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. 2019 Aug 1;14:263. doi: 10.1186/s11671-019-3084-x

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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. 3 — a Schematic of the mechanism of the sensor with hollow-sphere structure induced by sunflower pollen microcapsules under pressure. b Transient response of SFP-based composite film (CF) and planar CF under 600Pa pressure. c Relaxation time of the two related sensors. d Stability test of SFP-based CF at 80 Pa. Adapted with permission from ref. 3. Copyright 2017 Elsevier. e The SEM image of the converted carbon paper. f, g Monitoring the breath (f) and gesture (g) of an adult by the CP/PDMS sensor. Adapted with permission from ref. 63. Copyright 2017 American Chemical Society