YBCO superconducting nanotubes synthesized by electrospinning technique

Reference	Presenter	Authors (Institution)	Abstract
12-060	Diego Anísio Modesto	Modesto, D.A.(Universidade Federal do ABC); Medina, M.S.(Universidade Federal do ABC); Bernardi, J.C.(Universidade Federal do ABC); Lanfredi, A.J.(Universidade Federal do ABC); Escote, M.T.(Universidade Federal do ABC);	It is well known that the materials, such as superconductors, exhibit unique physical properties when the dimensions are reduced to the nanoscale. The basic superconducting quantities, for example, the order parameter, energy gap, critical temperature and vortex dynamics can be affect by the different geometries, in particular nanotube. This hollow nanostructure has potential for applications in nanodevices, however their quantum-size effects are still not well understood. Several methodologies have been developed for synthesize nanostructures, one of them is the electrospinning technique. The aim of this work is studying the parameters for electrospun nanotubes of YBCO superconducting ceramic. The sol-gel was prepared by a stoichiometric ratio of yttrium, barium and copper acetates as precursors and solubilized in a mixture of methanol, organic acids and polymer (PVP). There was used different sol-gel viscosities for electrospinning the nanostructures. The heat treatment was performed using a tube furnace with oxygen flow and the nanostructures were obtained at different temperatures, 800 – 930°C. The morphology was investigated using a field emission scanning electron microscope (FESEM) and the orthorhombic YBCO crystallographic phase was determined by Mo-K? powder X-ray diffraction (XRD).
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