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. 2022 Jul 6;22(14):5089. doi: 10.3390/s22145089

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Flexible sensors based on different sensing mechanisms, detected objects, and contact forms: (a) a resistive strain sensor attached to the skin [31]; (b) a wearable triboelectric sensor for a dynamic prosthetic fit [32]; (c) a highly stretchable, tough, and sensitive strain sensor [33]; (d) organic chemical sensors for the detection of chemically corrosive vapors [34]; (e) contact sensors for bio-detection of flexographically printed fabrics made of fluorine-containing G-type nerve agents [35]; and (f) a non-contact sensor for a physiological monitoring system based on the wearer’s palm [36].