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，半导体壁最好另外掺杂金属颗粒，从而实现电子跳跃传输。通过使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-凝胶的金属氧化物纳米管涂层路线，其中包含金属纳米颗粒，并且在管内部和管壁中都含有金属纳米颗粒。因此，从溶液中析出的pt掺杂TiO2纳米管的纵横比高达800。由于模板盐纤维已经显示出导电性，我们现在将接触的Pt[NH3]4(HCO3)2纳米纤维涂覆在金属烷氧化物或预先形成的金属氧化物纳米颗粒的衬底上。本文将阐述电场对涂层的影响，以及纳米管壁中金属氧化层的生长和晶界的形成对复合材料电导率的影响。它们的电导率将作为温度和栅极电压的函数进行测量，以便建立盐纳米纤维和复合材料中电子跳变的模型。进一步的目标是在氧化物纳米管或介孔氧化物中形成金属纳米线，并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.