X-ray studies bridge the molecular and macro length scales during the emergence of CoO assemblies
| Autor: | Matthias Rebber, Dorota Koziej, Patrick Reisbeck, O. Ivashko, Blanka Detlefs, Lukas Grote, Cecilia A. Zito, Ann-Christin Dippel, Krzysztof Pitala, Kilian Frank, Kristina O. Kvashnina, Stephen Bauters, Bert Nickel, Sani Y. Harouna-Mayer, Pallavi Pandit |
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| Přispěvatelé: | Center for Hybrid Nanostructures, Deutsches Elektronen-Synchrotron DESY, Universidade Estadual Paulista (UNESP), Faculty of Physics and Center for NanoScience (CeNS), Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, The Rossendorf Beamline at the European Synchrotron Radiation Facility ESRF, Institute of Resource Ecology, European Synchrotron Radiation Facility ESRF, The Hamburg Centre for Ultrafast Imaging |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Absorption spectroscopy Science NANOPARTICLE Nucleation General Physics and Astronomy Nanoparticle HERFD-XANES 02 engineering and technology 010402 general chemistry Characterization and analytical techniques 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Nanomaterials Molecule CRYSTALLISATION Multidisciplinary Structural properties Scattering TOTAL SCATTERING COBALT OXIDE SAXS General Chemistry NON-CLASSICAL CRYSTALLIZATION NANOASSEMBLIES 021001 nanoscience & nanotechnology XANES 0104 chemical sciences Distribution function Nanocrystal Chemical physics ddc:500 0210 nano-technology |
| Zdroj: | Nature Communications 12(1), 4429 (2021). doi:10.1038/s41467-021-24557-z Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Nature Communications 'Nature Communications ', vol: 12, pages: 4429-1-4429-12 (2021) Nature Communications, Vol 12, Iss 1, Pp 1-12 (2021) |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-021-24557-z |
| Popis: | Nature Communications 12(1), 4429 (2021). doi:10.1038/s41467-021-24557-z The key to fabricating complex, hierarchical materials is the control of chemical reactions at various length scales. To this end, the classical model of nucleation and growth fails to provide sufficient information. Here, we illustrate how modern X-ray spectroscopic and scattering in situ studies bridge the molecular- and macro- length scales for assemblies of polyhedrally shaped CoO nanocrystals. Utilizing high energy-resolution fluorescence-detected X-ray absorption spectroscopy, we directly access the molecular level of the nanomaterial synthesis. We reveal that initially Co(acac)$_3$ rapidly reduces to square-planar Co(acac)$_2$ and coordinates to two solvent molecules. Combining atomic pair distribution functions and small-angle X-ray scattering we observe that, unlike a classical nucleation and growth mechanism, nuclei as small as 2 nm assemble into superstructures of 20 nm. The individual nanoparticles and assemblies continue growing at a similar pace. The final spherical assemblies are smaller than 100 nm, while the nanoparticles reach a size of 6 nm and adopt various polyhedral, edgy shapes. Our work thus provides a comprehensive perspective on the emergence of nano-assemblies in solution. Published by Nature Publishing Group UK, [London] |
| Databáze: | OpenAIRE |
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