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. 2020 Aug 10;6:59. doi: 10.1038/s41378-020-0154-2

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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. 2 — a Working mechanism of the ISTSA based on one sensor unit. b The output voltage of one sensor unit in response to various contact materials (contact area of 1 cm²) under the same mechanical stimuli. c The output voltage of one sensor unit using Al as the contact material (area of 1 cm²) as a function of input pressure. d and e Distribution of output voltage when finger touches one sensor unit as indicated the unit position in red (insets in d and e). The data acquisition instrument has an internal resistance of 1 MΩ