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. 2020 Nov 12;11:5747. doi: 10.1038/s41467-020-19531-0

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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. 6 — a Photographs showing both proximity sensing and pressure sensing of AiFoam sensor. Left The blue LED is activated, indicating the electrical circuit is turned on. Middle The orange LED lighted up when the human finger approaches to the sensor. Right The blue LED becomes brighter when the finger touches and presses the sensor. b The capacitance change responses on the distance between the finger and the AiFoam sensor (with 25 vol% μNi). The error bars are calculated based on three tests. C₀ represents the initial capacitance of the sensor and C represents the capacitance of the sensor during the proximity test. d represents the distance between the human finger and AiFoam. c The resistance change responses on external pressure of AiFoam sensor (with 25 vol% μNi). R₀ represents the initial resistance of the sensor and R represents the resistance of the sensor during the pressure test.