Functionalized Graphene–PVDF Foam Composites for EMI Shielding

Abstract

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 ≈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.

Estudio de Nanocompuestos de Espumas de Poliuretano Reforzadas con Nanocargas en Base Carbono

“…Theoretically, the higher the decibel level of EMI SE, the less energy is transmitted through the shielding material. [139] This is confirmed by the values of EMI SE and the average data of the transmissivity obtained. Although the main mechanism on all samples is the transmission of the incident radiation, the inclusion of MWCNTs, greatly increases the absorption mechanism of the EMI shielding in the X-band region.…”

NaCl leached sustainable porous flexible Fe3O4 decorated RGO-polyaniline/PVDF composite for durable application against electromagnetic pollution

“…Kuang et al [18] shows light weight poly(L-Lactic acid)(PLLA)-MWCNT foam achievẽ 23 dB SE value with 2.5 mm thickness at 10 wt% MWCNT loading. Eswaraiah et al [19] reported that PVDF/graphene foam shows EMI SE ~28 dB at 7 wt% functionalized graphene loading. The formation of foam at high filler loading is extremely difficult by traditional foaming methods (e.g., decomposition of chemical foaming agent) [10].…”

Absorption Characteristics of the Electromagnetic Wave and Magnetic Properties of the La0.8Ba0.2FexMn½(1-x)Ti½(1-x)O3 (x = 0.1–0.8) Perovskite System

“…Most electronic devices that work at high frequency, such as wireless telecommunication systems, local area networks, and other communication equipment, often have noise problems due to electromagnetic wave interference (EMI) (Wu & Li, 2011;Eswaraiah et al, 2011). EMI can reduce the performance of these devices.…”

“…Not surprisingly, the demand to eliminate EMI has attracted increased interest as a research 888 Absorption Characteristics of the Electromagnetic Wave and Magnetic Properties of the La0.8Ba0.2FexMn½(1-x)Ti½(1-x)O3 (x = 0.1-0.8) Perovskite System topic (Eswaraiah et al, 2011). Introducing materials that can absorb electromagnetic waves is an alternative solution to eliminating EMI effects.…”