Flexible PET/EVA-based piezoelectret generator for energy harvesting in harsh environments

Zhong, Junwen; Zhong, Qize; Zang, Xining; Wu, Nan; Li, Wenbo; Chu, Yao; Liu, Lin

doi:10.1016/j.nanoen.2017.05.034

Cited by 79 publications

(68 citation statements)

References 33 publications

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“…The scanning electron microscope (SEM) image (inset in Figure b) shows that two FEP films and one Ecoflex film at the middle (with 2 mm circular holes on the Ecoflex film) are bonded together to form the sandwich structure. After a corona charging process (Figure S2, Supporting Information), megascopic electrical dipoles are formed to induce the piezoelectricity‐like functions . In theory, larger circular hole ratio in the Ecoflex spacer is helpful to increase the performance of our piezoelectret pulse sensor, since the electrical dipole density will be improved.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, we use an active and flexible pulse wave sensing system based on a fluorinated ethylene propylene (FEP)/Ecoflex/FEP sandwich‐structured piezoelectret for piezoelectric‐like detections . Several key features are accomplished from the prototype sensing systems: 1) excellent precision and stability capable of differentiating and classifying pulses from different volunteers coupled with the help of big data analyses; 2) the identification of a common heart problem (arrhythmia) from volunteers who were previously diagnosed in hospitals equipped with advanced and bulky electrocardiogram (ECG) setups; 3) the feasibility in recording and revealing the blood pressure using the pulse sensing system instead of a common blood pressure gauge; and 4) the imitation and recording of 3‐finger pulse palpation signals commonly used by doctors practicing in TCM.…”

Section: Introductionmentioning

confidence: 99%

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Human Pulse Diagnosis for Medical Assessments Using a Wearable Piezoelectret Sensing System

Chu

Zhong

Liu

et al. 2018

Adv Funct Materials

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177

128

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Real-time and continuous monitoring of physiological signals is essential for mobile health, which is becoming a popular tool for efficient and convenient medical services. Here, an active pulse sensing system that can detect the weak vibration patterns of the human radial artery is constructed with a sandwich-structure piezoelectret that has high equivalent piezoelectricity. The high precision and stability of the system result in possible medical assessment applications, including the capability to identify common heart problems (such as arrhythmia); the feasibility to conduct pulse palpation measurements similar to well-trained doctors in Traditional Chinese Medicine; and the possibility to measure and read blood pressure.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201803413.imitate the TCM practice for health assessments without well-trained, real doctors. Previously, human pulse waves have been measured using sensors based on different detection mechanisms, such as optics, [16,17] image processing, [15,18,19] acoustics, [20] and pressure means, [21][22][23][24][25][26][27][28][29] etc. Among these, active pressure sensors based on the working principles of piezoelectricity [21][22][23][24] or triboelectricity [7,8] are the more intuitive and sensitive method to detect pulse waves, as these sensors can accurately and directly reflect the weak vibration of the radial artery to better imitate the pulse diagnosis in TCM. Several vertical contact-separation and single-electrode triboelectric pressure sensors have been published to detect human motion and physiological signals, with advantages of thin, flexible, and excellent sensitivity. [30] However, vertical contact-separation devices are composed of two separated parts, which increases the difficulty of assembly and operation in practice. Single-electrode triboelectric sensors have been proposed to address this issue but the exposed residual charges on the sensor surface can be easily leaked. Piezoelectret is flexible, lightweight, and have large and stable equivalent piezoelectric coefficient for high sensitivity. [25] Furthermore, sensors based on piezoelectret materials can alleviate the aforementioned issues in triboelectric sensors to detect physiological signals.In this work, we use an active and flexible pulse wave sensing system based on a fluorinated ethylene propylene (FEP)/Ecoflex/FEP sandwich-structured piezoelectret for piezoelectriclike detections. [25,26,31] Several key features are accomplished from the prototype sensing systems: 1) excellent precision and stability capable of differentiating and classifying pulses from different volunteers coupled with the help of big data analyses; 2) the identification of a common heart problem (arrhythmia) from volunteers who were previously diagnosed in hospitals equipped with advanced and bulky electrocardiogram (ECG) setups; 3) the feasibility in recording and revealing the blood pressure using the pulse sensing system instead of a ...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Human Pulse Diagnosis for Medical Assessments Using a Wearable Piezoelectret Sensing System

