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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 (https://creativecommons.org/licenses/by/4.0/).
Analysis by ImageJ software: adjust the image format (A), separate nanoparticles from the background (B,C), and analyze and obtain the square values of each nanoparticle (D–F).