(a) SEM image of Ag nanocubes. SAED (selected area electron diffraction) pattern obtained from TEM studies is given in the inset. Reproduced from ref. 30 with permission from American Chemical Society, Copyright 2004; (b) SEM image of silver NWs with a pentagonal cross-section. Adapted from ref. 32 with permission from American Chemical Society, Copyright 2003; (c) SEM images of Ag bipyramids. Adapted from ref. 33 with permission from American Chemical Society, Copyright 2006.