Direct synthesis of L10 FePt nanoparticles within carbon nanotubes by wet chemical procedure

A Capobianchi (1) , S Laureti (1) , D Fiorani (1) , S Foglia (2) , E Palange (3)

1 ISM - Instituto di Struttura della Materia
2 Istituto di Fotonica e Nanotecnologie
3 Dipartimento di Ingegneria Elettrica e dell'Informazione

This paper reports on the low temperature synthesis of L1 0 iron-platinum (FePt) particles within Multi Wall Carbon Nanotubes using a novel wet chemical method that allows the filling of the nanotube cavity keeping clear its external wall. In the proposed procedure, nanotubes are filled with a precursor salt of hexaaquairon(II) hexachloroplatinate, ([Fe(H 2 O) 6 ][PtCl 6 ]) and nanoparticles of the magnetically hard phase are directly obtained by heating at 400°C in a reductive atmosphere. The advantage of such precursor, allowing to obtain at low temperature the L1 0 phase without passing trough the soft fcc phase, is due to its structure, where the Fe and Pt atoms are arranged in alternating planes, like in the fct FePt structure. Morphological, structural and magnetic properties of the filled nanotubes have been investigated by transmission electron microscopy, X-ray diffraction and magnetization measurements. The results show the coexistence of nanoparticles in the superparamagnetic and blocked state, depending on the temperature, due to the particle size distribution.

Mots clés: Physical Sciences

A Capobianchi, S Laureti, D Fiorani, S Foglia, E Palange. Direct synthesis of L10 FePt nanoparticles within carbon nanotubes by wet chemical procedure. Journal of Physics D: Applied Physics, 2010, 43 (47), pp.474013. ⟨10.1088/0022-3727/43/47/474013⟩. ⟨hal-00597840⟩