Copper sulfide (CuS) nanoparticles were synthesized by solid-state reaction method under the flow of nitrogen. Polyvinyl alcohol/polyethylene glycol/copper sulfide (PVA/PEG:CuS) nanocomposite films with different concentrations of copper sulfide nanoparticles (1%, 3%, 5%) were prepared using casting technique. Structural and morphological properties of the prepared nano samples were investigated using X-ray diffraction data (XRD), transmission electron microscope and energy dispersive spectrometry techniques. The formation of nanocomposite films was confirmed by both XRD and fourier transform infrared techniques. Calculated and measured nano material particle size is almost similar. The characteristic peaks of nanocomposite films were found to be shifted towards higher wavenumber. The thermal stability behavior of row (PVA/PEG) blends and (PVA/PEG:CuS) nanocomposite films was examined using the thermogravimetric analysis technique. Samples doped with 5% CuS concentration revealed the highest thermal stability. The optical properties of undoped and nanocomposite films have been discussed in details using UV–Vis spectrophotometer. The optical transmittance revealed an apparent decrease (more than 40% for films doped 5% CuS). Different optical constants and dispersion parameters were discussed in detail and proved to be directly affected by nano doping concentrations. The optical energy gap values of polymer films decreased from 5.3 to 3.3 eV with the CuS nanoparticles incorporation. The study of the PVA/PEG nanocomposite films based on CuS nanoparticles has not been previously discussed. Therefore, this study is considered a new piece of work.

中文翻译：

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探索纳米硫化物对聚合物纳米复合材料的光学，结构和热性能的增强作用

在氮气流下，通过固相反应法合成了硫化铜（CuS）纳米粒子。采用流延技术制备了具有不同浓度的硫化铜纳米颗粒（1％，3％，5％）的聚乙烯醇/聚乙二醇/硫化铜（PVA / PEG：CuS）纳米复合膜。使用X射线衍射数据（XRD），透射电子显微镜和能量色散光谱技术研究了制备的纳米样品的结构和形态特性。通过XRD和傅立叶变换红外技术都证实了纳米复合膜的形成。计算和测量的纳米材料粒度几乎相似。发现纳米复合膜的特征峰向更高的波数移动。行（PVA / PEG）共混物和（PVA / PEG：使用热重分析技术检查了CuS）纳米复合膜。掺杂5％CuS的样品显示出最高的热稳定性。使用紫外可见分光光度计对未掺杂和纳米复合膜的光学特性进行了详细讨论。光学透射率显示出明显的降低（对于掺杂5％CuS的膜，其超过40％）。详细讨论了不同的光学常数和色散参数，并证明它们直接受到纳米掺杂浓度的影响。掺入CuS纳米粒子后，聚合物薄膜的光能隙值从5.3 eV降低到3.3 eV。先前尚未讨论基于CuS纳米粒子的PVA / PEG纳米复合薄膜的研究。因此，这项研究被认为是一项新的工作。