Journal
SMALL
Volume 15, Issue 50, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201904954
Keywords
crystal defects; mesocrystals; nanoparticles; superlattices; X-ray scattering
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Funding
- DFG [SCHE1905/3, SCHE1905/4, SCHR700/25]
- Tomsk Polytechnic University Competitiveness Enhancement Program grant [VIU-MNOL NK-214/2018]
- Helmholtz Association's Initiative and Networking Fund
- Russian Science Foundation [HRSF-0002]
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X-ray nanodiffraction is applied to study the formation and correlation of domain boundaries in mesocrystalline superlattices of PbS nanocrystals with face-centered cubic structure. Each domain of the superlattice can be described with one of two mesocrystalline polymorphs with different orientational orders. Close to a grain boundary, the lattice constant decreases and the superlattice undergoes an out-of-plane rotation, while the orientation of the nanocrystals with respect to the superlattice remains unchanged. These findings are explained with the release of stress on the expense of specific nanocrystal-substrate interactions. The fact that correlations between adjacent nanocrystals are found to survive the structural changes at most grain boundaries implies that the key to nanocrystal superlattices with macroscopic domain sizes are strengthened interactions with the substrate.
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