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나노입자 연구단
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Design and synthesis of multigrain nanocrystals via geometric misfit strain

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Title
Design and synthesis of multigrain nanocrystals via geometric misfit strain
Author(s)
Myoung Hwan Oh; Min Gee Cho; Dong Young Chung; Inchul Park; Kwon Y.P.; Ophus C.; Dokyoon Kim; Kim M.G.; Jeong B.; Gu X.W.; Jinwoung Jo; Ji Mun Yoo; Jaeyoung Hong; McMains S.; Kisuk Kang; Yung-Eun Sung; Alivisatos A.P.; Taeghwan Hyeon
Publication Date
2020-01
Journal
NATURE, v.577, no.7790, pp.359 - 363
Publisher
NATURE PUBLISHING GROUP
Abstract
The impact of topological defects associated with grain boundaries (GB defects) on the electrical, optical, magnetic, mechanical and chemical properties of nanocrystalline materials1,2 is well known. However, elucidating this influence experimentally is difficult because grains typically exhibit a large range of sizes, shapes and random relative orientations3-5. Here we demonstrate that precise control of the heteroepitaxy of colloidal polyhedral nanocrystals enables ordered grain growth and can thereby produce material samples with uniform GB defects. We illustrate our approach with a multigrain nanocrystal comprising a Co3O4 nanocube core that carries a Mn3O4 shell on each facet. The individual shells are symmetry-related interconnected grains6, and the large geometric misfit between adjacent tetragonal Mn3O4 grains results in tilt boundaries at the sharp edges of the Co3O4 nanocube core that join via disclinations. We identify four design principles that govern the production of these highly ordered multigrain nanostructures. First, the shape of the substrate nanocrystal must guide the crystallographic orientation of the overgrowth phase7. Second, the size of the substrate must be smaller than the characteristic distance between the dislocations. Third, the incompatible symmetry between the overgrowth phase and the substrate increases the geometric misfit strain between the grains. Fourth, for GB formation under near-equilibrium conditions, the surface energy of the shell needs to be balanced by the increasing elastic energy through ligand passivation8-10. With these principles, we can produce a range of multigrain nanocrystals containing distinct GB defects. © The Author(s), under exclusive licence to Springer Nature Limited 2020
URI
https://pr.ibs.re.kr/handle/8788114/6955
ISSN
0028-0836
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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