Abstract
Pyroelectric Langmuir-Blodgett (LB) films of 1-docosylamine alternated with ω-tricosenoic acid, and an organo-ruthenium complex alternated with behenic acid have been studied for their piezoelectric effect. A purpose built rig was designed for applying an oscillating bending flexure to the composite structure (comprised of a glass substrate, metal electrode, and active film), producing tensile and compressive stresses in the film on its surface. The piezoelectric d 31 coefficient was determined from the stress state in the active layer, the resultant charge, and the elastic properties of the composite. The accuracy of this experimental method was verified by measuring the piezoelectric response of a thin (1.3 μm) spuncoat, polarized film of a 70:30 VF TrFE copolymer with known piezoelectric and elastic properties. Piezoelectric coefficients of 0.023 pC N −1 and 0.17 pC N −1 have been obtained from the acid/amine and the alternate layer ruthenium complex, respectively. The higher degree of piezoelectric activity in the ruthenium complex is believed to be due to the higher molecular mobility in this material.
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