Figure 1.

SEM images of the top surfaces of Fe foils heated for 15 h at 260 °C.Insetshows the high-magnification SEM images of the nanoflake tip and thecircleshows the radius of curvature at the nanoflake tip

Zheng et al. Nanoscale Research Letters 2009 4:1115-1119   doi:10.1007/s11671-009-9363-1