Ultrathin carbon foams for effective electromagnetic interference shielding

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• 作者：Yang Li^a ; Bin Shen^a ; ^{shenbin@nimte.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Xueliang Pei^b ; Yonggang Zhang^b ; Da Yi^c ; Wentao Zhai^a ; ^{wtzhai@nimte.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Lihua Zhang^a ; Xingchang Wei^c ; Wenge Zheng^a ; ^{wgzheng@nimte.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Carbon
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：100
• 期：Complete
• 页码：375-385
• 全文大小：3056 K

文摘

Ultrathin carbon foams with the thickness about 24 μm 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 μm, respectively. The carbon foams with high thermal stability are very promising in the fabrication of ultrathin EMI shields for thermally harsh applications.