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. 2021 Jul 14;12:4297. doi: 10.1038/s41467-021-24568-w

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© The Author(s) 2021

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. 2 — a Schematic illustrations of photothermal and magneto-thermal induced self-healing mechanisms. b–d NIR laser-induced self-healing property: b Optical images show high stretchability of the healed hydrogel piece. c Tensile stress–strain curves of original and healed hydrogels. The inserted images show time-dependent temperature changes of hydrogel. d Strains of original and healed hydrogels with different contents of Fe₃O₄@Au composites. Error bars show the SD with sample size of 3. e–g Magnetically induced self-healing property: e Time-dependent temperature changes of the cylindrical hydrogels with different contents of Fe₃O₄@Au composites under alternating magnetic field. f Infrared thermal images of the cylindrical hydrogel. g Optical images show stretchability of the healed hydrogel. The inserted optical images show the glued structure of the fractured interface.