Figure 2

SEM micrograph of (a) PU/PAN (b) PU/PAN/ZnA-5, (c) PU/PAN/ZnA-10, (d) PU/PAN/ZnA-15, (e) PU/PAN/ZnS-5, (f) PU/PAN/ZnS-10, (g) PU/PAN/ZnS-15, (h) PU/PAN/ZnT-5, (i) PU/PAN/ZnT-10, (j) PU/PAN/ZnT-15, and (k) plot of fiber diameter of PU/PAN/ZnX-y, and Zn elemental mapping of (l) PU/PAN/ZnA-15, (m) PU/PAN/ZnS-15, and (n) PU/PAN/ZnT-15.