Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 12, Pages 8050-8057Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b11715
Keywords
low-density; compressible; polymer/graphene composite foams; multiple reflections; adjustable EMI shielding
Funding
- China Postdoctoral Science Foundation [2015M570531]
- National Natural Science Foundation of China [51473181, 61274110]
- Ningbo Key Laboratory of Polymer Materials [2010A22001]
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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 similar to 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.
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