Template based fabrication and electrical conductivity of metal doped oxide nanotubes and thin metal nanowires

导电纳米管和纳米线在纳米电子学的许多方面都是非常有吸引力的材料。因此，适用的纳米管必须由半导体壁组成，其优选地另外掺杂有能够实现电子跳跃传输的金属颗粒。通过采用金属盐纳米纤维作为模板结构，我们开发了一种基于溶胶-凝胶的涂覆路线，以在管内部和管壁中涂覆含有金属纳米颗粒的金属氧化物纳米管。因此，Pt掺杂的TiO 2纳米管，从溶液中沉淀，表现出高达800的纵横比。由于模板盐纤维已经显示出导电性，我们现在将用金属醇盐或用预形成的金属氧化物纳米颗粒在基底上涂覆接触的Pt [NH3] 4（HCO3）2纳米纤维。将阐述电场对涂层的影响以及金属氧化物层生长和纳米管壁中晶界的形成对复合材料导电性的影响。将测量它们的电导作为温度和栅极电压的函数，以开发盐纳米纤维和复合材料中的电子跳跃模型。进一步的目的涉及在氧化物纳米管或介孔氧化物中形成金属纳米线，以及将氧化物纳米管转化为半导体非氧化物纳米管。

Conductive nanotubes and nanowires are highly attractive materials for many aspects of nanoelectronics. Thus applicable nanotubes must consist of semiconducting walls, which are preferably additionally doped with metal particles enabling electron hopping transport. By employing metal salt nanofibres as templating structures we developed a sol-gel based coating route to metal oxide nanotubes containing metal nanoparticles as well in the tube interior as in the walls. Thus Pt-doped TiO2 nanotubes, precipitated from solution, exhibit aspect ratios up to 800. Since already the templating salt fibers showed electric conductivity we will now coat contacted Pt[NH3]4(HCO3)2 nanofibers on substrates either with metal alkoxides or with pre-formed metal oxide nanoparticles. The influences of electric fields on the coating and the effects of the metal oxide layer growth and the formation of grain boundaries in the nanotube walls on the conductivity of the composites will be elaborated. Their conductance will be measured as function of temperature and gate voltage in order to develop models for the electron hopping in the salt nanofibres and the composites. Further aims concern the formation of metal nanowires in the oxide nanotubes or in meso-porous oxides and the transformation of the oxide nanotubes into semiconducting non-oxide ones.