Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 296, Issue 10, Pages 894-898Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201100035
Keywords
composites; conductivity; electromagnetic interference; foams; functionalized graphene
Funding
- Department of Science and Technology (DST), India
- IIT Madras
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Novel foam composites comprising functionalized graphene (f-G) and polyvinylidene fluoride (PVDF) were prepared and electrical conductivity and electromagnetic interference (EMI) shielding efficiency of the composites with different mass fractions of f-G have been investigated. The electrical conductivity increases with the increase in concentration of f-G in insulating PVDF matrix. A dramatic change in the conductivity is observed from 10(-16) S . m(-1) for insulating PVDF to 10(-4) S . m(-1) for 0.5 wt.% f-G reinforced PVDF composite, which can be attributed to high-aspect-ratio and highly conducting nature of f-G nanofiller, which forms a conductive network in the polymer. An EMI shielding effectiveness of approximate to 20 dB is obtained in X-band (8-12 GHz) region and 18 dB in broadband (1-8 GHz) region for 5 wt.% of f-G in foam composite. The application of conductive graphene foam composites as lightweight EMI shielding materials for X-band and broadband shielding has been demonstrated and the mechanism of EMI shielding in f-G/PVDF foam composites has been discussed.
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