Figure 4.

Typical SEM image of the 3-D superlattice of Pd NPs. (a) SEM image of superlattice crystals formed by as-prepared Pd NPs with the size of about 8 nm, (b) single superlattice crystal with octahedron shape, (c) exposed surfaces arranged by close-packed nanocrystals, (d) magnified step surface.

Zhang et al. Nanoscale Research Letters 2012 7:312   doi:10.1186/1556-276X-7-312
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