|M.Sc Student||Greenberg Ya'akov|
|Subject||YBCO Nanofibers Synthesized By Electrospinning a Solution of|
Poly(acrylic acid) and Metal Nitrates
|Department||Department of Mechanical Engineering||Supervisor||Professor Eyal Zussman|
|Full Thesis text|
One of the most actively studied high temperature superconductor ceramics (HTSC) materials is YBCO (YB2Cu3O7-δ). In this research project a versatile approach to the synthesis of YBCO nanofibers was developed. YBCO nanofibers were synthesized by pyrolysis of nanofibers generated by electrospinning a polymer precursor solution containing poly(acrylic acid) and a mixture of metal nitrates. Typical YBCO nanofibers were 50-100 nm in diameter and around of 10 m length. The nanofibers also contain relatively small amounts of yttrium oxide and copper yttrium oxide.
Microstructure of these nanofibers was studied with the aid of various characterization techniques (TEM, TGA, X-ray, EDS, and EELS) and compared with the microstructure reported in the literature.
The main findings of this research are:
1. The nanofibers contained YB2Cu3O6.8 as main phase, with polycrystalline
2. By incorporation of calcium into the polymer solution from which the
nanofibers is produced a Single crystal nanofiber is created.
3. Controlling the nanofiber formation can be optimized by controlling the
decomposition stages through a correct temperature regime.