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. 2021 Sep 27;11(10):2525. doi: 10.3390/nano11102525

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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 (https://creativecommons.org/licenses/by/4.0/).

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Illustrations of various microscopic images for the characterization of CDs. (A) 2D topographical AFM image. Reproduced from [156], with permission from Elsevier, 2014. (B) 3D topographical AFM image. Reproduced from [156], with permission from Elsevier, 2014. (C) The height profiles of lines I, II, and III that are mentioned in (A). Reproduced from [156], with permission from Elsevier, 2014. (D) SEM image. Reproduced from [157], with permission from Elsevier, 2014. (E) TEM image [158]. (F) HRTEM image [158].