Fabrication and characterization of superconducting nanowires and nanowire networks by electrospinning

本计画旨在探讨利用静电纺丝技术所制造之超导奈米线及高温超导体之无纺网状结构之性质。通过这种方式，可以制造出直径为150-200 nm的长纳米线（高达100 µm），从而可以基本重新评估超导特性。此外，纳米线的纤维状非织造纳米线网络形成了一类新的超导材料，我们将详细研究这类材料。通过输运和磁性测量，将研究单个纳米线（通过FIB研磨从网络中切割下来）的基本超导性质。在这里，将首次启用使用悬臂式磁力计的磁性测量，因为没有会干扰磁性数据的基底和接触垫。纳米线网络的超导特性将通过角度相关的输运测量和磁测量来探索，以研究织物状结构内众多互连的（磁）特性。使用两种方法的磁化数据建模将进行，以确定临界电流密度和其他属性，如磁通钉扎力，不可逆性场和钉扎电位。这些分析的目的是获得这种新材料的全貌，以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.