Electrospun dual-aeolotropic conductive exceptive Janus membrane and Janus tubule functionalized by up-/down-converting fluorescence and magnetism

Abstract

A novel three-dimensional (3D) di-aeolotropic conductive special Janus tubule simultaneously functionalized by up-/down-converting fluorescence and magnetism was built by crimping a 2D special Janus membrane (SJM) obtained via electrospinning. The SJM consisted of a {[CoFe₂O₄/polymethylmethacrylate (PMMA)]@[poly(3,4-ethylenedioxythiophene) (PEDOT)/PMMA]}//[NaYF₄:Yb³⁺, Er³⁺/PMMA] special Janus microbelt array film with up-converting fluorescence (USJF) and a [PEDOT/PMMA]//[Tb(acac)₃bipy/PMMA] Janus microbelt array film with down-converting fluorescence (DJF). Microscopically, the Janus microbelt with USJF with a concentric//uniaxial structure and common Janus microbelt with DJF, as a building unit, could efficaciously confine various functional substances in their respective areas, averting reciprocal effects among conduction, magnetism, and luminescence to achieve enhanced fluorescence and strong aeolotropic conduction. Macroscopically, the SJM realized the portions of the up- and down-converting fluorescence regions, and the tight connection between USJF and DJF with single aeolotropism conductance made the SJM hold di-aeolotropic conduction. The high integration of the micro- and macro portions endowed the SJM and 3D Janus tubules with di-aeolotropic conduction, magnetism, and dual-mode fluorescence. Moreover, the fluorescence and conduction test results of the 3D tubules also highlighted their tremendous potential in flexible wearable electronic devices and sensors. The design concept and technology afford support for the ongoing development of polyfunctional structural materials.