Influence of Structural Features and Physico-chemical Properties of Metal-carbon Nanocomposites with Ferromagnetic Metal Inclusions on Microwave Radiation

Authors	L. Kozhitov¹ , A. Kuzmenko², D. Muratov¹, V. Rodionov² , A. Popkova¹, E. Yakushko¹, M. Dobromyslov³
Affiliations	¹ National University of Science and Technology "MISIS", 4, Leninsky Pr., Moscow, Russia ² South-West State University, 94, 50 Let Octyabrya Str, Kursk, Russia ³ Pacific National University, 136, Tikhookeanskaya Str., Khabarovsk, Russia
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Issue	Volume 6, Year 2014, Number 3
Dates	Received 19 May 2014; published online 15 July 2014
Citation	L. Kozhitov, A. Kuzmenko, D. Muratov, et al., J. Nano- Electron. Phys. 6 No 3, 03024 (2014)
DOI
PACS Number(s)	07.78. + s, 07.85.Fv, 42.65.Dr, 07.57. – c
Keywords	Polyacrylonitrile (3) , IR-heating (3) , Metal-carbon nanocomposites (6) , Nanoparticles of metals, Carbon nanotubes (14) , Ferromagnetic nanoparticles, Radiation-absorbing materials, Transmission coefficient (2) , Reflection coefficient (3) .
Annotation	Metal-carbon nanocomposites on the basis of polyacrylonitrile and compounds of metals (Fe, Ni, Co) synthesized at IR-heating and studied by SEM, X-ray phase analysis, Raman scattering, IR Fourier spectroscopy are characterized by the carbon nanostructured amorphous graphite matrix with uniformly distributed nanoparticles of metals (10-30 nm), their oxides and compounds – FeNi3 and FeCo, multilayered carbon nanotubes (~ 7-22 nm), and in the composition of Fe-Co / C fullerene-like formations – C60. All nanocomposites feature high absorption of electromagnetic waves in the frequency range 20-40 GHz. Two absorption mechanisms are proposed: dielectric loss in the amorphous carbon matrix and scattering of electric and magnetic components by ferromagnetic inclusions. Absorption was – 8.68 dB for Fe-Ni / C, – 12.93 dB for Fe / C, and – 7.07 dB for Ni / C and for Fe-Co / C was found to be maximum in the whole range studied (more than – 40 dB) with a peak of – 52.83 dB at 24.27 GHz, which is explained probably by both high nanocomposite electric conductivity 2 S / m and high specific magnetization of phase FeCo.
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