Abstract
Multifunctional Fe3O4/Eu(DBM)3phen/PVP ((DBM: dibenzoylmethane, phen: 1,10-phenanthroline, PVP: polyvinyl pyrrolidone) microfibers were constructed by simple electrospinning process. The structure and morphology of the microfibers were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. The diameters of pure PVP microfibers and the microfibers doped only with Fe3O4 nanoparticles (NPs) were uniformly distributed, with an average diameter of about 360 nm. When 3% Eu(DBM)3phen complex and Fe3O4 NPs were both added to the precursor for electrospinning, the microfibers became very inhomogeneous in diameter. The photoluminescent properties of pure Eu(DBM)3phen complex and composite microfibers were also studied. The characteristic emission peaks of Eu3+ appeared in the composite microfibers. The intensities of emission and excitation spectra gradually decrease with adding more Fe3O4 NPs. The unit mass of the pure europium complex in some composite microfibers gave stronger luminescence than the pure europium complex. The fluorescence lifetime of 5D0 state in the composite microfibers is longer than that of pure europium complex. Additionally, the magnetic properties of Fe3O4 NPs and the composite microfibers were investigated. The saturation magnetization of the composite microfibers was smaller than that of pure Fe3O4 NPs.
Highlights
With the increasing demand for integrated devices, single functional materials have been difficult to meet the needs of modern science and technology
When 3% Eu(DBM)3phen complex and Fe3O4 NPs were both added to the precursor for electrospinning, the microfibers became very inhomogeneous in diameter
PVP microfibers doped with Fe3O4 NPs and Eu(DBM)3phen complex were prepared via electrospinning technique. the structure, photoluminescent and magnetic properties of the multifunctional microfibers were investigated in detail, and some significant results were obtained
Summary
With the increasing demand for integrated devices, single functional materials have been difficult to meet the needs of modern science and technology. Multifunctional composites including biomedicine, environmental protection, material science, and many other fields have gradually aroused more and more interests among scientists [1,2,3] Among such composites, multifunctional luminescent-magnetic composites simultaneously possess excellent magnetism and luminescence, and have been widely used in biomedical applications such as magnetic resonance imaging (MRI), targeted drug delivery, cell labeling and separation [4,5,6]. Organic dyes, quantum dots and rare earth complexes have been employed as luminescent materials in the luminescent-magnetic composites. PVP microfibers doped with Fe3O4 NPs and Eu(DBM)3phen complex were prepared via electrospinning technique. The preparative technique can be extended to fabricate other multifunctional composites
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