NSTI Nanotech 2009

Dissymetric metal deposition on carbon nanotubes

C. Warakulwit, M.-H. Delville, V. Ravaine, J. Limtrakul, A. Kuhn
University of Bordeaux, FR

Keywords: carbon nanotubes, janus particles, electrodeposition


Short carbon nanotubes have been modified selectively on one end with metal using an original bulk technique based on bipolar electrochemistry. A stabilized suspension of nanotubes is introduced in a capillary containing an aqueous metal salt solution and a high electric field is applied to orientate and polarize the individual tubes. During their transport through the capillary under sufficient polarization (30kV) every nanotube will be the site of water oxidation on its one end, and the site of metal reduction on its other end, with the size of the formed metal cluster being proportional to the potential drop along the nanotube. This new approach can be generalized to other nanoobjects in order to create Janus type particles of various composition.
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