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. 2020 Aug 22;20(17):4754. doi: 10.3390/s20174754

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Low resolution TEM image of Zn₁Ni₂ hierarchical structures. (b,c) High resolution TEM images of Zn₁Ni₂ hierarchical structures. (d) Selected area electron diffraction (SAED) patterns of Zn₁Ni₂ hierarchical structures.