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(a) Schematic image of PI-packaged PVDF piezoelectric NG. (b) Photograph of the flexible NG device. (c) A flexible NG wraps around the ascending aorta of a porcine. (d) Blood pressure of the porcine (top) and corresponding output voltage of the NG (bottom) as a function of time. (e) A plot of NG output voltage as a function of blood pressure showing a good linearity. Reprinted with permission from Cheng et al., Nano Energy 22, 453 (2016). Copyright 2016 Elsevier.
