Figure 14.

a Schematic illustration of the evolvement process of Si porous nanocapsules with NH3 as bubble template; b low-magnification SEM image of Si hollow nanocapsules; c high-magnification SEM image of a typical broken Si hollow nanocapsules; d TEM image of Si hollow nanocapsules [53]. Copyright Wiley–VCH Verlag Gmbh & Co. KGaA. Reproduced with permission

Liu and Xue Nanoscale Research Letters 2010 5:1525-1534   doi:10.1007/s11671-010-9728-5