Ligand-Induced Shape Transformation of PbSe Nanocrystals

Joep L Peters, Karel H.W. Van Den Bos, Sandra Van Aert, Bart Goris, Sara Bals, Daniël Vanmaekelbergh

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We present a study of the relation between the surface chemistry and nanocrystal shape of PbSe nanocrystals with a variable Pb-to-Se stoichiometry and density of oleate ligands. The oleate ligand density and binding configuration are monitored by nuclear magnetic resonance and Fourier transform infrared absorbance spectroscopy, allowing us to quantify the number of surface-attached ligands per NC and the nature of the surface-Pb-oleate configuration. The three-dimensional shape of the PbSe nanocrystals is obtained from high-angle annular dark field scanning transmission electron microscopy combined with an atom counting method. We show that the enhanced oleate capping results in a stabilization and extension of the {111} facets, and a crystal shape transformation from a truncated nanocube to a truncated octahedron.

Original languageEnglish
Pages (from-to)4122-4128
Number of pages7
JournalChemistry of Materials
Volume29
Issue number9
DOIs
Publication statusPublished - 2017

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