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. 2017 Jul 24;7:6347. doi: 10.1038/s41598-017-06639-5

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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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(A) Reaction scheme showing the morphological and structural changes involved in the fabrication of Au@Pt NPs with different Pt ratios. SEM images of Au@Pt NPs with different Pt source amount-modulated spiny Au NPs. The scale bar at the lower right corner indicates 200 nm. (B) Au₉₉@Pt₁ NPs (C) Au₉₅@Pt₅ NPs (D) Au₉₀@Pt₁₀ NPs (E) Au₈₅@Pt₁₅ NPs.