Predicting Nanocrystal Shape through Consideration of Surface-Ligand Interactions

Clive R. Bealing, William J. Baumgardner, Joshua J. Choi, Tobias Hanrath, Richard G. Hennig

Research output: Contribution to journalArticlepeer-review

168 Scopus citations

Abstract

Density functional calculations for the binding energy of oleic acid-based ligands on Pb-rich {100} and {111} facets of PbSe nanocrystals determine the surface energies as a function of ligand coverage. Oleic acid is expected to bind to the nanocrystal surface in the form of lead oleate. The Wulff construction predicts the thermodynamic equilibrium shape of the PbSe nanocrystals. The equilibrium shape is a function of the ligand surface coverage, which can be controlled by changing the concentration of oleic acid during synthesis. The different binding energy of the ligand on the {100} and {111} facets results in different equilibrium ligand coverages on the facets, and a transition in the equilibrium shape from octahedral to cubic is predicted when increasing the ligand concentration during synthesis. © 2012 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)2118-2127
Number of pages10
JournalACS Nano
Volume6
Issue number3
DOIs
StatePublished - Feb 29 2012
Externally publishedYes

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