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. 2022 Jul 19;7:16. doi: 10.1186/s41181-022-00170-3

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© The Author(s) 2022

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. 3 — Characterization of DyAu@AuNPs. a–d Representative TEM image of samples with different Dy:Au feeding ratios: Dy:Au = 1:3 (a), 1:5 (b), 1:10 (c), no Dy addition (d). Scale bar is 20 nm. See supporting information for size distribution histograms (Additional file 1: Fig. S1). e Hydrodynamic radius (R_H) of the samples measured by DLS. f) UV–vis spectrum of the DyAu@AuNPs