Inorganic nanotubes reinforced polyvinylidene fluoride composites as low-cost electromagnetic interference shielding materials

Abstract

Novel polymer nanocomposites comprising of MnO2 nanotubes (MNTs), functionalized multiwalled carbon nanotubes (f-MWCNTs), and polyvinylidene fluoride (PVDF) were synthesized. Homogeneous distribution of f-MWCNTs and MNTs in PVDF matrix were confirmed by field emission scanning electron microscopy. Electrical conductivity measurements were performed on these polymer composites using four probe technique. The addition of 2 wt.% of MNTs (2 wt.%, f-MWCNTs) to PVDF matrix results in an increase in the electrical conductivity from 10-16S/m to 4.5 × 10-5S/m (3.2 × 10-1S/m). Electromagnetic interference shielding effectiveness (EMI SE) was measured with vector network analyzer using waveguide sample holder in X-band frequency range. EMI SE of approximately 20 dB has been obtained with the addition of 5 wt.% MNTs-1 wt.% f-MWCNTs to PVDF in comparison with EMI SE of approximately 18 dB for 7 wt.% of f-MWCNTs indicating the potential use of the present MNT/f-MWCNT/PVDF composite as low-cost EMI shielding materials in X-band region.

Co-doped ZnO–PVA Nanocomposite for EMI Shielding

“…In this regard, polymer-matrix composites containing conductive fillers are attractive for shielding due to their processability and low density. Literature studies have been focused on filler's reinforced on thermoplastic polymer composites such as poly(methyl methacrylate) (PMMA) [25,26] , polypropylene (PP) [27] , polyvinylidene fluoride (PVDF) [28,29] , polyacrylate [30] , cellulose triacetate [31] , ethylene vinyl acetate (EVA) [32] , reactive ethylene tetrapolymer (RET) [33] , polycarbonate (PC) [34] and Poly (vinyl alcohol) (PVA) [35] are commonly used as polymer matrix due to flexible molecular chains, high strength and its ductile nature. In order to increase the EMI shielding efficiency, nanofillers doped into polymer matrix should be conducting / magnetic in nature.…”

Electromagnetic interference shielding in 1–18 GHz frequency and electrical property correlations in poly(vinylidene fluoride)–multi-walled carbon nanotube composites

“…11 However, they suffer from poor chemical resistance, corrosion, high density and difficulty in processing. 3,[12][13][14][15][16][17][18][19]28 Above electrical percolation threshold (PT), CNTs impart conductivity by creating a three dimensional interconnecting network in polymer matrix. Amongst various carbon based conducting composites; viz., carbon nanotubes (CNTs), 3,[12][13][14][15][16][17][18][19] graphite, 20 carbon black, [21][22][23] carbon fibres 24,25 and graphenes, 26,27 CNT composites have shown promising EMI shielding properties due to their good electrical properties and large aspect ratio.…”

“…Polymer composites with carbon based fillers could be potential replacements for conventional materials as EMI shielding materials due to their unique combination of light-weight and mechanical, electrical and thermal properties. 3,[12][13][14][15][17][18][19][20][28][29][30][31][32][33][34][35][36][37][38][39] Here we present a brief overview of some important studies reported on polymer based composites for EMI shielding applications. 3,[12][13][14][15][16][17][18][19]28 Above electrical percolation threshold (PT), CNTs impart conductivity by creating a three dimensional interconnecting network in polymer matrix.…”

Fabrication and electromagnetic properties of novel FeNi alloy-coated flake graphite prepared by electroless plating

“…It is well known that there are three loss mechanisms to prevent electromagnetic wave from penetrating EMI shielding materials, i. e. the reflection loss, absorption loss and multiple reflection loss of the electromagnetic radiation [2]. Allowing for the increasing requirements of high shielding effectiveness (SE) and low reflection of electromagnetic wave to the surrounding environment in modern electronic industry, improving the absorption loss of materials is very favorable and it has attracted much attention to develop various microwave absorbents.…”