Strong flexible polymer/graphene composite films with 3D saw-tooth folding for enhanced and tunable electromagnetic shielding

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• 作者：Bin Shen^a ; ^{shenbin@nimte.ac.cn} ; Yang Li^a ; Da Yi^b ; Wentao Zhai^a ; ^{wtzhai@nimte.ac.cn} ; Xingchang Wei^b ; Wenge Zheng^a ; ^{wgzheng@nimte.ac.cn}
• 关键词：Strong and flexible ; Polymer/graphene sandwich film ; Saw-tooth folding ; Enhanced and tunable electromagnetic shielding
• 刊名：Carbon
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：113
• 期：Complete
• 页码：55-62
• 全文大小：3222 K
• 卷排序：113

文摘

Strong flexible polymer/graphene composite films with ideal electromagnetic interference (EMI) shielding are fabricated through constructing a sandwich structure consisting of polyester non-woven fabric as reinforcing interlayer and thermoplastic polyurethane (TPU) composite with high graphene loading as conductive coating layer. The engineered sandwich film (defined as TPU/G film) with graphene loading of ∼20 wt% and total coating thickness of ∼50 μm not only possesses excellent mechanical flexibility and strong strength, but also exhibits qualified bandwidth of shielding effectiveness (SE) ≥ 20 dB as wide as ∼49.1 GHz in a broadband frequency range of 5.4–59.6 GHz. Moreover, saw-tooth folding of the flexible TPU/G films could efficiently enhance the shielding performance, and more conductive folded film with smaller included angle plus longer side would result in much greater SE enhancement along with reduced EM reflection. This finding also realizes the convenient performance regulation of the folded TPU/G films through a simple mechanical deformation, showing promise for tunable EMI shielding.