Abstract
Abstract Flexible piezoelectric composites offer alternative and/or additional solutions to sensor, actuator and transducer applications. Here high density, highly flexible piezoelectric composites with 0–3 connectivity using filler volume fractions up to 50 vol.% are realized by solution casting of dispersions of ferroelectric (Pb(Zr x Ti 1− x )O 3 (PZT) in poly-dimethylsiloxane (PDMS). Excellent piezoelectric properties (permittivity ɛ r up to ∼40, piezoelectric charge constant d 33 up to 25 pC/N, piezoelectric voltage coefficient g 33 up to 75 mV m/N), electrical properties (conductivity σ about 1 × 10 −6 S/m at 1000 Hz) and mechanical properties (storage modulus E ′ up to 10 MPa, loss modulus E ″ less than 0.5 MPa, limited creep and stress relaxation) have been realized. The high flexibility combined with excellent properties of these composites opens new ways to ‘soft touch’ applications in a variety of transducer and sensor applications.
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