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. 2022 Aug 22;14(16):3433. doi: 10.3390/polym14163433

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© 2022 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/).

PMC Copyright notice

(A) SEM micrographs of Ti₃AlC₂ before and (B) after etching. (C) TEM images of Ti₃C₂ after etching [1] © American Chemical Society (2012). (D,E) TEM images (bright and dark field Nb₂C). (F) High-resolution HAADF-STEM image. Adapted from Reference [12] © American Chemical Society (2019).