Polyvinyl alcohol (PVA) and Chitosan (CS)-based novel composites were prepared using solution casting technique by introducing graphite oxide (GO) and nickel oxide (NiO) as nanofillers. The structural, thermal and mechanical properties of PVA/CS/GO/NiO nanocomposites were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The dielectric and electromagnetic interference (EMI) shielding properties of synthesized nanocomposites were also investigated. The addition of dual nanofillers in the PVA/CS blend resulted in improved thermal stability of nanocomposites through the interaction of nanofillers with OH groups of polymer matrices. The DMA results displayed higher storage and loss modulus at low temperature for nanocomposite with 1.5/15 wt% of GO/NiO loading. The maximum values of dielectric constant and dielectric loss obtained are 1315.5 and 11.1 at the low-frequency region, respectively. The absorption dominated EMI shielding effectiveness (SE) was observed with a maximum EMI SE value of 12 dB for nanocomposite film containing 3.0/30 wt% of GO/NiO as compared to EMI SE value of 0.3 dB for PVA/CS blend in Ku-band (12–18 GHz) region. The electrical network formation by GO and NiO in the polymer matrix resulted in an improved EMI SE which further emphasizes the potential use of these nanocomposite films as an effective EMI shielding material.

聚乙烯醇（PVA）和壳聚糖（CS）为基础的新型复合材料采用溶液浇铸技术，通过引入氧化石墨（GO）和氧化镍（NiO）作为纳米填料来制备。使用傅里叶变换红外光谱（FTIR），X射线衍射（XRD），热重分析仪（TGA），差示扫描量热法（DSC）和动态力学研究了PVA / CS / GO / NiO纳米复合材料的结构，热和机械性能分析（DMA）。还研究了合成纳米复合材料的介电和电磁干扰（EMI）屏蔽性能。在PVA / CS共混物中添加双纳米填料，通过纳米填料与聚合物基体的OH基团的相互作用，提高了纳米复合材料的热稳定性。DMA结果显示，GO / NiO负载量为1.5 / 15 wt％的纳米复合材料在低温下具有更高的存储和损耗模量。在低频区域获得的介电常数和介电损耗的最大值分别为1315.5和11.1。在含有3.0 / 30 wt％GO / NiO的纳米复合膜中，最大的EMI SE值为12 dB，而在Ku-频带（12–18 GHz）区域。由GO和NiO在聚合物基质中形成的电网络导致了EMI SE的改善，这进一步强调了这些纳米复合薄膜作为有效的EMI屏蔽材料的潜在用途。在低频区域获得的介电常数和介电损耗的最大值分别为1315.5和11.1。在包含3.0 / 30 wt％GO / NiO的纳米复合薄膜中，最大的EMI SE值为12 dB，而在Ku-PVA中，PVA / CS混合物的EMI SE值为0.3 dB，观察到吸收主导的EMI屏蔽效果（SE）。频带（12–18 GHz）区域。由GO和NiO在聚合物基质中形成的电网络导致了EMI SE的改善，这进一步强调了这些纳米复合薄膜作为有效的EMI屏蔽材料的潜在用途。在低频区域获得的介电常数和介电损耗的最大值分别为1315.5和11.1。在含有3.0 / 30 wt％GO / NiO的纳米复合膜中，最大的EMI SE值为12 dB，而在Ku-频段（12–18 GHz）区域。由GO和NiO在聚合物基质中形成的电网络导致了EMI SE的改善，这进一步强调了这些纳米复合薄膜作为有效的EMI屏蔽材料的潜在用途。在Ku频段（12–18 GHz）区域中，PVA / CS混合为3 dB。由GO和NiO在聚合物基质中形成的电网络导致了EMI SE的改善，这进一步强调了这些纳米复合薄膜作为有效的EMI屏蔽材料的潜在用途。在Ku波段（12–18 GHz）区域中，PVA / CS混合为3 dB。由GO和NiO在聚合物基质中形成的电网络导致了EMI SE的改善，这进一步强调了这些纳米复合薄膜作为有效的EMI屏蔽材料的潜在用途。