Carbon nanotubes as a template for mild synthesis of magnetic CoFe2O4 nanowires |
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Authors: | Nicolas Keller,Cuong Pham-Huu,Jean-Marc Grenè che,Marc J. Ledoux |
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Affiliation: | a ELCASS (European Laboratory for Catalysis and Surface Science), Laboratoire des Matériaux, Surfaces et Procédés pour la Catalyse, UMR 7515 CNRS, Université Louis Pasteur, 25 rue Becquerel, BP 08, 67087 Strasbourg Cedex 2, France b IPCMS, UMR 7504 CNRS, Université Louis Pasteur, 23 rue du Loess, 67034 Strasbourg Cedex 2, France c LPEC, UMR 6087 CNRS, Université du Maine, avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France |
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Abstract: | Hundred nanometers outer diameter multi-walled carbon nanotubes have been used as suitable host template for synthesizing CoFe2O4 nanowires encapsulated inside nanotubes under mild conditions, i.e. 100 °C and atmospheric pressure, with a high filling yield of the nanotubes, using an aqueous nitrate precursor solution and the confinement effect provided by the surrounding walls. The formation of caps near the tube tips at the beginning of the nitrate decomposition led to consider each nanotube as a closed nanoreactor, in which the reaction conditions could be far different from the macroscopic conditions outside the tube. The structure of the CoFe2O4 nanowires could be continuously changed from a disordered hair-like dendritic structure at 100 °C to highly crystallized domains when increasing the temperature. A material with high coercivity at room temperature for small particles of about 25 nm in diameter was obtained by submitting the nanowires to an Ar treatment at 550 °C for 2 h. |
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Keywords: | A. Carbon nanotubes C. Transmission electron microscopy Mö ssbauer spectrometry D. Microstructure Magnetic properties |
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