Abstract The present work highlights the remarkably high electro-magnetic interference (EMI) shielding effectiveness of about 47 dB, exhibited by highly conducting and ordered poly(vinylidene fluoride) (PVDF)/graphene nanocomposite films of thickness around 20 µm, in the microwave frequency range 8–12 GHz, obtained by solution casting method. The films were characterized structurally using X-ray diffraction, Fourier transform infrared spectroscopy and Raman spectroscopy and the analysis indicates the enhancement in the highly ordered β phase of PVDF with the incorporation of graphene. In the entire frequency range of analysis, by absorption loss to the total EMI shielding effectiveness is very high compared to that by reflection loss. The high electrical conductivity of the composite films promotes shielding by absorption losses which is of ample significance in stealth applications. The present results identify the PVDF/graphene nanocomposite film as an effective, lightweight, free standing, flexible, mechanically and thermally stable, absorption dominated EMI shielding material with application prospects in a broad range of electromagnetic spectrum. The shielding effectiveness of these highly conducting nanocomposite films, far exceeds most of the previously reported values and meets the commercial requirements. The freestanding and flexible nature of these films facilitates EMI shielding applications without the geometrical constraints of the shape or size of the object.

中文翻译：

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关于聚（偏二氟乙烯）/石墨烯纳米复合材料的自立式和柔性薄膜中吸收主导的 EMI 屏蔽效应

摘要 目前的工作突出了约 47 dB 的显着高电磁干扰 (EMI) 屏蔽效率，由厚度约 20 µm 的高导电性和有序聚（偏二氟乙烯）（PVDF）/石墨烯纳米复合膜在微波频率下表现出来。范围 8-12 GHz，通过溶液浇铸方法获得。使用 X 射线衍射、傅里叶变换红外光谱和拉曼光谱对薄膜进行结构表征，分析表明 PVDF 的高度有序 β 相随着石墨烯的加入而增强。在分析的整个频率范围内，吸收损耗对总 EMI 的屏蔽效果与反射损耗相比非常高。复合膜的高导电性通过吸收损耗促进屏蔽，这在隐身应用中具有重要意义。目前的结果表明 PVDF/石墨烯纳米复合膜是一种有效、轻质、独立、柔韧、机械和热稳定、吸收主导的 EMI 屏蔽材料，在广泛的电磁频谱范围内具有应用前景。这些高导电纳米复合薄膜的屏蔽效果远远超过了之前报道的大部分数值，并且符合商业要求。这些薄膜的独立和柔性特性有助于 EMI 屏蔽应用，而不受物体形状或尺寸的几何限制。目前的结果表明 PVDF/石墨烯纳米复合膜是一种有效、轻质、独立、柔韧、机械和热稳定、吸收主导的 EMI 屏蔽材料，在广泛的电磁频谱范围内具有应用前景。这些高导电纳米复合薄膜的屏蔽效果远远超过了之前报道的大部分数值，并且符合商业要求。这些薄膜的独立和柔性特性有助于 EMI 屏蔽应用，而不受物体形状或尺寸的几何限制。目前的结果表明 PVDF/石墨烯纳米复合膜是一种有效、轻质、独立、柔韧、机械和热稳定、吸收主导的 EMI 屏蔽材料，在广泛的电磁频谱范围内具有应用前景。这些高导电纳米复合薄膜的屏蔽效果远远超过了之前报道的大部分数值，并且符合商业要求。这些薄膜的独立和柔性特性有助于 EMI 屏蔽应用，而不受物体形状或尺寸的几何限制。这些高导电纳米复合薄膜的屏蔽效果远远超过了之前报道的大部分数值，并且符合商业要求。这些薄膜的独立和柔性特性有助于 EMI 屏蔽应用，而不受物体形状或尺寸的几何限制。这些高导电纳米复合薄膜的屏蔽效果远远超过了之前报道的大部分数值，并且符合商业要求。这些薄膜的独立和柔性特性有助于 EMI 屏蔽应用，而不受物体形状或尺寸的几何限制。