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Carbon nanotubes as a 1D template for the synthesis of air sensitive materials: about the confinement effect

Tessonnier, Jean-Philippe and Winé, Gauthier and Estournès, Claude and Leuvrey, Cédric and Ledoux, Marc-Jacques and Pham-Huu, Cuong Carbon nanotubes as a 1D template for the synthesis of air sensitive materials: about the confinement effect. (2005) Catalysis Today, 1. 29-33. ISSN 0920-5861

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Official URL: http://dx.doi.org/doi:10.1016/j.cattod.2005.02.032


Cobalt ferrite and cobalt iron nanowires with an average diameter of 50 nm and lengths up to several micrometers were synthesized inside multi-walled carbon nanotubes (MWNTs) under mild reaction conditions, i.e. 100 °C and atmospheric pressure, using an aqueous nitrate precursor salt filling the tubes. The concept of a confinement effect inside carbon nanotubes has been advanced to explain the formation of CoFe2O4 under such mild reaction conditions. The formation of caps near the tube tips at the beginning of the nitrate decomposition meant that each nanotube was considered as a closed nanoreactor, in which the reaction conditions could be very different to the macroscopic conditions outside the tube. The subsequent reduction of the CoFe2O4 allowed to obtain CoFe nanowires cast in the carbon nanotubes. These nanowires exhibit a high resistance towards oxidation, whereas bulk CoFe is known to undergo oxidation at room temperature and atmospheric pressure. This phenomenon was attributed to oxygen diffusion problems due to the confinement effect of the carbon nanotubes.

Item Type:Article
Additional Information:http://www.sciencedirect.com/science/journal/09205861
HAL Id:hal-03601608
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
Laboratory name:
Deposited On:07 May 2008 08:07

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