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(a) Schematic of an i-TENG made from PDMS and Al friction films (b) photograph of the i-TENG. ((c) and (d)) SEM images of micro-patterned PDMS films (c) and nano-structured Al foil (d) in the device. ((e) and (f)) Short-circuit current (e) and open-circuit voltage (f) of the i-TENG when it was implanted under the left chest skin of a rat. Reprinted with permission from Zheng et al., Adv. Mater. 26(33), 5851 (2014). Copyright 2014 Wiley-VCH.
