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. 2024 Mar 25;19(1):55. doi: 10.1186/s11671-024-04001-z

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© The Author(s) 2024

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 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. 4 — a Real-time current change of pressure sensor in response to finger bending with various bending angles from 10°to 90°. Inset: The photograph of finger motions. b The real-time current profiles of the device in response to finger bending with bending angle of 20°. c Corresponding signals for the process of expiration. d The relative current change of Morse code for “fibroin”. e Sensing performance of the device attached to the arm muscle for real-time detection of radial muscle contraction. Inset: Photograph of the device attached to the arm muscle in the process of hand open and grip. f Real-time current change of pressure sensors in response to the process of grinning