Fig. 4

The FESEM image for (a, a*) PVPbMC0, (b, b^*) PVPbMC1, (c, c^*) PVPbMC2 and (d, d^*) PVPbMC3 films. The letters a, b, c and d represent the FESEM images at 1 kx magnification for the pure PVA and PVA composite films, while a*, b*, c*, and d* represent the FESEM images at 3 kx magnifications for the same films.