Air-Borne Ultrasonic Transducers Based on Cross-Linked Polypropylene Ferro/Piezoelectrets

Xue, Yanfeng; Li, Shuang; Zhang, Mi; Ruan, Zehai; Wu, Kai; Cao, Jianglang; Li, Guanglin; Zhang, Xiaoqing; Fang, Peng

doi:10.1109/jsen.2022.3186915

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…Nowadays, studies are being conducted to develop new acoustic devices with an aim to improve mechanical flexibility and ecological friendliness and enrich the functionalities of the devices by several research groups. ,,,− The most representative ones are the acoustic sensors based on triboelectric , and piezoelectric effects. , Triboelectric sensors rely on the coupling of triboelectrification and electrostatic principles to achieve electromechanical energy conversion and have been demonstrated to be a promising technique in acoustic sensing applications. However, the performance of triboelectric acoustic sensors depends heavily on device architecture, and the output attributes are susceptible to the mechanical stimulus forms, resulting in inferior controllability of device stability.…”

Section: Introductionmentioning

confidence: 99%

Biodegradable, Bifunctional Electro-acoustic Transducers Based on Cellular Polylactic Acid Ferroelectrets for Sustainable Flexible Electronics

Hu,

Zhou,

et al. 2024

ACS Appl. Mater. Interfaces

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Nowadays, humans rely increasingly on smart electronics to address grand challenges and to improve life conditions in the era of digitalization and big data. However, electronics often have a limited lifespan, and they may bring electronic waste problems after their service. To mitigate this problem, environmentally sustainable methods of electronic device production and disposal are highly recommended, where advanced functional materials should be redesigned with improved sensing performance over the entire operational life while also being naturally degradable at the end. Herein, a biodegradable and flexible bifunctional electroacoustic transducer was fabricated with the utilization of cellular polylactic acid (PLA) ferroelectret films, possessing a small acoustic impedance of ∼0.02 MRayl which is quite close to that of air and a high figure of merit (FOM: d 33 •g 33 ) of ∼11 GPa −1 . Such devices have a prominent signal-to-noise ratio (SNR) of ∼23.5 dB @1 kHz and can work either as a microphone by direct piezoelectric effect or a loudspeaker by reverse piezoelectric effect in air medium. When used as a microphone, the flexible device exhibits a prominent receiving sensitivity up to 4.2 mV/Pa (∼−47.5 dB/ref. 1 V/Pa) at 1 kHz. When served as a loudspeaker, it is capable of yielding high sound pressure levels (SPLs) ranging from 60 to 103 dB (ref. 20 μPa) in a broad frequency range of 1−80 kHz with an active area of 3.14 cm 2 . Additionally, the electrical response curve of the device is very flat in a wide frequency range from 300 to 3000 Hz. With the high-performance acoustic-electric conversion capacity, the PLA ferroelectret-based flexible and filmlike electroacoustic transducer was used to realize accurate speech recognition and control, providing a strong impetus for its advanced and eco-friendly applications in the era of the internet of things (IoT) and artificial intelligence.

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Section: Introductionmentioning

confidence: 99%

Biodegradable, Bifunctional Electro-acoustic Transducers Based on Cellular Polylactic Acid Ferroelectrets for Sustainable Flexible Electronics

Hu,

Zhou,

et al. 2024

ACS Appl. Mater. Interfaces

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Ferroelectret nanogenerators for the development of bioengineering systems

Li¹,

Cao²,

Wang³

et al. 2023

Cell Reports Physical Science

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Ferroelectrets: Heterogenous polymer electrets with high piezoelectric sensitivity for transducers

et al. 2023

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Nowadays, the demand for advanced functional materials in transducer technology is growing rapidly. Piezoelectric materials transform mechanical variables (displacement or force) into electrical signals (charge or voltage) and vice versa. They are interesting from both fundamental and application points of view. Ferrooelectrets (also called piezoelectrets) are a relatively young group of piezo-, pyro- and ferroelectric materials. They exhibit ferroic behavior phenomenologically undistinguishable from that of traditional ferroelectrics, although the materials per se are essentially non-polar space-charge electrets with artificial macroscopic dipoles (i.e., internally charged cavities). A lot of work has been done on ferroelectrets and their applications up to now. In this paper, we review and discuss mostly the work done at University of Potsdam on the research and development of ferroelectrets. We will, however, also mention important results from other teams, and prospect the challenges and future progress trend of the field of ferroelectret research.

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Air-Borne Ultrasonic Transducers Based on Cross-Linked Polypropylene Ferro/Piezoelectrets

Cited by 3 publications

References 35 publications

Biodegradable, Bifunctional Electro-acoustic Transducers Based on Cellular Polylactic Acid Ferroelectrets for Sustainable Flexible Electronics

Biodegradable, Bifunctional Electro-acoustic Transducers Based on Cellular Polylactic Acid Ferroelectrets for Sustainable Flexible Electronics

Ferroelectret nanogenerators for the development of bioengineering systems

Ferroelectrets: Heterogenous polymer electrets with high piezoelectric sensitivity for transducers

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