Tuned magnetism–luminescence bifunctionality simultaneously assembled into flexible Janus nanofiber

Abstract

A new structure of [CoFe₂O₄/PVP]//[YAG:5%Eu³⁺/PVP] magnetic–luminescent bifunctional Janus nanofibers has been successfully fabricated via electrospinning technology using a homemade parallel spinneret. Electrospinning-derived YAG:5%Eu³⁺ luminescent nanofibers and CoFe₂O₄ magnetic nanofibers are incorporated into polyvinyl pyrrolidone (PVP) matrix and electrospun into Janus nanofibers with CoFe₂O₄ magnetic nanofibers/PVP as one strand nanofiber and YAG:5%Eu³⁺ luminescent nanofibers/PVP as another strand nanofiber. [CoFe₂O₄/PVP]//[YAG:5%Eu³⁺/PVP] magnetic–luminescent bifunctional Janus nanofibers possess superior magnetic and luminescent properties due to their special nanostructure, and the luminescent characteristics and saturation magnetizations of the Janus nanofibers can be tuned by adding various amounts of YAG:5%Eu³⁺ luminescent nanofibers and CoFe₂O₄ magnetic nanofibers. Compared with CoFe₂O₄/YAG:5%Eu³⁺/PVP composite nanofibers, the magnetic–luminescent bifunctional Janus nanofibers provide higher performances due to the isolation of YAG:5%Eu³⁺ luminescent nanofibers from CoFe₂O₄ magnetic nanofibers. More importantly, the design conception and construction technology are of universal significance to fabricate other bifunctional Janus nanofibers.