Figure 2.

Some relevant atomic sites. Pictorial view of (a) a nanodisk center, (b) a one-pentagon nanocone apex, and (c) a two-pentagon nanocone apex. Atoms with different colors/numbers indicate different point symmetries for each system.

Ulloa et al. Nanoscale Research Letters 2013 8:384   doi:10.1186/1556-276X-8-384
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