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. 2018 Jul 17;9:2786. doi: 10.1038/s41467-018-05238-w

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© The Author(s) 2018

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. 3 — Mechanical and electromechanical performances. a Photographs demonstrating good electrical conductivity of AATN hydrogel when stretched, twisted and bended. b Tensile stress–strain curves of PNIPAM hydrogel (black line), AgNW/PNIPAM hydrogel (red line), and AATN hydrogel (blue line). The inset showing AATN hydrogel when stretched. c Variation of electrical resistance (ΔR) of AATN hydrogel during 10 stretching-releasing cycles with the fixed strains of 100, 300, 500, and 700%, respectively. d ΔR values of AATN hydrogel during 1st, 10th, 100th, and 500th cycle with a continuous stretching up to a strain of 800%. e ΔR values of AATN hydrogel during the bending-releasing cycles with a small bending radius of 1 mm. The inset showing the hydrogel during bending process and ΔR values during 1000 cycles. f Ashby chart plotting normalized resistance change (ΔR/R₀) vs. tensile strain of AATN hydrogel and the reported stretchable conductors. The inset showing enlarged view of the rectangular area. Numbers stand for relevant references. (Hollow diamond: CNT-based stretchable conductor; solid diamond: graphene-based conductor; semi-hollow diamond: metal nanowire-based conductor; and solid sphere: AATN hydrogel). g Ashby chart plotting ΔR/R₀ vs. tensile strain of AATN hydrogel and the reported stretchable conductors with 100 stretching cycles. The insert showing enlarged view of the rectangular area. Numbers stand for relevant references. (Hollow diamond: CNT-based conductor; semi-hollow diamond: metal nanowire-based conductor; solid diamond: other conductor; and solid sphere: AATN hydrogel)