Stress-Induced Structural Phase Transition in Polystyrene/NaYF₄: Eu³⁺ Photoluminescent Electrospun Nanofibers

Figure 4

The SEM pictures of PS composite nanofibers at 5% with different flow rates (a) 0.1 ml/h, (b) 0.15 ml/h, (c) 0.2 ml/h and (d) 0.3 ml/h.

(a)

(b)

(c)

(d)