부산대학교 도서관

Abstract: Tetragonal copper ferrite (CuFe2O4) nanofibers were fabricated by electrospinning method using a solution that contained poly(vinyl pyrrolidone) (PVP) and Cu and Fe nitrates as alternative metal sources. The as-spun and calcined CuFe2O4/PVP composite samples were characterized by TG-DTA, X-ray diffraction, FT-IR, and SEM, respectively. After calcination of the as-spun CuFe2O4/PVP composite nanofibers (fiber size of 89±12nm in diameter) at 500°C in air for 2h, CuFe2O4 nanofibers of 66±13nm in diameter having well-developed tetragonal structure were successfully obtained. The crystal structure and morphology of the nanofibers were influenced by the calcination temperature. After calcination at 600 and 700°C, the nature of nanofibers changed which was possibly due to the reorganization of the CuFe2O4 structure at high temperature, and a fiber structure of packed particles or crystallites was prominent. Crystallite size of the nanoparticles contained in nanofibers increases from 7.9 to 23.98nm with increasing calcination temperature between 500 and 700°C. Room temperature magnetization results showed a ferromagnetic behavior of the calcined CuFe2O4 samples, having their specific saturation magnetization (M s) values of 17.73, 20.52, and 23.98emu/g for the samples calcined at 500, 600, and 700°C, respectively. [Copyright &y& Elsevier]