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. 2020 Feb 15;11(2):200. doi: 10.3390/mi11020200

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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Photos of force sensors, temperature sensors and blood glucose sensors. (A) The resistance of a printed pressure sensor according to external pressure, reproduced with permission from [110]. (B) A micro-channel pressure sensor: (a) Structure of the sensor; (b) Working principle of measuring viscosity of various fluids; Reproduced with permission from [95]. (C) Schematic of artificial hair cell sensor: (a) No external force; (b) Deformation under a shear force; (c) Deformation under a normal force. (D) Thermocouple based on liquid metal printed on paper, reproduced with permission from [109].