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. 2018 Apr 23;13:116. doi: 10.1186/s11671-018-2533-2

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — TEM images of agglomerated GO flakes (a), GO flakes after ultrasonic treatment (b), agglomerated Ag-NPs (c), Ag-NPs after ultrasonic treatment (d), and GO-Ag (e, f). The decrease of the average GO particle size after ultrasonic treatment was caused by defragmentation or folding of the GO flakes. The decrease of the average Ag size after ultrasonic treatment was caused by defragmentation of Ag agglomerates. Note: Arrows point to Ag-NPs/agglomerates