Defect-mediated ripening of core-shell nanostructures.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35468902.
- Also identified by DOI 10.1038/s41467-022-29847-8 and PMC identifier 9038757.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Understanding nanostructure ripening mechanisms is desirable for gaining insight on the growth and potential applications of nanoscale materials. However, the atomic pathways of nanostructure ripening in solution have rarely been observed directly. Here, we report defect-mediated ripening of Cd-CdCl<sub>2</sub> core-shell nanoparticles (CSN) revealed by in-situ atomic resolution imaging with liquid cell transmission electron microscopy. We find that ripening is initiated by dissolution of the nanoparticle with an incomplete CdCl<sub>2</sub> shell, and that the areas of the Cd core that are exposed to the solution are etched first. The growth of the other nanoparticles is achieved by generating crack defects in the shell, followed by ion diffusion through the cracks. Subsequent healing of crack defects leads to a highly crystalline CSN. The formation and annihilation of crack defects in the CdCl<sub>2</sub> shell, accompanied by disordering and crystallization of the shell structure, mediate the ripening of Cd-CdCl<sub>2</sub> CSN in the solution.
Medical subject headings
- Nanoparticles
- Nanostructures