Fig. 1 Device structure, typical output performance, and cytocompatibility of BD-TENG. Device structure, typical output performance, and cytocompatibility of BD-TENG. (A and B) SEM and atomic force microscopy (AFM) images of the nanostructure on the BDP film (scale bar, 10 μm). (C and D) Schematic diagram and photograph of BD-TENG. (E and F) Measured electrical signals by applying an external force: (E) Voc and (F) Isc. (G) Cell viability after cells were cultured with different BDP films for 7 days. (Inset: Fluorescence images of stained endothelial cells that were cultured on BDP films. Scale bar, 100 μm.) Qiang Zheng et al. Sci Adv 2016;2:e1501478 Copyright © 2016, The Authors