Toward enhanced output performance by optimizing permittivity of capacitor medium in electret-based energy harvester

Lai, Wenhui; Lou, Qihong; Zhang, Jianfeng; Fan, Zhankui; Wang, Qi; Park, Chul Hong; Chen, Gangjin

doi:10.1016/j.nanoen.2022.107057

Cited by 8 publications

(7 citation statements)

References 40 publications

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“…Only part of the nanofibers is effectively stressed, while the rest is not. PDMS has a quite low Young's modulus of ≈0.25 MPa, [ 61 ] and therefore filling electrospun PVDF with PDMS will not lead to a significant increase of the Young's modulus of the samples. Namely, the PVDF/PDMS films are still very soft.…”

Section: Resultsmentioning

confidence: 99%

Fully Transparent Flexible Piezoelectric Sensing Materials Based on Electrospun PVDF and Their Device Applications

Qiu,

Bian,

Mei

et al. 2024

Adv Materials Technologies

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Advanced transducer materials have become increasingly important with the rapid development of the internet of things and flexible electronics. Herein, fully transparent flexible polyvinylidene fluoride/polydimethylsiloxane (PVDF/PDMS) composite piezoelectric films are fabricated using scrape coating techniques based on electrospun PVDF nanofiber films. Compared to the electrospun PVDF, the PVDF/PDMS not only owns high transparency and a more uniform and stable structure but also has superior piezoelectric properties. Based on the electrospun PVDF and the PVDF/PDMS films, flexible piezoelectric sensors are developed, which can effectively detect weak mechanical signals including finger tapping and bending signals, radial artery pulses, and environmental sound signals. The PVDF/PDMS sensor performs better than the electrospun PVDF sensor and presents great potential for applications in flexible sensors and transducers. Especially, thanks to their high transparency, the PVDF/PDMS composite piezoelectric films lend themselves easily to application fields requiring transparent sensors such as imperceptible sensors and human‐machine interfaces, display devices, electronic skins, intelligent windows, etc.

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Section: Resultsmentioning

confidence: 99%

Fully Transparent Flexible Piezoelectric Sensing Materials Based on Electrospun PVDF and Their Device Applications

Qiu,

Bian,

Mei

et al. 2024

Adv Materials Technologies

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“…By combining these zero-dimensional materials with electrochemical properties and dielectric materials, composite triboelectric surfaces can be prepared with higher performance than pure dielectric materials. One-dimensional materials, such as carbon nanotubes 64 or silver nanowires 30 , are flexible. Doping them into raw materials can be used as efficient triboelectric materials or carrier transport channels.…”

Section: Power Generation Efficiency Influencing Factorsmentioning

confidence: 99%

“…Multi-walled carbon nanotubes (CNTs-010-0) and PDMS dispersion liquid are fully mixed in 64 , and then stirred at 120 °C for 10 min, followed by mixing with a coagulant at the ratio of 10:1. Afterwards, 5.5 g of the mixture is allowed to spread naturally on a horizontal plane at 60 °C for 2 h. Then, a layer of insulator film is formed, which forms a film used as the electret on triboelectric layer with the output power of 1.549 mW and power density of 0.968 W/m 2 under the load of 10 MΩ.…”

Section: Power Generation Efficiency Influencing Factorsmentioning

confidence: 99%

Recent advances in solid–liquid triboelectric nanogenerator technologies, affecting factors, and applications

Yuan,

Guo

2024

Sci Rep

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Converting dispersed mechanical energy into electrical energy can effectively improve the global energy shortage problem. The dispersed mechanical energy generated by liquid flow has a good application prospect as one of the most widely used renewable energy sources. Solid–liquid triboelectric nanogenerator (S–L TENG) is an inspiring device that can convert dispersed mechanical energy of liquids into electrical energy. In order to promote the design and applications of S–L TENG, it is of vital importance to understand the underlying mechanisms of energy conversion and electrical energy output affecters. The current research mainly focuses on the selection of materials, structural characteristics, the liquid droplet type, and the working environment parameters, so as to obtain different power output and meet the power supply needs of diversified scenarios. There are also studies to construct a theoretical model of S–L TENG potential distribution mechanism through COMSOL software, as well as to obtain the adsorption status of different kinds of ions with functional groups on the surface of friction power generation layer through molecular dynamics simulation. In this review, we summarize the main factors affecting the power output from four perspectives: working environment, friction power generation layer, conductive part, and substrate shape. Also summarized are the latest applications of S–L TENG in energy capture, wearable devices, and medical applications. Ultimately, this review suggests the research directions that S–L TENG should focus on in the future to enhance electrical energy output, as well as to expand the diversity of application scenarios.

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“…180 Research on improving the environmental adaptability of piezoelectric materials, such as material modification and structural optimization to enhance stability under high temper-ature and high humidity conditions, also provides beneficial references for the improvement of electret materials. 181 By drawing on these strategies, electret materials with better charge stability can be developed, which play a key role in various highperformance sensors and energy-harvesting devices. Moreover, to improve the stability of electret charge, optimizing the preparation process of electrets, controlling polarization conditions, and carrying out appropriate annealing treatments are also an effective means to enhance charge stability.…”

Section: Bioactive Electret Materialmentioning

confidence: 99%

“…Research on improving the environmental adaptability of piezoelectric materials, such as material modification and structural optimization to enhance stability under high temperature and high humidity conditions, also provides beneficial references for the improvement of electret materials . By drawing on these strategies, electret materials with better charge stability can be developed, which play a key role in various high-performance sensors and energy-harvesting devices.…”

Section: Bioelectret Materials and Their Classificationmentioning

confidence: 99%

Bioelectret Materials and Their Bioelectric Effects for Tissue Repair: A Review

Li,

Xie,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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Biophysical and clinical medical studies have confirmed that biological tissue lesions and trauma are related to the damage of an intrinsic electret (i.e., endogenous electric field), such as wound healing, embryonic development, the occurrence of various diseases, immune regulation, tissue regeneration, and cancer metastasis. As exogenous electrical signals, such as conductivity, piezoelectricity, ferroelectricity, and pyroelectricity, bioelectroactives can regulate the endogenous electric field, thus controlling the function of cells and promoting the repair and regeneration of tissues. Materials, once polarized, can harness their inherent polarized static electric fields to generate an electric field through direct stimulation or indirect interactions facilitated by physical signals, such as friction, ultrasound, or mechanical stimulation. The interaction with the biological microenvironment allows for the regulation and compensation of polarized electric signals in damaged tissue microenvironments, leading to tissue regeneration and repair. The technique shows great promise for applications in the field of tissue regeneration. In this paper, the generation and change of the endogenous electric field and the regulation of exogenous electroactive substances are expounded, and the latest research progress of the electret and its biological effects in the field of tissue repair include bone repair, nerve repair, drug penetration promotion, wound healing, etc. Finally, the opportunities and challenges of electret materials in tissue repair were summarized. Exploring the research and development of new polarized materials and the mechanism of regulating endogenous electric field changes may provide new insights and innovative methods for tissue repair and disease treatment in biological applications.

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Toward enhanced output performance by optimizing permittivity of capacitor medium in electret-based energy harvester

Cited by 8 publications

References 40 publications

Fully Transparent Flexible Piezoelectric Sensing Materials Based on Electrospun PVDF and Their Device Applications

Fully Transparent Flexible Piezoelectric Sensing Materials Based on Electrospun PVDF and Their Device Applications

Recent advances in solid–liquid triboelectric nanogenerator technologies, affecting factors, and applications

Bioelectret Materials and Their Bioelectric Effects for Tissue Repair: A Review

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