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. 2022 Feb 15;14:61. doi: 10.1007/s40820-022-00806-8

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Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 9 — a The monitoring of the blinking by attaching a strain sensor to the corner of one eye [90]. Copyright © 2016 Wiley–VCH. b Detection of the signals generated by cheek bulking [141]. Copyright © 2017 Wiley–VCH. c Real-time recording and recognition of speaking different words [193]. Copyright © 2019 Wiley–VCH. d Detection of neck movements through a multidirectional strain sensor [195]. Copyright © 2019 Wiley–VCH. e Monitoring the motion of wrist bending by attaching the miniaturized strain sensor to the wrist [199]. Copyright © 2020 American Chemical Society. f The detections of walking, running, and jumping by mounting a strain sensor on the knee surface [201]. Copyright © 2018 American Chemical Society