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Ultrathin and flexible biomass-derived C@CoFe nanocomposite films for efficient electromagnetic interference shielding
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-03-02 , DOI: 10.1016/j.compositesb.2020.107935
Jianwei Li , Yuanqing Ding , Qiang Gao , Hongming Zhang , Xinhai He , Zhonglei Ma , Bin Wang , Guangcheng Zhang

Developing ultrathin, lightweight, flexible and efficient electromagnetic interference (EMI) shielding materials is still a long-standing issue. Herein, a series of biomass derived carbon composite films with superior EMI shielding performance are reported. The cotton derived carbon fabric wrapped with CoFe alloy nanoparticles (CCF@CoFe) was prepared by pyrolysis at temperature of 600–800 °C and subsequently encapsulated by polyimide (PI) resin to obtain the CCF@CoFe/PI films. The prepared composite films present favorable flexibility, remarkable tensile strength of ~10 MPa and exceptional EMI shielding efficiency of ~32 dB over the X-band with the thickness of 0.16 mm. In addition, the EMI shielding performance of the composite films can be adjusted by changing the CoFe loading content and pyrolysis temperature, and an EMI shielding efficiency of ~62 dB is achieved by stacking 6 layers of nanocomposite films, shielding 99.999937% of incident electromagnetic waves with thickness of only 0.98 mm. In view of excellent comprehensive properties, this ultrathin and low-cost biomass derived films are highly promising materials for EMI shielding in practical applications.



中文翻译:

超薄且柔性的生物质衍生的C @ CoFe纳米复合薄膜可有效屏蔽电磁干扰

开发超薄,轻便,灵活和高效的电磁干扰(EMI)屏蔽材料仍然是一个长期存在的问题。在此,报道了一系列具有优异的EMI屏蔽性能的源自生物质的碳复合膜。通过在600–800°C的温度下热解来制备包裹有CoFe合金纳米颗粒(CCF @ CoFe)的棉制碳纤维,然后用聚酰亚胺(PI)树脂封装以获得CCF @ CoFe / PI膜。所制备的复合膜具有良好的柔韧性,在X波段上具有0.16 mm的厚度,具有出色的柔韧性,〜10 MPa的卓越抗拉强度和〜32 dB的出色EMI屏蔽效率。另外,可以通过改变CoFe的负载量和热解温度来调节复合膜的EMI屏蔽性能,通过堆叠6层纳米复合薄膜可实现约62 dB的EMI屏蔽效率,屏蔽99.999937%的入射电磁波,厚度仅为0.98 mm。考虑到优异的综合性能,这种超薄且低成本的生物质衍生薄膜是在实际应用中极有希望的EMI屏蔽材料。

更新日期:2020-03-02
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