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Abstract
Nickel nanoparticles coated with few layers of carbon have been embedded into the polydimethylsiloxane (PDMS) matrix in concentrations up to 11 vol %. Dielectric and magnetic properties of composite materials have been studied in wide frequency (20 Hz–1 MHz) and temperature (130–430 K) ranges. It was demonstrated that the temperature behavior of dielectric properties is determined by glass transitions in the PDSM matrix below 200 K and the Maxwell–Wagner relaxation above room temperature. The possibility of using fabricated composites on the basis of the PDMS matrix for producing a wide range of passive electromagnetic components, such as frequency-selective filters, wide-band detectors/sensors of a bolometric type, and even electromagnetic “black holes” is also discussed.
Highlights
Composites based on polymer matrices with the inclusion of magnetic nano-sized particles has become a point of interest of many research groups
We study the dielectric and magnetic properties of composite materials based on a PDMS matrix with different concentrations of nanosized Ni@C core–shell particles in wide temperature and frequency ranges
Dielectric properties of composites with core–shell Ni@C nanoparticles embedded in a poly(dimethylsiloxane) matrix were studied in wide frequency (20 Hz–1 MHz) and temperature
Summary
Composites based on polymer matrices with the inclusion of magnetic nano-sized particles has become a point of interest of many research groups. Interest is mainly focused on elastomagnetic effects [1] and the wide prospects of applications as actuators, sensors [2,3,4,5], and shape-memory materials [6,7]. These materials demonstrate prospects for biomedicine [8,9], recording media, and high-frequency applications [10,11,12]. Being ferromagnetic or superparamagnetic Ni nanosized particles are very promising materials for electromagnetic absorbing devices The attenuation of such type of composites may reach up to 50 dB [13]. It was recently demonstrated that absorption properties depend on nanoparticle
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