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. 2019 Jul 30;14:258. doi: 10.1186/s11671-019-3083-y

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© The Author(s). 2019

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 — Stability of gold nanoparticle nanocomposites by UV-Vis absorption spectra obtained 150 days after synthesis: chemically synthesized CO-AuNPs (a) and Acyl-CO-AuNPs (b) and green/one-pot synthesis for COS@2-AuNPs (c)