Mechanistic Insights into Superlattice Transformation at a Single Nanocrystal Level Using Nanobeam Electron Diffraction
| Autor: | Jessica Cimada daSilva, Daniel M. Balazs, Yuanze Xu, Michelle A. Smeaton, Lena F. Kourkoutis, Tyler Allan Dunbar, Tobias Hanrath |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering Superlattice Bioengineering Nanotechnology 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electron diffraction Nanocrystal Transmission electron microscopy Mechanism (philosophy) General Materials Science Self-assembly 0210 nano-technology |
| Zdroj: | Nano letters. 20(7) |
| ISSN: | 1530-6992 |
| Popis: | Understanding the mechanism and ultimately directing nanocrystal (NC) superlattice assembly and attachment have important implications on future advances in this emerging field. Here, we use 4D-STEM to investigate a monolayer of PbS NCs at various stages of the transformation from a hexatic assembly to a nonconnected square-like superlattice over large fields of view. Maps of nanobeam electron diffraction patterns acquired with an electron microscope pixel array detector (EMPAD) offer unprecedented detail into the 3D crystallographic alignment of the polyhedral NCs. Our analysis reveals that superlattice transformation is dominated by translation of prealigned NCs strongly coupled along the11 |
| Databáze: | OpenAIRE |
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