title: Compressible Graphene-Coated Polymer Foams with Ultralow Density for Adjustable Electromagnetic Interference (EMI) Shielding.
abstract: The fabrication of low-density and compressible polymer/graphene composite (PGC) foams for adjustable electromagnetic interference (EMI) shielding remains a daunting challenge. Herein, ultralightweight and compressible PGC foams have been developed by simple solution dip-coating of graphene on commercial polyurethane (PU) sponges with highly porous network structure. The resultant PU/graphene (PUG) foams had a density as low as ∼0.027-0.030 g/cm(3) and possessed good comprehensive EMI shielding performance together with an absorption-dominant mechanism, possibly due to both conductive dissipation and multiple reflections and scattering of EM waves by the inside 3D conductive graphene network. Moreover, by taking advantage of their remarkable compressibility, the shielding performance of the PUG foams could be simply adjusted through a simple mechanical compression, showing promise for adjustable EMI shielding. We believe that the strategy for fabricating PGC foams through a simple dip-coating method could potentially promote the large-scale production of lightweight foam materials for EMI shielding.
authors.affiliation: Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences , Ningbo, Zhejiang 315201, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Shen
authors.affiliation: Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences , Ningbo, Zhejiang 315201, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.affiliation: Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences , Ningbo, Zhejiang 315201, China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Zhai
authors.affiliation: Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences , Ningbo, Zhejiang 315201, China.
authors.forename: Wenge
authors.initials: W
authors.lastname: Zheng
keywords: adjustable EMI shielding; compressible; low-density; multiple reflections; polymer/graphene composite foams