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. 2018 Aug 17;13:241. doi: 10.1186/s11671-018-2648-5

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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 — I_D/I_G values of the GNPs produced using various sonication powers and times from (a1) G10, (b1) G30, and (c1) G100. I_D/I_G values of the GNPs produced by exfoliating (a2) G10, (b2) G30, and (c2) G100 as a function of sonication energy input