Self-assembled template-confined growth of ultrathin CsPbBr3 nanowires

Fabrication of ultrathin ( e.g. , ∼2 nm) CsPbBr 3 nanowires is still challenging for existing methods, for the extremely fast crystal growth process of CsPbBr 3 . Here, we developed a self-assembled nanotemplate-confined growth concept to prepare ultrathin CsPbBr 3 nanowires. During electrospinning using the N , N -dimethylformamide (DMF) solution composed of polymethyl methacrylate (PMMA), PbBr 2 , 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 CsPbBr 3 nanowires were prepared after DMF evaporation. The CsPbBr 3 nanowires within the PMMA fibers or dispersed in toluene showed bright blue luminescence. The structure of the CsPbBr 3 products could be adjusted by the stirring time, as well as the amount of PMMA, PbBr 2 , and CsBr in DMF. Overall, we developed a new method towards engineering ultrafine CsPbBr 3 nanostructure through self-assembled template-confined growth concept during electrospinning, which may find potential applications in blue light emitting diodes and other optoelectronic devices.