Since their discovery [1], carbon Nanotubes (CNTs) has been attracting great interest from both fundamental and technological point of view. Some unique properties of CNTs, such as the possibility of tailoring the electrical conductivity, the mechanical resistance combined with the small dimensions and high aspect ratio, enable the development of nanotechnology in various fields. The encapsulation of materials inside the CNTs cavity has attracted great interest for fine tailoring of the physical properties at nanometric scale. In this paper, FePt clusters are inserted in CNTs using a new wet chemical method [2], [3]. The procedure allows the filling of CNTs with nanoclusters of various materials, without causing any external material growth. To transform the magnetically soft face-centred cubic crystallographic phase, obtained at T_room, into the magnetically hard face-centred tetragonal one (L1₀), heat treatment at high temperatures (700°C) is necessary. After annealing at 700 °C, regularly spacing of FePt nanoparticles within the CNTs were observed in high resolution transmission electron microscopy images. Moreover, X-ray diffraction measurements indicate the presence of L1₀, confirmed by magnetization cycles.

Reference:

1. S. Iijima, Nature,354,56 (1991)

2. A. Capobianchi, S. Foglia, P. Imperatori, European Application EP 1863738, Italian Application RM2005A000153, filed on 06.11.07.

3. Aldo Capobianchi, Sabrina Foglia, Patrizia Imperatori, Andrea Notargiacomo, Maria Giammatteo, Tiziana Del Buono and Elia Palange, Carbon, 45 (2007) 2205–2208

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