Defect-mediated ripening of core-shell nanostructures

Qiubo Zhang; Xinxing Peng; Yifan Nie; Qi Zheng; Junyi Shangguan; Chao Zhu; Karen C Bustillo; Peter Ercius; Linwang Wang; David T Limmer; Haimei Zheng

doi:10.1038/s41467-022-29847-8

Defect-mediated ripening of core-shell nanostructures

Nat Commun. 2022 Apr 25;13(1):2211. doi: 10.1038/s41467-022-29847-8.

Authors

Qiubo Zhang^#¹, Xinxing Peng^#², Yifan Nie¹, Qi Zheng¹, Junyi Shangguan^{1

3}, Chao Zhu⁴, Karen C Bustillo², Peter Ercius², Linwang Wang¹, David T Limmer^{1

5

6

7}, Haimei Zheng^{8

9}

Affiliations

¹ Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
² National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
³ Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
⁴ School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
⁵ Department of Chemistry, University of California, Berkeley, CA, 94720, USA.
⁶ Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
⁷ Kavli Energy Nanoscience Institute, Berkeley, CA, 94720, USA.
⁸ Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA. hmzheng@lbl.gov.
⁹ Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA. hmzheng@lbl.gov.

^# Contributed equally.

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-CdCl₂ 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 CdCl₂ 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 CdCl₂ shell, accompanied by disordering and crystallization of the shell structure, mediate the ripening of Cd-CdCl₂ CSN in the solution.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Cadmium
Crystallization
Microscopy, Electron, Transmission
Nanoparticles* / chemistry
Nanostructures* / chemistry

Substances

Cadmium