When the three-layer structure comprised of a
top thin plastic substrate, a layer of six BaTiO 3 NPs-embedded
PDMS, and a bottom thick plastic substrate is bent, the tensile
stress is built-up over the entire PDMS matrix due to the shift of the neutral plane to bottom side. Figure 3 b shows the colorcoded
piezopotential distribution of the PDMS between the top
and bottom electrodes. The calculated piezopotential for tensile
strain of 0.33% in the X-axis is generated across the top and
bottom sides of the PDMS matrix by the piezoelectric NPs.