Open AccessLigand-Induced Shape Transformation of PbSe Nanocrystals
Author(s) -
Joep L. Peters,
K.H.W. van den Bos,
Sandra Van Aert,
Bart Goris,
Sara Bals,
Daniël Vanmaekelbergh
Publication year - 2017
Publication title -
chemistry of materials
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 3.741
H-Index - 375
eISSN - 1520-5002
pISSN - 0897-4756
DOI - 10.1021/acs.chemmater.7b01103
Subject(s) - nanocrystal , absorbance , ligand (biochemistry) , stoichiometry , materials science , crystallography , transmission electron microscopy , fourier transform infrared spectroscopy , octahedron , spectroscopy , infrared , atom (system on chip) , infrared spectroscopy , chemistry , chemical physics , crystal structure , nanotechnology , optics , physics , organic chemistry , biochemistry , receptor , chromatography , quantum mechanics , computer science , embedded system
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.