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. 2019 Mar 6;9:3629. doi: 10.1038/s41598-019-40248-8

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© The Author(s) 2019

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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DEP-assisted cold welding of AuNPs on mica substrate. HR-TEM images: The dark spots indicate AuNPs and the blurred stains show a cloud of assembled nanoribbons around the AuNPs. AFM amplitude error images: The nanoribbons started to grow between the aggregated AuNPs (d), around the aggregated AuNP (f) on mica substrate. The growth continues using the AuNPs around the tip of nanoribbon until no more AuNPs are available (e). AFM phase image: Very thin nanoribbons around a big cluster of AuNPs were barely recognizable in amplitude error image (f) but found in phase image (i).