journal article·2016-08-31

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

Jiřı́ Novák, Rupak Banerjee, Andreas Kornowski, Maciej Jankowski, Alexander André, Horst Weller, Frank Schreiber, Marcus Scheele

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Abstract

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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Research context

OpenAlex topics: Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films · Copper-based nanomaterials and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic

Department of Condensed Matter Physics, Masaryk University, Kotlářská 2, CZ-61137 Brno, Czech Republic

Department of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar 382355, India

Institute of Physical Chemistry and The Hamburg Centre for Ultrafast Imaging, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany

Beamline ID03, European Synchrotron Radiation Facility, Grenoble F-38043, France

Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany

Institute of Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany

Center for Light−Matter Interaction, Sensors & Analytics, University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany

Funding

Deutsche Forschungsgemeinschaft · Ministry of Education, Youth and Sports of the Czech Republic · Baden-Wuerttemberg Stiftung

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