Ultra microelectrodes from MWCNT Bundles

Bundles of Multi Wall Carbon Nanotubes (MWCNT) are used as ultra microelectrodes. They show featureless cyclic voltammograms in 0.1 m KCl indicating the absence of surface functionalities. Typical behavior for radial diffusion was found for faradaic processes as expected for low dimensional electrodes. Since CNTs are hydrophobic by nature, strategies are explored overcome the surface tension of aqueous electrolytes. Additionally, methods to cut the MWCNT bundle to a desired length and to get insulating coatings are demonstrated. These more technological aspects are very interesting in terms of practical use for all applications of individual CNT electrodes.