Chu

Zhong

Liu

et al. 2018

Adv Funct Materials

Self Cite

177

128

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“…Wang et al 110 proposed a porous polydimethylsiloxane (PDMS)-based piezoelectret with d 33 values reaching $1500 pC/N. Zhong et al 111 fabricated a sandwich-structured piezoelectret with d 33 values up to 6300 pC/N, as shown in Fig. 8(d).…”

Section: Piezoelectric Polymersmentioning

confidence: 99%

“…Specially designed piezoelectret with good transverse piezoelectricity (high d 31 ) is also developed to covert the tensile energy. 112 111 (e) Load peak current and power density of a sandwichstructured piezoelectret-based energy harvester with respect to different load resistances. 111 Reprinted with permission from Zhong et al, Nano Energy 37, 268 (2017).…”

Section: Piezoelectric Polymersmentioning

confidence: 99%

A comprehensive review on piezoelectric energy harvesting technology: Materials, mechanisms, and applications

Liu

Zhong

Lee

et al. 2018

Applied Physics Reviews

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690

314

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The last decade has witnessed significant advances in energy harvesting technologies as a possible alternative to provide a continuous power supply for small, low-power devices in applications, such as wireless sensing, data transmission, actuation, and medical implants. Piezoelectric energy harvesting (PEH) has been a salient topic in the literature and has attracted widespread attention from researchers due to its advantages of simple architecture, high power density, and good scalability. This paper presents a comprehensive review on the state-of-the-art of piezoelectric energy harvesting. Various key aspects to improve the overall performance of a PEH device are discussed, including basic fundamentals and configurations, materials and fabrication, performance enhancement mechanisms, applications, and future outlooks.

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“…[64] Selfrecovery enables the effects of hostile factors encountered in the ambient atmosphere to be indicating acceptable robustness. [64] To summarize, selection of functional or passive material for any application including harsh environment depend on several factors such as stability, reliability, mechanical and electrical properties, chemical resistance and resistance to several environmental factors that can change the material composition, phase, structure, shape, or basic/derived properties. Similarly, the next paragraphs give some perspective on the selection of substrate material for such applications.…”

Section: Gallium Nitridementioning

confidence: 99%

Flexible and Stretchable Electronics for Harsh‐Environmental Applications

Almuslem

Shaikh

Hussain

2019

Adv Materials Technologies

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Monitoring, measuring and controlling electronic systems in space exploration, automotive industries, downhole oil and gas industries, oceanic environment, geothermal power plants, etc. require materials and processes that can withstand harsh environments. Such harshness can come from the surrounding temperature, varying pressure, intense radiation, reactive chemicals, humidity, salinity, or a combination of any of these conditions. Here, we review recent progress in the development of flexible and stretchable electronic devices for harsh environment applications. We consider studies on how the selection of a specific material is important for a specific application and how the selection of the material plays critical role in sustained performance. We present specific examples for selected applications. We also look at works on methods and designs for achieving flexibility and stretchability in devices designed for harsh environments. Finally, we look at studies on Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation packaging techniques that enable deployment of conventional electronic devices in harsh environment applications and offer a few examples.

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Flexible PET/EVA-based piezoelectret generator for energy harvesting in harsh environments

Cited by 79 publications

References 33 publications

Human Pulse Diagnosis for Medical Assessments Using a Wearable Piezoelectret Sensing System

Human Pulse Diagnosis for Medical Assessments Using a Wearable Piezoelectret Sensing System

A comprehensive review on piezoelectric energy harvesting technology: Materials, mechanisms, and applications

Flexible and Stretchable Electronics for Harsh‐Environmental Applications

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