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. 2020 Jul 15;11:3537. doi: 10.1038/s41467-020-17345-8

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© The Author(s) 2020

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. 1 — a Comparison of Young’s modulus and relative triboelectric polarity of electrical insulating polymers that are compatible with the thermal drawing process. PTFE is also listed for a better comparison. b Rheological properties of Geniomer: storage modulus (G’), loss modulus (G”), and complex viscosity. c Schematic showing thermal drawing process for the production of long fibers. d A roll of 40 m of continuous fiber obtained from a single draw, demonstrating the scalability of drawing process. e Stress–strain curves of a fiber without and with an embedded liquid metal electrode. The inset shows a fiber being randomly knotted. f SEM image of a fiber with a single liquid metal electrode. Scale bar: 200 μm. g, h SEM image of a fiber with microtextured surface. Scale bar: 200 μm (g) and 20 μm (h). i SEM image showing a fiber with four liquid metal electrodes. Scale bar: 200 μm. Note the abbreviations of the polymers in a: PC polycarbonate, PMMA poly(methyl methacrylate), PSu polysulfone, PEI polyetherimide, PS polystyrene, SEBS poly(styrene-b-(ethylene-co-butylene)-b-styrene), PTFE polytetrafluoroethene.