ACS Appl Mater Interfaces. 2018 Sep 12;10(36):30762-30773. doi: 10.1021/acsami.8b10819. Epub 2018 Aug 27.
Herein, we report high electromagnetic interference (EMI) shielding effectiveness of -40 dB in the K-band (for a 600 μm thick film) through a unique core-shell heterostructure consisting of a ferritic core (FeO) and a conducting shell (multiwalled carbon nanotubes, MWCNTs) supported onto a dielectric spacer (here SiO). In recent times, materials with good flexibility, heat dissipation ability, and sustainability together with efficient EMI shielding at minimal thickness are highly desirable, especially if they can be easily processed into thin films. The resulting composites here shielded EM radiation mostly through absorption driven by multiple interfaces provided by the heterostructure. The shielding value obtained here is fairly superior among the different polymer nanocomposite-based EMI shielding materials. In addition to EMI shielding capability, this composite material exhibits outstanding heat dissipation ability (72 °C to room temperature in less than 90 s) as well as high heat sustainability. The composite material retained its EMI shielding property even after repeated heat cycles, thereby opening new avenues in the design of lightweight, flexible, and sustainable EMI shielding materials.
在此，我们通过独特的核壳异质结构报告了在 K 波段（对于 600μm 厚的薄膜）具有-40 dB 高电磁干扰 (EMI) 屏蔽效能的材料，该核壳异质结构由铁磁核（FeO）和导电壳（多壁碳纳米管，MWCNTs）组成，支撑在介电间隔物（这里是 SiO）上。在最近，具有良好的柔韧性、散热能力和可持续性以及在最小厚度下高效 EMI 屏蔽的材料是非常需要的，特别是如果它们可以很容易地加工成薄膜。这里得到的复合材料主要通过异质结构提供的多个界面驱动的吸收来屏蔽电磁辐射。与不同的基于聚合物纳米复合材料的 EMI 屏蔽材料相比，这里获得的屏蔽值相当优越。除了 EMI 屏蔽能力外，这种复合材料还表现出出色的散热能力（在不到 90 秒内从 72°C 降至室温）以及高热可持续性。即使在反复的热循环后，复合材料仍保留其 EMI 屏蔽性能，从而为设计轻量、灵活和可持续的 EMI 屏蔽材料开辟了新途径。
