title: Three-dimensional atomic imaging of colloidal core-shell nanocrystals.
abstract: Colloidal core-shell semiconductor nanocrystals form an important class of optoelectronic materials, in which the exciton wave functions can be tailored by the atomic configuration of the core, the interfacial layers, and the shell. Here, we provide a trustful 3D characterization at the atomic scale of a free-standing PbSe(core)-CdSe(shell) nanocrystal by combining electron microscopy and discrete tomography. Our results yield unique insights for understanding the process of cation exchange, which is widely employed in the synthesis of core-shell nanocrystals. The study that we present is generally applicable to the broad range of colloidal heteronanocrystals that currently emerge as a new class of materials with technological importance.
authors.affiliation: EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium. Sara.Bals@ua.ac.be
authors.forename: Sara
authors.initials: S
authors.lastname: Bals
authors.forename: Marianna
authors.initials: M
authors.lastname: Casavola
authors.forename: Marijn A
authors.initials: MA
authors.lastname: van Huis
authors.forename: Sandra
authors.initials: S
authors.lastname: Van Aert
authors.forename: K Joost
authors.initials: KJ
authors.lastname: Batenburg
authors.forename: Gustaaf
authors.initials: G
authors.lastname: Van Tendeloo
authors.forename: Daniël
authors.initials: D
authors.lastname: Vanmaekelbergh