Conjugate electro-spinning towards Janus nanofibers array synchronously endowed with conductive anisotropy, magnetism and luminescence

Abstract

An unpolymerized [Tb(BA) 3 phen (TBP)/polymethylmethacrylate (PMMA)]//[aniline (ANI)/Fe 3 O 4 /PMMA] Janus nanofibers array (UJNA) is successfully prepared by conjugate electro-spinning technique, and a polymerized [TBP/PMMA]//[polyaniline (PANI)/Fe 3 O 4 /PMMA] Janus nanofibers array (PJNA) with tunable conductive anisotropy, tailored magnetism and enhancive green luminescence is prepared by post-polymerization method. Using conjugate electro-spinning can prevent the problem of mutual diffusion between spinning dopes and realize the effective separation of luminescent substances form conductive-magnetic substances. Meanwhile, Janus nanofibers have a directional arrangement that can reduce light loss during excitation and emission. Therefore, compared with comparison samples, the PJNA prepared by conjugate electro-spinning has the strongest luminescence intensity. PJNA can be composed and contained different amounts of luminescent-conductive-magnetic (LCM) substances to adjust its LCM properties. As PANI mass ratio exceeds 70%, the sample's conductivity in the conductive direction exceeds that in the insulation direction by 10 7 times. The PJNA assembled in this work has potential applications in drug delivery, dual-mode imaging, electromagnetic shielding and nanodevices due to its excellent multifunctional properties. Further, this technology can also be applied to other multifunctional one-dimensional Janus nanomaterials and two-dimensional films. • Janus nanofibers array is prepared by conjugate electrospinning and post-polymerization. • Janus nanofibers (JNs) array owns conductive anisotropy, magnetism and luninescence. • Conjugate electrospinning is superior to parallel electrospinning in making JNs. • Partitioned structures guarantee strong luminescence and high conductive anisotropy. • Other multifunctional nanomaterials can be constructed using these techniques.