Abstract Submitted to the NANOTUBE'05 Conference:

Understanding the growth mechanism of carbon nanotubes and controlling their morphology and insertion still remain important challenges. The possibility to fill their inner channel with foreign materials also opens the way to the design of new hybrid materials with novel or enhanced properties, in terms of electron charge/spin transport or magnetic storage. We showed that the use of phosphorus as a co-catalyst enables to modify the kinetic equilibrium between the growth elementary steps of multiwall nanotubes (MWNT) and to induce a mechanism of sequential catalytic growth. Such a mechanism produces nanotube-based filaments periodically inserted with catalyst nanoparticles. The periodically inserted nanoparticles are nickel, cobalt or iron phosphides. We will present our work devoted to the control of the magnetic properties of the inserted metal phosphide nanoparticles and their characterisation by local techniques (MFM and electron holography).

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