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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/).
(a) TEM micrograph of sample ZC2. Dotted lines indicate two ZnO NPs with different orientations; (b,d) STEM micrographs of a ZnO NPs exposing an in-plane (b) and out-of-plane (d) view of 0001 planes; (c,e) High-resolution STEM micrographs relative to (b) and (d) respectively.