Figure 2.

FESEM images for RT synthesized MnO2:alow magnification andbhigh magnification,cschematic illustration for the possible formation mechanism of dandelion-like MnO2microspheres, FESEM images for 80 °C synthesized MnO2:dlow magnification andehigh magnification, andfschematic illustration for the possible formation mechanism of MnO2nanoflakes

Xia et al. Nanoscale Research Letters 2009 4:1035-1040   doi:10.1007/s11671-009-9352-4