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Multilayer Diffraction Reveals That Colloidal Superlattices Approach the Structural Perfection of Single Crystals

preprint
submitted on 18.10.2020, 12:58 and posted on 19.10.2020, 12:35 by Stefano Toso, Dmitry Baranov, Davide Altamura, Francesco Scattarella, Jakob Dahl, Xingzhi Wang, Sergio Marras, Paul Alivisatos, Andrej Singer, Cinzia Giannini, Liberato Manna
Colloidal superlattices are fascinating materials made of ordered nanocrystals, yet they are rarely called “atomically precise.” That is unsurprising, given how challenging it is to quantify the degree of structural order in these materials. However, once that order crosses a certain threshold, constructive interference of X-rays diffracted by the nanocrystals dominates the diffraction pattern, offering a wealth of structural information. By treating nanocrystals as scattering sources forming a self-probing interferometer, we developed a multilayer diffraction method that enabled the accurate determination of nanocrystal size, interparticle spacing, and their fluctuations for samples of self-assembled CsPbBr3 and PbS nanomaterials. The average nanocrystal displacement of 0.32-1.4 Å in the studied superlattices provides a figure of merit for their structural perfection and approaches the atomic displacement parameters found in traditional crystals. The method requires a laboratory-grade diffractometer and an open-source fitting algorithm for data analysis, providing a competitive alternative to resource-intensive synchrotron experiments.

Funding

Routing Energy Transfer via Assembly of Inorganic Nanoplatelets

European Commission

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Colloidal Nanomaterials for Smart Applications

European Commission

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U.S. DOE DEAC02-05-CH11231

Graduate Research Fellowship Program (GRFP)

Directorate for Education & Human Resources

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Energie per l’Ambiente TARANTO ARS01_00637

History

Email Address of Submitting Author

dmitry.baranov@iit.it

Institution

Italian Institute of Technology

Country

Italy

ORCID For Submitting Author

0000-0001-6439-8132

Declaration of Conflict of Interest

The authors declare no conflict of interest.

Version Notes

version 01

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