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(a) Schematic illustration of i-TENG made from PTFE and Al friction layers. (b) SEM image of nano-structured PTFE films (scale bar: 5 μm). (c) Short-circuit current and open-circuit voltage of the i-TENG implanted between the heart and pericardium of a porcine. Reprinted with permission from Zheng et al., ACS Nano 10(7), 6510 (2016). Copyright 2016 the American Chemical Society.
