Ultrathin carbon foams for effective electromagnetic interference shielding

被引:178
作者
Li, Yang [1 ]
Shen, Bin [1 ]
Pei, Xueliang [2 ]
Zhang, Yonggang [2 ]
Yi, Da [3 ]
Zhai, Wentao [1 ]
Zhang, Lihua [1 ]
Wei, Xingchang [3 ]
Zheng, Wenge [1 ]
机构
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo Key Lab Polymer Mat, Ningbo 315201, Zhejiang, Peoples R China
[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Natl Engn Lab Carbon Fiber Preparat Technol, Ningbo 315201, Zhejiang, Peoples R China
[3] Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词
REDUCED GRAPHENE OXIDES; FIBER-COMPOSITE FOAMS; ELECTRICAL-PROPERTIES; POLYIMIDE FILMS; TRANSPORT-PROPERTIES; GRAPHITE FILMS; GRAPHITIZATION; LIGHTWEIGHT; CARBONIZATION; KAPTON;
D O I
10.1016/j.carbon.2016.01.030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ultrathin carbon foams with the thickness about 24 mm were fabricated by the pyrolysis of polyimide/graphene composite foams. The addition of graphene was verified to stabilize the porous structure of the foams and accelerate their graphitization process simultaneously. Consequently, the well-defined carbon foams exhibited much higher electromagnetic interference (EMI) shielding effectiveness (SE) up to 24 dB over the frequency range of 8-12 GHz, in comparison with the non-foamed counterparts. The possible mechanism behind the phenomenon was attributed to their enhanced microwave absorption via the internal multiple scattering and reflections. Moreover, the SE could be further improved to 43 and 51 dB by increasing the sample thickness gradually to 51 and 73 mm, respectively. The carbon foams with high thermal stability are very promising in the fabrication of ultrathin EMI shields for thermally harsh applications. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:375 / 385
页数:11
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