Figure 1From: Diameter control of ultrathin zinc oxide nanofibers synthesized by electrospinningSEM images of the ZnO-PVP composite structure electrospun from a mixture of ZnO sol–gel and PVP solution. Concentrations of zinc acetate are 0.1 M (top row), 0.4 M (middle row), and 0.75 M (bottom row); those of the PVP solution are 0.02, 0.04, and 0.06 g/mL from the left to the right column, respectively.Back to article page