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In this letter, we report the competing growth of a Pd shell on the 110 and 100 facets of Au nanorods (Au NRs). This results in the disappearance of unstable 110 facets and the formation of rectangularly shaped Pd/Au bimetallic nanorods that show only four stable 100 side surfaces. The energy minimization to a more stable morphology is believed to be the driving force for the formation of the rectangular shape of the Pd shell.
Xiang et al. (Fri,) studied this question.