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. 2019 Oct 23;11:92. doi: 10.1007/s40820-019-0323-8

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 5 — Several applications of CNT-based strain sensor. a Resistance response of finger motion. b Resistance response of wrist motion. c Monitoring the movement of a robot knee. d The pulse signal of a volunteer. e Detection of human breath through a mask. f Resistance response of tiny change of air pressure. g Monitoring the human voice with the word “Carbon”.h Monitoring the human voice with the word “Nanotube”. i Monitoring the human voice with the word “Graphene”