Gaining brilliant flexible, easily-processable, bendable, low-density and high electrical conductivity () materials with an excellent electromagnetic-interference (EMI) shielding performance is urgently needed in the fields of aerospace, aircraft, military, wearable and portable electronic industries. Therefore, the growing desire towards miniaturizing and developing high-frequency electronics is increasing incredibly today and grabbing much attention, however, they cause extreme heat accumulation and EM radiations that affect their performances as well as their hazardous effects on human health. So, polymer nanocomposites with high thermal conductivity () and EMI shielding effectiveness (SE) synchronously are urgently required to consume the generated heat and blocks the EM waves. Herein, poly(vinyl alcohol)/graphene nanosheets/carbonyl iron (PVA/GR/CIR) nanocomposite films are introduced as a new alternative candidate for EMI shielding applications with high in-plane , high mechanical functions, and EMI SE performance. The synergistic effect of GR and CIR on EMI shielding functions, thermal stability, mechanical properties, electrical features, and surface morphology has been explored. The increase in GR(x) amounts provides continuous GR layers and dense networks for conducting electrons and heats, provides the films with an admirable and total SE (SE) synchronously. Particularly, the PVA/GR/CIR films have shown an of 1.72 Sm, a large SE of 32.94 dB and a specific SE (SSE/t) of 4365 dBcmg due to the mutual role (effect) of both high electrical conductive graphene and high magnetic carbonyl iron in cancelling the magnetic and electric fields of the incident EM waves. Moreover, the layered structure of GR endows films with a high of 3.62±0.11 W/(m·K), which is 14-fold larger than that of green PVA. The high compatibility and fine dispersion of GR/CIR fillers endow the films with a high Young modulus of 2.16 GPa, which is 7-fold larger than that of green PVA. This work suggests a novel and feasible scheme for producing high EMI shielding and high thermal conductive polymeric films, which will have huge prospects in advanced technology such as electromagnetic (microwave) interference shielding, wearable, biological, smart fabrics, military technologies and electronic equipments.

中文翻译：

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一石二鸟：聚乙烯醇/石墨烯/羰基铁三元纳米复合薄膜的高电磁干扰屏蔽效能和高导热率

航空航天、飞机、军事、可穿戴和便携式电子行业等领域迫切需要获得优异的柔性、易加工、可弯曲、低密度、高导电率和优异的电磁干扰（EMI）屏蔽性能的材料。因此，当今对小型化和开发高频电子产品的需求日益增长，并引起了广泛关注，然而，它们会导致极端的热量积累和电磁辐射，影响其性能并对人类健康产生有害影响。因此，迫切需要同时具有高导热率（）和EMI屏蔽效能（SE）的聚合物纳米复合材料来消耗所产生的热量并阻挡电磁波。在此，聚乙烯醇/石墨烯纳米片/羰基铁（PVA/GR/CIR）纳米复合薄膜被介绍为具有高面内、高机械功能和EMI SE性能的EMI屏蔽应用的新替代候选材料。探索了 GR 和 CIR 对 EMI 屏蔽功能、热稳定性、机械性能、电气特性和表面形态的协同效应。 GR(x) 量的增加提供了连续的 GR 层和用于传导电子和热量的致密网络，同时为薄膜提供了令人钦佩的总 SE (SE)。特别是，由于高导电石墨烯和高导电石墨烯的相互作用（效果），PVA/GR/CIR薄膜表现出1.72 Sm、32.94 dB的大SE和4365 dBcmg的比SE（SSE/t）。磁性羰基铁可以抵消入射电磁波的磁场和电场。此外，GR的层状结构赋予薄膜高达3.62±0.11 W/(m·K)，是绿色PVA的14倍。 GR/CIR填料的高相容性和精细分散性赋予薄膜高达2.16 GPa的杨氏模量，是绿色PVA的7倍。这项工作提出了一种新颖可行的生产高EMI屏蔽和高导热聚合物薄膜的方案，该方案在电磁（微波）干扰屏蔽、可穿戴、生物、智能织物、军事技术和电子设备等先进技术中具有巨大的前景。