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. 2019 Dec 30;5:64. doi: 10.1038/s41378-019-0116-8

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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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Fig. 6 — a Optical microscope image of an array of 40 μm diameter circles with 80 μm pitch. b Surface topography of an array of 40 μm diameter circles with 80 μm pitch. The RMS height of these circles is around 617 nm with a standard deviation of 119 nm. c An optical microscope image showing the full areal scale (2.3 mm × 1.2 mm) array sintered on a 1 μm thick Ag NP ink layer. (inset) Enlarged image of an array of 20 μm diameter circles with 40 μm pitch. d Optical microscope image of longhorn logo (trademark of The University of Texas at Austin). The smallest feature size in this sintered part is around 7 μm near the tip of the longhorn ears.