Abstract
The simple structure of flexible piezoelectric polymers implies promise innumerous applications, such as transparent loudspeakers. In this study, we fabricated and characterized a prototype loudspeaker device. The loudspeaker was fabricated using a straightforward method of sandwiching a film of copolymer blend between a pair of flexible ITO substrates, which served as top and bottom electrodes. The dependence of acoustic properties of the devices was investigated in accordance with d33 and piezoresponse force microscopy (PFM). In this study, we examine the sound pressure level (SPL) and sound intensity (SI) of devices featuring 0.5 ≤ α ≤ 0.9 blends, with an active area of 6.5 cm × 5 cm at 100 Vpp applied voltage. Here we report SPL of 96 dB and SI of 3.98 m Wm−2 for an α = 0.7 blend at 100 Vpp. Our results are helpful in developing flexible, transparent piezoelectric polymers and in the development of lightweight, transparent loudspeaker devices.
Highlights
Since the discovery of piezoelectric properties in PVDF-based polymers, scientists and designers have been exploring pathways to incorporate transparent piezoelectric devices in the fastgrowing smart-device culture of the modern age[1]
The transparent piezoelectric loudspeaker films were prepared by sandwiching transparent piezoelectric polymer blends between flexible PET substrates with ITO electrodes
A direct correlation between Sound pressure level (SPL) and the beta phase was confirmed by Fourier transform infrared spectroscopy (FTIR)
Summary
Since the discovery of piezoelectric properties in PVDF-based polymers, scientists and designers have been exploring pathways to incorporate transparent piezoelectric devices in the fastgrowing smart-device culture of the modern age[1]. Recent research has shown that ferroelectric blends enable tuning of the structural properties of these materials, with good results in increasing the beta phase percentage[27].
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