Electrical conductivity in metal doped oxide nanotubes prepared with templating metal salt nanofibres

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Nanotubes are porous materials with a high anisotropy. This renders them attractive for a number of applications, e.g. as anisotropic electric conductors and for many aspects of nanoelectronics. For these applications the nanotubes must consist of at least semiconducting walls, which preferentially are additionally doped with highly conductive material, i.e. metal particles. For the synthesis of oxide or sulfide nanotubes suitable templates are necessary, which orientate the metal oxide precursors in a self-organisation process. In order to introduce a second metal which can penetrate into the walls and thus enhances the electric conductivity along the walls, our approach comprises the use of metal salt nanofibers as structure-directing agents. This project will focus on the development of suitable metal salt nanofibers, the creation of new types of semiconducting inorganic nanotubes and the anisotropic electronic properties of the metal-doped oxide, e.g. SiO2, SnO2 and TiO2, or sulfide (e.g. SnS2) nanotubes. Electrode arrangements for the conductivity measurements of single nanotubes will be developed. The conductance will be measured as function of temperature, gate voltage and magnetic field and models for the interpretation of the electron hopping in these composite materials will be developed.