Fabrication of magnetic-luminescent bifunctional composite nanofibers via facile electrospinning

摘要

Fe_3O_4/Eu(BA)_3phen/polyvinyl pyrrolidone (PVP) magnetic-luminescent bifunctional composite nanofibers have been successfully fabricated based on ferroferric oxide (Fe_3O_4) nanoparticles (NPs) and europium complexes Eu(BA)_3phen (BA = benzoic acid, phen = phenanthroline) via electrospinning technology. The as-prepared samples were characterized by X-ray diffractometry, field-emission scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, fluorescence spectroscopy and vibrating sample magnetometry. The as-prepared Fe_3O_4/Eu(BA)_3-phen/PVP composite nanofibers possess good fibrous morphology, and Fe_3O_4 NPs are evenly dispersed into nanofibers. Under the excitation of 274-nm ultraviolet light, Fe_3O_4/Eu(BA)_3phen/PVP composite nanofibers exhibit red emissions of predominant peaks at 592 and 616 nm, which are respectively attributed to the ~5D_0 → ~7F_1 and ~5D_0 → ~7F_2 energy levels transitions of Eu~(3+) ions. The optimum mass percentage of Eu(BA)_3phen to PVP is 15 %. The fluorescence intensity of composite nanofibers is decreased when more Fe_3O_4 NPs were added. The saturation magnetization is increased with the increase of Fe_3O_4 NPs, indicating that the magnetism of the composite nanofibers can be tuned by adjusting Fe_3O_4 NPs content. The magnetic-luminescent bifunctional composite nanofibers are expected to apply in the fields of cell separation and biological labeling imaging, etc.