Self-assembled template-confined growth of ultrathin CsPbBr3 nanowires

Abstract

Fabrication of ultrathin (e.g., ∼2 nm) CsPbBr3 nanowires is still challenging for existing methods, for the extremely fast crystal growth process of CsPbBr3. Here, we developed a self-assembled nanotemplate-confined growth concept to prepare ultrathin CsPbBr3 nanowires. During electrospinning using the N,N-dimethylformamide (DMF) solution composed of polymethyl methacrylate (PMMA), PbBr2, CsBr, and capping agents, PMMA chains would assemble into nanochannels acting as nanotemplates within the electrospun PMMA fibers. Owing to the very limited amount of precursors within the nanochannels, ultrathin CsPbBr3 nanowires were prepared after DMF evaporation. The CsPbBr3 nanowires within the PMMA fibers or dispersed in toluene showed bright blue luminescence. The structure of the CsPbBr3 products could be adjusted by the stirring time, as well as the amount of PMMA, PbBr2, and CsBr in DMF. Overall, we developed a new method towards engineering ultrafine CsPbBr3 nanostructure through self-assembled template-confined growth concept during electrospinning, which may find potential applications in blue light emitting diodes and other optoelectronic devices.