Site-Specific Ligand Interactions Favor the Tetragonal Distortion of PbS Nanocrystal Superlattices

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Authors

NOVÁK Jiří BANERJEE Rupak KORNOWSKI Andreas JANKOWSKI Maciej ANDRE Alexander WELLER Horst SCHREIBER Frank SCHEELE Marcus

Year of publication 2016
Type Article in Periodical
Magazine / Source ACS APPLIED MATERIALS & INTERFACES
MU Faculty or unit

Faculty of Science

Citation
Web Odkaz na webovou stránku vydavatele.
Doi http://dx.doi.org/10.1021/acsami.6b06989
Field Solid matter physics and magnetism
Keywords nanocrystals; self-assembly; X-ray scattering; electron microscopy; mesocrystals
Description We analyze the structure and morphology of mesocrystalline, body-centered tetragonal (bct) superlattices of PbS nanocrystals functionalized with oleic acid. On the basis of combined scattering and real space imaging, we derive a three-dimensional (3D) model of the superlattice and show that the bct structure benefits from a balanced combination of {100}(PbS)-{100}(PbS) and {111}(PbS)-{111}(PbS) interactions between neighboring layers of nanocrystals, which uniquely stabilizes this structure. These interactions are enabled by the coaxial alignment of the atomic lattices of PbS with the superlattice. In addition, we find that this preferential orientation is already weakly present within isolated monolayers. By adding excess oleic acid to the nanocrystal solution, tetragonal distortion is suppressed, and we observe assembly into a bilayered hexagonal lattice reminiscent of a honeycomb with grain sizes of several micrometers.
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