금속이온/유기용매 혼합물의 전기방사를 통한 정렬된 나노 구조물의 제조

Abstract

This thesis demonstrates that aligned Ni-Fe-O nanostructures could be prepared by electrospinning of metal ion/polymer mixture solution. Metal alkoxide (Ni-OR, Fe-OR) and inorganic (NiCl₂, FeCl₃) precursors were used as metal ion sources and poly vinyl(pyrrolydone)(PVP) was used as a stabilizer of the solution. The mixture of dimethylformamide and ethanol was used as solvent. A “rotating drum”, which covered with aluminum foil, used as a collector to deposit highly ordered nanofibers. The diameter of the spun fibers depended on viscosity and spinning voltage. The diameter of the electrospun Ni-Fe-O fiber could be reduced down to ～ 50 nm. The electrospun metal/polymer nanofibers could be converted to aligned magnetic nanoparticles at 700 ℃ under air and nitrogen. The resulted magnetic Ni-Fe-O nanostructures show superparamagnetic-ferromagnetic transition at around room temperatures (290 K ～ 350 K). This suggests that the magnetic nanostructures could be used as the noble magnetic recording material.