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. 2020 Feb 17;7:5. doi: 10.1186/s40580-019-0216-z

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Size and shape confirmation of each Au nanoparticle. a TEM images of AuNP, AuNC and AuNC@SiO₂. The size of scale bars is 50 nm. b Particle size distribution histograms of AuNP, AuNC, and AuNC@SiO₂, from the upper to lower right. Each DLS data point is an average of 15 scans