Figure 1.

FF-SEM images of nanopowder with different morphologies after hydrothermal process described in Table 1. a specimen No. 1, b specimen No. 2, c specimen No. 3 and d specimen No. 4, respectively

Ahn et al. Nanoscale Research Letters 2010 5:1841-1845   doi:10.1007/s11671-010-9722-y