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. 2017 Mar 21;9(4):42. doi: 10.1007/s40820-017-0139-3

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© The Author(s) 2017

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 — a Resistivity as a function of the repeated bending/relaxation cycles. b Resistive response of the sensor to the bending angle from 0° to 150°. c Resistive response of the sensor to the strain. d Response of the sensor to the pressure from 5 to 400 g. e SEM images of sandwich structure. The red lines describe the copper electrode area, and the blue arrows show where the electrode is covered by PDMS. f Typical SEM image of copper electrode after 6000 bending cycles. The blue circles show the damaged parts of copper electrode. (Color figure online)