Flexible film-transducers based on polypropylene piezoelectrets: Fabrication, properties, and applications in wearable devices

Ma, Xikui; Zhang, Xiaoqing; Peng, Fang

doi:10.1016/j.sna.2017.01.014

Cited by 26 publications

(19 citation statements)

References 46 publications

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“…The bias can be provided either by pre-charged electrets or by an external power source. Piezoelectric harvesters usually operate on stretching or compressing piezoelectric materials, such as piezoelectric polymers and piezoelectric ceramics, thus transforming mechanical strain or stress into electricity due to the piezoelectric effect [31][32][33][34][35]. Among these mechanisms, the triboelectric nanogenerator presents numerous advantages in terms of high output voltage and efficiency, ease of structural design and fabrication, diverse material selection, low-cost and broad low-frequency application scenarios such as human motion and aircraft morphing wing oscillation [25,26,[36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Honeycomb-Structured Electret/Triboelectric Nanogenerator for Biomechanical and Morphing Wing Energy Harvesting

Tao

Chen

et al. 2021

Nano-Micro Lett.

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Flexible, compact, lightweight and sustainable power sources are indispensable for modern wearable and personal electronics and small-unmanned aerial vehicles (UAVs). Hierarchical honeycomb has the unique merits of compact mesostructures, excellent energy absorption properties and considerable weight to strength ratios. Herein, a honeycomb-inspired triboelectric nanogenerator (h-TENG) is proposed for biomechanical and UAV morphing wing energy harvesting based on contact triboelectrification wavy surface of cellular honeycomb structure. The wavy surface comprises a multilayered thin film structure (combining polyethylene terephthalate, silver nanowires and fluorinated ethylene propylene) fabricated through high-temperature thermoplastic molding and wafer-level bonding process. With superior synchronization of large amounts of energy generation units with honeycomb cells, the manufactured h-TENG prototype produces the maximum instantaneous open-circuit voltage, short-circuit current and output power of 1207 V, 68.5 μA and 12.4 mW, respectively, corresponding to a remarkable peak power density of 0.275 mW cm−3 (or 2.48 mW g−1) under hand pressing excitations. Attributed to the excellent elastic property of self-rebounding honeycomb structure, the flexible and transparent h-TENG can be easily pressed, bent and integrated into shoes for real-time insole plantar pressure mapping. The lightweight and compact h-TENG is further installed into a morphing wing of small UAVs for efficiently converting the flapping energy of ailerons into electricity for the first time. This research demonstrates this new conceptualizing single h-TENG device's versatility and viability for broad-range real-world application scenarios.

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Section: Introductionmentioning

confidence: 99%

Hierarchical Honeycomb-Structured Electret/Triboelectric Nanogenerator for Biomechanical and Morphing Wing Energy Harvesting

Tao

Chen

et al. 2021

Nano-Micro Lett.

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“…Electret materials have been used in various fields, such as pressure sensors, barometers and acoustic transducers in microphones [1][2][3][4][5] , thanks to the quasipermanent electric charge feature in electrets. Recently, electrets have been explored for use in new applications in MEMS vibration energy harvesters that are based on electrostatic induction [6][7][8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Spray-coated electret materials with enhanced stability in a harsh environment for an MEMS energy harvesting device

Luo

Zhang

et al. 2021

Microsyst Nanoeng

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The charge stability of electret materials can directly affect the performance of electret-based devices such as electrostatic energy harvesters. In this paper, a spray-coating method is developed to deposit an electret layer with enhanced charge stability. The long-term stability of a spray-coated electret is investigated for 500 days and shows more stable performance than a spin-coated layer. A second-order linear model that includes both the surface charge and space charge is proposed to analyze the charge decay process of electrets in harsh environments at a high temperature (120 °C) and high humidity (99% RH); this model provides better accuracy than the traditional deep-trap model. To further verify the stability of the spray-coated electret, an electrostatic energy harvester is designed and fabricated with MEMS (micro-electromechanical systems) technology. The electret material can work as both the bonding interface and electret layer during fabrication. A maximum output power of 11.72 μW is harvested from a vibrating source at an acceleration of 28.5 m/s2. When the energy harvester with the spray-coated electret is exposed to a harsh environment (100 °C and 98% RH), an adequate amount of power can still be harvested even after 34 h and 48 h, respectively.

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“…Ferroelectrets have been used for many different applications including microphones [ 18 ], energy harvesting [ 19 , 20 , 21 ], wearable devices [ 22 ] and flexible and printable sensors (FLEPS) [ 23 ], flexible touch pads and tactile sensors [ 24 ], and air-coupled ultrasonic transducers [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. In the latter case, the main advantage is the extremely low acoustic impedance of these materials that facilitates the coupling to the air; they are normally operated using the thickness resonances of the films.…”

Section: Introductionmentioning

confidence: 99%

“…Ferroelectrets have been used for many different applications including microphones [18], energy harvesting [19][20][21], wearable devices [22] and flexible and printable sensors (FLEPS) [23],…”

Section: Introductionmentioning

confidence: 99%

Modification of Mechanical and Electromechanical Resonances of Cellular Ferroelectret Films Depending on the External Load

Aguilar

Álvarez-Arenas

2021

Polymers

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Ferroelectret films are cellular polymers with electrically charged pores that exhibit piezoelectric response. Among other applications, ferroelectret films have been widely used as active elements in air-coupled ultrasonic transducers. More recently, they have also been tested in water immersion. They show a promising wide frequency band response, but a poor sensitivity produced by the disappearance of the electromechanical resonances. This paper studies in detail the modification of FE films response when put into water immersion, both the mechanical and the electromechanical responses (the latter in transmission and reception modes). The lack of electromechanical thickness resonances when the films are put into water is explained as the result of the different profile of the modification of the polarization vector along the film thickness imposed by the large mechanical load produced by the water. This different electromechanical response can also be the reason for the subtle modification of the mechanical thickness resonances that is also observed and analyzed.

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Flexible film-transducers based on polypropylene piezoelectrets: Fabrication, properties, and applications in wearable devices

Cited by 26 publications

References 46 publications

Hierarchical Honeycomb-Structured Electret/Triboelectric Nanogenerator for Biomechanical and Morphing Wing Energy Harvesting

Hierarchical Honeycomb-Structured Electret/Triboelectric Nanogenerator for Biomechanical and Morphing Wing Energy Harvesting

Spray-coated electret materials with enhanced stability in a harsh environment for an MEMS energy harvesting device

Modification of Mechanical and Electromechanical Resonances of Cellular Ferroelectret Films Depending on the External Load

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