Superhigh Electromagnetic Interference Shielding of Ultrathin Aligned Pristine Graphene Nanosheets Film
Superhigh Electromagnetic Interference Shielding of Ultrathin Aligned Pristine Graphene Nanosheets Film
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超薄定向原始石墨烯纳米片薄膜的超高电磁干扰屏蔽
DOI：
10.1002/adma.201907411
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发表时间：
2020-02-24
影响因子：
29.4
通讯作者：
Ren, Wencai
中科院分区：
文献类型：
--
作者：
Wei, Qinwei;Pei, Songfeng;Ren, Wencai
具有高屏蔽效能（SE）的超薄、轻质、高强度和导热的电磁干扰（EMI）屏蔽材料对于下一代便携式和可穿戴电子产品是高度期望的。原始石墨烯（PG）具有满足上述所有要求的巨大潜力，但PG纳米片的可加工性差阻碍了其应用。在这里，高效的合成高度对齐的层压PG膜和珍珠质样PG/聚合物复合材料与超高PG加载高达90重量%的扫描离心铸造方法的报告。由于PG-纳米片沉积诱导的高电导率和多次内反射，这种膜在超低厚度下显示出与报道的最佳合成材料MXene膜相当的超高EMI SE。厚度约为100 μ m的PG膜的EMI SE为93 dB，厚度约为60 μ m的PG/聚酰亚胺复合膜的EMI SE为63 dB。此外，这样的PG-纳米片-基膜显示出比它们的MXene对应物高得多的机械强度（高达145 MPa）和热导率（高达190 W m（-1）K-1）。这些优异的综合性能，沿着易于大规模生产，为PG纳米片在EMI屏蔽中的实际应用铺平了道路。
Ultrathin, lightweight, high-strength, and thermally conductive electromagnetic interference (EMI) shielding materials with high shielding effectiveness (SE) are highly desired for next-generation portable and wearable electronics. Pristine graphene (PG) has a great potential to meet all the above requirements, but the poor processability of PG nanosheets hinders its applications. Here, efficient synthesis of highly aligned laminated PG films and nacre-like PG/polymer composites with a superhigh PG loading up to 90 wt% by a scanning centrifugal casting method is reported. Due to the PG-nanosheets-alignment-induced high electrical conductivity and multiple internal reflections, such films show superhigh EMI SE comparable to the reported best synthetic material, MXene films, at an ultralow thickness. An EMI SE of 93 dB is obtained for the PG film at a thickness of approximate to 100 mu m, and 63 dB is achieved for the PG/polyimide composite film at a thickness of approximate to 60 mu m. Furthermore, such PG-nanosheets-based films show much higher mechanical strength (up to 145 MPa) and thermal conductivity (up to 190 W m(-1) K-1) than those of their MXene counterparts. These excellent comprehensive properties, along with ease of mass production, pave the way for practical applications of PG nanosheets in EMI shielding.