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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. 3 — a Extinction spectra and photographs of aqueous suspensions of Ag@Au NCs synthesized with different volumes of 1 mM HAuCl₄. b Extinction spectra of the corresponding pc-AuAg NSs made with different volumes of 1 mM HAuCl₄ (left to right: 1.2, 1.0, 0.8, 0.6, 0.4, 0.3, 0.2, and 0.1 mL). The structural evolution of pc-AuAg NSs with the increasing pore number is schematically shown. c (i) Calculated extinction cross-section (σ_Ext) spectra and (ii) near-field (lg(|E|/|E₀|)) distribution at the plasmon resonance wavelength (λ) of pc-AuAg NSs with representative pore number (N) and diameter (d) denoted as (N, d, λ).