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. 2017 Oct 13;8:927. doi: 10.1038/s41467-017-00970-1

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© The Author(s) 2017

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. 2 — Monitoring size growth by ultraviolet-visible absorption spectroscopy. Time−course ultraviolet-visible absorption spectra of a pre−growth, b size growth, and c size−focusing stages from [Au₂₅(SR)₁₈]⁻ to [Au₄₄(SR)₂₆]²⁻. The insets show digital photos of reaction mixture taken at varied reaction times. The black arrows in a are visual guides for the absorption features of [Au₂₅(SR)₁₈]⁻, while the blue arrows in b, c are visual guides for the absorption features of [Au₄₄(SR)₂₆]²⁻