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Shedding Light on the Role of Misfit Strain in Controlling Core-Shell Nanocrystals

Journal

ADVANCED MATERIALS
Volume 32, Issue 46, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004142

Keywords

catalysis; core-shell nanocrystals; lattice mismatch; optical tuning; strain relaxation

Funding

  1. National Natural Science Foundation of China [21773200, 21573185]
  2. Research Grants Council of Hong Kong [CityU 11204717, 11205219]

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Heteroepitaxial modification of nanomaterials has become a powerful means to create novel functionalities for various applications. One of the most elementary factors in heteroepitaxial nanostructures is the misfit strain arising from mismatched lattices of the constituent parts. Misfit strain not only dictates epitaxy kinetics for diversifying nanocrystal morphologies but also provides rational control over materials properties. In recent years, advances in chemical synthesis along with the rapid development of electron microscopy and X-ray diffraction techniques have enabled a substantial understanding of strain-related processes, which offers theoretical foundation and experimental guidance for researchers to refine heteroepitaxial nanostructures and their properties. Herein, recent investigations on heterogeneous core-shell nanocrystals containing misfit strains are summarized, with a focus on the mechanistic understanding of strain and strain-induced effects such as tuning the epitaxial habit, modulating the optical emission, and enhancing the catalytic activity and magnetic coercivity.

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