Fabrication and characterization of superconducting nanowires and nanowire networks by electrospinning

本项目旨在探讨超导纳米线的性能和静电纺丝制备的高温超导体非织造纳米线网络。通过这种方法，可以制造直径为150-200纳米的长纳米线（最大100微米），从而可以进行超导特性的基础研究。此外，纳米线的生长，织物状的非织造纳米线网络形成了一类新的超导材料，这将被详细探讨。单个纳米线（通过FIB铣削从网络中切割）的基本超导特性将通过传输和磁测量来研究。在这里，使用悬臂磁强计的磁测量将首次启用，因为没有衬底和触点垫，这将干扰磁数据。纳米线网络的超导特性将通过角度相关输运测量和磁性测量来探索，以研究织物状结构中众多互连的（磁性）特性。将采用两种方法对磁化数据进行建模，以确定临界电流密度和其他特性，如磁通钉住力、不可逆性场和钉住势。这些分析的目的是获得这种新材料的完整图像，以便判断这种轻质材料的可能应用。

The present project aims to explore the properties of superconducting nanowires and the non-woven nanowire-networks of high-Tc superconductors produced by means of electrospinning. In this way, long nanowires (up to 100 µm) with diameters of 150-200 nm can be fabricated, allowing basic reasearch of the superconducting properties. Additionally, the as-grown, fabric-like non-woven nanowire networks of the nanowires form a new class of superconducting material, which will be explored in detail.The basic superconducting properties of individual nanowires (cut from the networks by FIB milling) will be studied by transport and magnetic measurements. Here, magnetic measurements using cantilever magnetometers will be enabled for the first time, as there is no substrate and no contact pads which will disturb the magnetic data. The superconducting properties of the nanowire networks will be explored by angle-dependent transport measurements and magnetic measurements in order to study the (magnetic) properties of the numerous interconnects within the fabric-like structure. Modelling of the magnetization data using two approaches will be carried out in order to determine the critical current densities and other properties like the flux pinning forces, the irreversibility fields and the pinning potential. The goal of these analyses is to obtain a complete picture of this new material in order to judge about possible applications of this light-weight material.