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Electrochemical contribution to local electromechanical response in P(VDF-Tr Fe)/LiNbO3

Authors: M.V. Silibin; M.S. Ivanov; V.A.Khomchenko; T. Nikitin; A.S. Kalinin; D.V.Karpinsky; V.V. Polyakov; R. Fausto; J.A.Paixão

Ref.: 2nd International Conference on Nanomaterials Science and Mechanical Engineering, ICNMSME-2019 (2019)

Abstract: In this work, we demonstrate an alteration of mechanical, electrophysical, piezo-and ferroelectric properties of P(VDF-TrFE) polymer at the composition of 70/30 mol% in the presence of lithium niobate (LiNbO3) nanofillers. The micro-and nanoscale measurements of the elastic modulus suggest a two-fold increase in the mechanical rigidity of P(VDF-TrFE) film after embedding the LiNbO3nanofillers. The enhancement of local piezo-and ferroelectric properties of the modified polymer is evidenced by the increase of the direct piezoelectric coefficient from 27.1 pm/V to 36.1 pm/V. This increase has been associated with the significant contribution of the Li-ion stimulus diffusion –the ionic phenomena due to the LiNbO3nanofillers [1], as unambiguously affirmed by electrochemical strain (ES) response, ES time spectroscopy, and Kelvin probe force microscopy methods.The results obtained demonstrate crucial achievements towards the polymer nanofillers strategy, LiNbO3in particular, in attaining the desired functional behavior paving a way towardsthe development of adavanced sensors, transducers, actuators and piezoelectric devices.