Abstract
This paper reports an improvement in dielectric and piezoelectric properties of screen-printed PZT/polymer films for flexible electronics applications using Cold Isostatic Pressing (CIP). The investigation involved half and fully cured PZT/polymer composite pastes with weight ratio of 12:1 to investigate the effect of the CIP process on the piezoelectric and dielectric properties. It was observed that the highest dielectric and piezoelectric properties are achieved at pressures of 5 and 10 MPa for half and fully cured films respectively. The relative dielectric constants were 300 and 245 measured at 1 kHz for the half and fully cured samples. Using unoptimised poling conditions, the initial d33 values were 30 and 35 pC/N for the half and fully cured films, respectively. The fully cured sample was then poled using optimized conditions and demonstrated a d33 of approximately 44 pC/N which is an increase of 7% compared with non-CIP processed materials.
Highlights
Many researchers exploit the piezoelectric effect in energy harvesting, sensing and actuating applications
Using piezoelectric composites instead of piezoelectric polymers gives the advantage of producing a material with a higher piezoelectric coefficient d33 and dielectric constant ɛr values [4, 5], improved electromechanical coupling coefficient [6] and greater opportunity for use in mass production because of the lower price of its ingredients compared to PVDF and its copolymers counterparts
This paper presents an evaluation of the effect of Cold Isostatic Pressing (CIP) on screen-printed composite PZT/polymer films by measuring the effect it has on the mechanical, dielectric and piezoelectric properties of the printed material
Summary
Many researchers exploit the piezoelectric effect in energy harvesting, sensing and actuating applications. Piezoelectric materials can be used in energy harvesting and sensing by applying a mechanical force (e.g. squashing or compression) to the material which produces a charge and voltage across the material (i.e. the direct effect). Ceramic piezoelectric materials (e.g. lead zirconate titanate PZT, Barium titanate BeTiO3) are brittle but offer high d33 (350-560 pC/N) and high dielectric constants (2900) Piezoelectric polymers such as PVDF provide relatively low d33 (20-30 pC/N) [1], low dielectric constants (~ 8 at 1kHz) [2] but they have good mechanical flexibility. This paper presents an evaluation of the effect of CIP on screen-printed composite PZT/polymer films by measuring the effect it has on the mechanical, dielectric and piezoelectric properties of the printed material
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