Spin-cast P(VDF-TrFE) films for high performance medical ultrasound transducers

Evaluation of the acoustical properties of adhesive-free dual layer piezoelectric PVDF copolymer transducer

“…This behavior is most likely due to the differences in resonance frequency of the single and dual layer systems, suggesting a dual layer response frequency at around 50% of the single layer value. The estimated resonance frequencies of P(VDF-TrFE) films with thicknesses 20 and 40 are 15 and 30 MHz, respectively (assumng a 4 ⁄ resonance due to rigidity of the material PEI compare to air and epoxy backing [2,3]). The speed of sound in P(VDFTrFE) was taken as 2400 m/s in the estimate [2].…”

PVDF copolymer transducers used to evaluate microparticle suspensions

“…Poly(vinylidene fluoride) (PVDF) and its co-polymer poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] have extensively been used as piezoelectric materials for sensors, transducers, and actuators [1][2][3][4][5][6][7][8][9].…”

“…Moreover, they also yield broad banded frequency responses which are essential for various ultrasonic analyses [1][2][3][4][5]. These copolymers can be processed by various techniques such as spin coating, hot pressing, stamping, spraying etc., on both rigid and flexible substrates [1][2][3][4][5][6][7][8][9]. Recently, it was also shown that P(VDFTrFE) could be screen-printed from the fluid phase, together with electrodes of conductive polymers to utilize high frequency ultrasonic transducers with polyetherimide (Ultem) as the printing substrate [10,11].…”

Dual layer ultrasonic transducer used for touch sensing

“…P(VDF-TrFE)] exhibiting piezo, pyro and ferroelectrics properties have been investigated over a past decade for manufacturing ultrasonic sensors, transducers, actuators, etc. [1][2][3][4][5][6][7][8][9][10]. These polymers have advantages in terms of being flexible, workability, light weight and chemical stability [7][8][9]12].…”