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. 2021 Jan 18;11(1):238. doi: 10.3390/nano11010238

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© 2021 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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HRTEM images after 10 cycles indicating ZnO nanoparticle aggregates: (A) Large-scale image showing an aggregate consisting of small ZnO crystallites. (B) Small-scale image of nanocrystallites highlighting a crystallite with d-spacing of 2.81 angstrom fitting the (1,0,0) plane of ZnO (bottom right inset), and a SAED pattern of nanocrystalline aggregates (upper right inset).