Flexible Janus Nanofiber to Help Achieve Simultaneous Enhanced Magnetism-Upconversion Luminescence Bifunction


Novel versatile Janus nanofibers with magnetism-upconversion luminescence bifunction are successfully fabricated via electrospinning technology using a homemade parallel spinneret. NaYF4:Yb3+, Er3+ and Fe3O4 nanoparticles (NPs) were, respectively, incorporated into polyvinyl pyrrolidone (PVP) and electrospun into Janus nanofibers with NaYF4:Yb3+, Er three+/PVP together strand nanofiber of the Janus nanofiber and Fe3O4/PVP as the opposite one. The morphologies and properties of the final product were investigated very well by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, energy dispersive spectrometry, vibrating sample magnetometry and fluorescence spectroscopy. The results reveal that Janus nanofibers simultaneously possess superior magnetic and upconversion luminescent properties because of their special nanostructure, and also the upconversion luminescent characteristics and saturation magnetizations of the Janus nanofibers will be tuned by adjusting the content of NaYF 4:Yb3+, Er3+ NPs and Fe3O4 NPs. Compared with Fe3 O4/NaYF4:Yb3+, Er3+/PVP composite nanofibers, the magnetism-upconversion luminescence bifunctional Janus nanofibers offer higher performances attributable to isolating NaYF four:Yb3+, Er3+ NPs from Fe3O4 NPs. The novel magnetism-upconversion luminescence bifunctional Janus nanofibers have potential applications in the fields of recent nano-bio-label materials, drug target delivery materials and future nanodevices because of their wonderful magnetic-upconversion luminescent properties, flexibility and peculiar nanostructure. More importantly, the new strategy and construction technology - re of universal significance to fabricate different bifunctional Janus nanofibers.

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