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

纳米管是一种具有高各向异性的多孔材料。这使得它们在许多应用中具有吸引力，例如作为各向异性电导体和纳米电子学的许多方面。对于这些应用，纳米管必须至少由半导体壁组成，这些壁优先另外掺杂高导电材料，即金属颗粒。对于氧化物或硫化物纳米管的合成，需要合适的模板，它在自组织过程中定位金属氧化物前体。为了引入第二种金属，这种金属可以穿透壁面，从而提高壁面的导电性，我们的方法包括使用金属盐纳米纤维作为结构导向剂。该项目将侧重于开发合适的金属盐纳米纤维，创建新型半导体无机纳米管，以及金属掺杂氧化物(如二氧化硅、二氧化锡和二氧化钛)或硫化物(如二氧化锡)纳米管的各向异性电子性质。将开发用于单纳米管电导率测量的电极布置。电导将作为温度、栅极电压和磁场的函数进行测量，并将建立解释这些复合材料中电子跳跃的模型。

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.