Fig. 2
From: Ultra-Sensitive Strain Sensor Based on Flexible Poly(vinylidene fluoride) Piezoelectric Film

a Surface morphology of the proposed sensor after etching technology. b Surface morphology and c phase PFM images of PVDF film of the sensor
From: Ultra-Sensitive Strain Sensor Based on Flexible Poly(vinylidene fluoride) Piezoelectric Film
a Surface morphology of the proposed sensor after etching technology. b Surface morphology and c phase PFM images of PVDF film of the sensor