Nanocomposites and nanomaterials

Structure and magnetic properties CNT decorated by FeNi CoFe nanoparticles
L.Yu. Matzui1, L.L. Vovchenko1, O.A. Syvolozhskyi1 O.S. Yakovenko1, A.G. Dyachenko1, O V. Ischenko1, A.V. Vakaliuk 1,A.V. Bodnaruk2, V.M. Kalita2,3

1Taras Shevchenko National University of Kyiv, Volodymyrs’ka str., 64/13, Kyiv, 01601, Ukraine.
2Institute of Physics, NAS of Ukraine, Prospekt Nauky 46, Kyiv 03028, Ukraine; andrew.bodnaruk@gmail.com (A.V.B.) 
3National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Prospekt Peremohy 37, Kyiv 03056, Ukraine;
*	Correspondence: mail.olexiy@gmail.com;

Integrating of nanoscale magnetic alloys FeNi Co93Fe07 with nanocarbon will combine the excellent properties of both of them into one nanosystem which promises many practical applications in future nanotechnology The aim of this study was to experimentally investigate the effect CNT decoration by FeNi Co93Fe07 on structural and magnetic properties of Co93Fe07(CNT) ,Ni80Fe20(CNT) composites.
Herein, we demonstrate an easy wet chemical route to grow magnetic alloy nanoparticles (Fe80Ni20 or Co93Fe07) on CNT . Morphology, size, structure of obtained composites depending on composition have been investigated , The magnetic hysteresis loops were investigated by using a vibrating sample magnetometer (LDJ-9500, LDJElectronics, Troy, MI 48099, USA) with a maximum magnetic field of 10 kOe. The temperature hold was realized by vapor nitrogen transmission through the experimental chamber. The magnetization curves were measured at the temperature range 100-290 K.
It was confirmed by SEM and XRD that the method gives nanopowder where the metal component is in the form of granules (20-40 nm in diameter)which are distributed over the surface and edges of the nanotubes. The results demonstrate that distribution of the metal component Co93Fe07 Fe20Ni80 on CNT is mostly homogeneous, although there are separate areas of agglomeration of the metal phase.  Measurements of magnetic properties confirmed that metal particles are small single-domain, randomly oriented assembly of spherical (or close to spherical) particles on the CNT surface.
Temperature dependences of the main magnetic parameters of the CNT-Fe20Ni80 particles which were extracted from magnetization curves(hysteresis loops) indicated that, the saturation magnetization of CNT-Fe20Ni80 particles weakly depends on temperature while coercive ﬁeld Hc essentially increase under temperature decrease.