Piezoelectric effect of plant leaf

Abstract

The observation of bending piezoelectric effect and the measurement of the dielectric constant were performed for leaves of lily and bamboo before withering. The bending piezoelectric constants β = 70 × 10⁻⁹ C/m for lily and β = 12 × 10⁻⁹ C/m for bamboo were obtained, which were in the same level as that for a poled PVDF. The value of the dielectric constant was as high as 500–2000 in the frequency range from 10 Hz to 1 MHz. When the sample was mechanically clamped, the dielectric constant decreased almost to half, suggesting the converse piezoelectric effect.

Key Words:

• Piezoelectric effect
• plant leaf
• bending piezoelectric constant
• dielectric constant.