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. 2022 Sep 6;13:5249. doi: 10.1038/s41467-022-32975-w

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© The Author(s) 2022

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — SERS enhancement factors of pc-AuAg NSs with various plasmon resonance wavelengths were measured at varied concentrations (unit: μg/mL). The concentration for each measurement of SERS enhancement factor is shown on top of each column for each type of pc-AuAg NSs, and IR-1061 dye was used as the Raman molecule at a fixed concentration of 1.0 μM in all these measurements. Data are presented as mean values ± SD (n = 37 independent experiments).