Abstract
Polypyrrole one-dimensional nanostructures (nanotubes, nanobelts and nanofibers) were prepared using three various dyes (Methyl Orange, Methylene Blue and Eriochrome Black T). Their high electrical conductivity (from 17.1 to 60.9 S cm−1), good thermal stability (in the range from 25 to 150 °C) and resistivity against ageing (half-time of electrical conductivity around 80 days and better) were used in preparation of lightweight and flexible composites with silicone for electromagnetic interference shielding in the C-band region (5.85–8.2 GHz). The nanostructures’ morphology and chemical structure were characterized by scanning electron microscopy, Brunauer–Emmett–Teller specific surface measurement and attenuated total reflection Fourier-transform infrared spectroscopy. DC electrical conductivity was measured using the Van der Pauw method. Complex permittivity and AC electrical conductivity of respective silicone composites were calculated from the measured scattering parameters. The relationships between structure, electrical properties and shielding efficiency were studied. It was found that 2 mm-thick silicone composites of polypyrrole nanotubes and nanobelts shield almost 80% of incident radiation in the C-band at very low loading of conductive filler in the silicone (5% w/w). Resulting lightweight and flexible polypyrrole composites exhibit promising properties for shielding of electromagnetic interference in sensitive biological and electronic systems.
Highlights
Electromagnetic field emitted by modern electronic devices interferes with sensitive electronic circuits or even with living organisms in a process referred to as electromagnetic interference (EMI)
The disadvantage of applying the globular morphology in EMI shielding is the necessity of using high loadings (~tens of % w/w) in order to reach the percolation threshold [16], which may result in deterioration of the mechanical properties of the used matrix
PPy synthesized in the presence of various organic dyes creates uniform nanostructures of 1D, 2D or 3D morphology, exhibiting favorable properties for application in shielding of EMI
Summary
Electromagnetic field emitted by modern electronic devices interferes with sensitive electronic circuits or even with living organisms in a process referred to as electromagnetic interference (EMI). The disadvantage of applying the globular morphology in EMI shielding is the necessity of using high loadings (~tens of % w/w) in order to reach the percolation threshold [16], which may result in deterioration of the mechanical properties of the used matrix. In our previous work [30], we tested and compared EMI shielding properties of several PPy 1D nano- and 3D microscaled morphologies including globules, microbarrels and nanotubes. Three promising candidates of PPy 1D structures with high aspect ratio for EMI shielding application in the region from 5.85 to 8.2 GHz were experimentally compared. They were synthesized in the presence of Methyl Orange (PPy-MO), Methylene Blue (PPy-MB) and. ThAeTsRe -rFeTsuIRlt)samndayelbeectsruicbaslepqruoepnetrltyieus s(eAdCfoanr dthDeCpreelpecatrraictiaolncoonfdaudcvtaivnictye,dccoommppleoxsipteesrminittteinvditeyd) hfoavr eEMI shbieeeldnicnogmopnatrhede.bTahseisseorfe1sDultPsPmyasytrbuecstuubresse.quently used for the preparation of advanced composites intended for EMI shielding on the basis of 1D PPy structures
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