This talk focuses on recent progress in representative applications of ferroelectric and relaxor ferroelectric polymers in flexible electronics. First, a brief introduction will be given on Poly(vinylidene fluoride) (PVDF) based polymers whose are among electroactive polymers that attract a substantial amount of attention for modern flexible electronics. Then, fabrication technologies of PDVF-based polymer thin film as well as several applications of the ferroelectric copolymer P(VDF-TrFE) including piezoelectric sensors will be highlighted. Finally, research aspects involving the use of relaxor ferroelectric P(DVF-TrFE-CTFE) for high k gate dielectric material and actuators will be presented.
At the microscale, cantilever vibrations depend not only on the microstructure’s properties and geometry but also on the
properties of the surrounding medium. In fact, when a microcantilever vibrates in a fluid, the fluid offers resistance to the
motion of the beam. The study of the influence of the hydrodynamic force on the microcantilever’s vibrational spectrum
can be used to either (1) optimize the use of microcantilevers for chemical detection in liquid media or (2) extract the
mechanical properties of the fluid. The classical method for application (1) in gas is to operate the microcantilever in the
dynamic transverse bending mode for chemical detection. However, the performance of microcantilevers excited in this
standard out-of-plane dynamic mode drastically decreases in viscous liquid media. When immersed in liquids, in order to
limit the decrease of both the resonant frequency and the quality factor, alternative vibration modes that primarily shear
the fluid (rather than involving motion normal to the fluid/beam interface) have been studied and tested: these include in-plane
vibration modes (lateral bending mode and elongation mode). For application (2), the classical method to measure
the rheological properties of fluids is to use a rheometer. To overcome the limitations of this classical method, an
alternative method based on the use of silicon microcantilevers is presented. The method, which is based on the use of
analytical equations for the hydrodynamic force, permits the measurement of the complex shear modulus of viscoelastic
fluids over a wide frequency range.
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