fig1

Figure 1. (A-D) TEM images of a single CPB/PVDF nanocomposite fiber with increasing CPB weight fraction: (A) 3 wt.%; (B) 4 wt.%; (C) 5 wt.%; (D) 6 wt.%. The dash circles indicate the CPB nanorods. (E) Schematic illustration on the in situ growth mechanism of CPB from nanoparticles to 1D nanorods. CPB: CsPbBr₃; PVDF: poly(vinylidene fluoride).