We prepared poly(vinylidene fluoride) (PVDF)/carbon/Ni-chain composites by dispersing Ni chains, and either carbon nanotubes (CNTs) or graphene nanoplatelets (GNPs) into a PVDF solution. The electrical conductivity and the electromagnetic interference (EMI) shielding properties of the PVDF/CNT/Ni-chain and the PVDF/GNP/Ni-chain composites were increased by increasing the Ni-chain filler content. The electrical conductivity of the PVDF/CNT/10 wt%Ni-chain composite was lower than the PVDF/CNT/6 wt%Ni-chain composite. We attributed this abnormality to the Ni chains having blocked the CNT connections, when there was a high Ni-chain content. Furthermore, the PVDF-based composites' EMI shielding properties were effectively tuned by controlling the films' thicknesses. The total shielding of the PVDF/CNT/6 wt%Ni-chain and the PVDF/GNP/8 wt%Ni-chain composite films increased from 23.6 to 57.3 dB and from 22.7 to 55.8 dB, as their thicknesses were increased from 0.3 mm to 0.6 mm, respectively. The synergetic relationship between the Ni chains and the carbon materials (CNT or GNP), meant that the main EMI shielding mechanisms of the PVDF/carbon/Ni-chain composites had resulted from the absorption process. Moreover, these composites possessed high thermal conductivity, which can convert microwave energy into Joule heating systems. Thus, these PVDF-based composite films can be used to make high-efficiency EMI shielding devices that can rapidly dissipate heat.

中文翻译：

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高散热柔性聚偏二氟乙烯复合薄膜中碳材料与Ni链的协同作用以提高电磁屏蔽性能

我们通过将 Ni 链和碳纳米管 (CNT) 或石墨烯纳米片 (GNP) 分散到 PVDF 溶液中来制备聚偏二氟乙烯 (PVDF)/碳/镍链复合材料。PVDF/CNT/Ni 链和 PVDF/GNP/Ni 链复合材料的导电性和电磁干扰 (EMI) 屏蔽性能通过增加 Ni 链填料含量而增加。PVDF/CNT/10wt%Ni-链复合材料的电导率低于PVDF/CNT/6wt%Ni-链复合材料。我们将这种异常归因于 Ni 链阻塞了 CNT 连接，当 Ni 链含量很高时。此外，通过控制薄膜的厚度，PVDF 基复合材料的 EMI 屏蔽性能得到了有效调整。PVDF/CNT/6 wt% Ni-chain 和 PVDF/GNP/8 wt% Ni-chain 复合膜的总屏蔽从 23.6 dB 增加到 57.3 dB，从 22.7 dB 增加到 55.8 dB，因为它们的厚度从 0.3 mm 增加分别为 0.6 毫米。Ni 链与碳材料（CNT 或 GNP）之间的协同关系意味着 PVDF/碳/Ni 链复合材料的主要 EMI 屏蔽机制来自吸收过程。此外，这些复合材料具有高导热性，可以将微波能转化为焦耳加热系统。因此，这些基于 PVDF 的复合薄膜可用于制造可快速散热的高效 EMI 屏蔽装置。Ni 链与碳材料（CNT 或 GNP）之间的协同关系意味着 PVDF/碳/Ni 链复合材料的主要 EMI 屏蔽机制来自吸收过程。此外，这些复合材料具有高导热性，可以将微波能转化为焦耳加热系统。因此，这些基于 PVDF 的复合薄膜可用于制造可快速散热的高效 EMI 屏蔽装置。Ni 链与碳材料（CNT 或 GNP）之间的协同关系意味着 PVDF/碳/Ni 链复合材料的主要 EMI 屏蔽机制来自吸收过程。此外，这些复合材料具有高导热性，可以将微波能转化为焦耳加热系统。因此，这些基于 PVDF 的复合薄膜可用于制造可快速散热的高效 EMI 屏蔽装置。