNC的微/纳米结构特征和光学特性。通过FTIR和拉曼光谱分析证实了GO的形成。通过FESEM、X射线能量色散分析和元素点映射发现了PNC的微观结构、均匀性、团聚程度和元素组成，证实了PNC薄膜的良好均匀性。吸光度、折射率等光学特性 分别借助紫外-可见分光光度计和光谱椭偏仪研究了消光系数和色散行为。结果表明，随着 PNC 中 GO 重量百分比的增加，吸光度增加，这归因于 GO 的较高电导率和表面积。由于 PVDF/GO 相互作用，可见光区域的光学参数（例如，折射率、消光系数等）显示出作为 GO 重量百分比的函数的较大变化，并且发现优化的特性是针对 5% PNC，使得它适用于各种光学应用。