Figure 11.

Optical images of a DIW fabricated piezoelectric woodpile stuctures — a) top of 2 samples with different samples and magnified view of (b) 10 mm x 10 mm sample with 400 µm filament diameter and (c) 12 mm x 12 mm sample with 250 µm filament diameter. Reproduced with permission.168 Copyright 2015, the authors. Published under CC‐BY 4.0 license. d) Optical images which illustrate the mechanism of electricity generation by DIW fabricated PNG device in its original, bended and released state and (e) simulation results of voltage output of spin‐coated PNG and DIW fabricated PNGs with different number of layers. Reproduced with permission.169