Figure 3.

aLow magnification FEG-SEM micrograph of several rice-like HfO2nanostructures obtained by MH at 140 °C for 1 h;b, cHigh magnification FEG-SEM micrographs of a group of rice-like nanostructures;d, eLow magnification TEM micrographs of aggregated HfO2nanostructures; Inset in (e) shows the EDXS spectrum of HfO2nanostructures; andfHR-TEM micrograph of an individual nanoparticle selected in (e) (black rectangle). Inset in (f) show the corresponding Fourier-transform obtained on this region

Eliziário et al. Nanoscale Research Letters 2009 4:1371-1379   doi:10.1007/s11671-009-9407-6