Facile Conjugation Electrospinning Construction of Core-shell Structured Nanofiber Yarns Displaying Synchronous Up-conversion and Conduction Bi-functionality

Abstract

Up-conversion luminescent-conductive bi-functional core-shell yarns (shorted as CSYs) were successfully synthesized utilizing conjugation electrospinning technology. This specially designed CSYs are composed of two kinds of electrospun fibers. The up-conversion luminescent electrospun fibers (ULEFs) containing NaYF4: Yb3+, Er3+ up-conversion luminescent nanoparticles (ULNPs) are located in the shell layer and conductive electrospun fibers (CEFs) containing polyaniline (PANI) composes the shell layer. The diameters of CSYs and the nanofibers therein are ca. $475\ \mu\mathrm{m}$ and 735.5±1.19 nm respectively. The EDS element mapping indicates obvious core-shell structure of the obtained CSYs. CSYs exhibit tunable up-conversion luminescent intensity and conductivity by modulating the doping mass of ULNPs and PANI respectively. CSYs synthesized in this work are one of the excellent candidates for intelligent fabrics, anti-counterfeiting materials and electrical devices. Additionally, the particular designing concept and the assembling mechanism of the CSYs are widely expanded to other poly-functional yarns.