Figure 2.

TEM images. (a) Au25, (b) Au25Pd with the inset showing the Pd nanocrystallites from the Pd shell, (c) Au50, (d) Au50Pd, (e) Au100, and (f) Au100Pd. The obvious dark/white contrast identified in the images of the Au nanospheres indicates that they are porous.

Hsu et al. Nanoscale Research Letters 2013 8:113   doi:10.1186/1556-276X-8-113
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