Understanding the Role of Soft X-ray in Charging Solid-Film and Cellular Electrets

Feng, Yue; Rao, Zehong; Song, Ki-Young; Tang, Xusong; Zhou, Zhen; Xiong, Ying

doi:10.3390/nano12234143

Cited by 3 publications

(2 citation statements)

References 38 publications

(54 reference statements)

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“…The minimum dynamic pull‐in surface potential, which is determined by the maximum external excitation, is the charging limit of the electret film, which should not be exceeded to prevent HPEVEH from the pull‐in phenomenon. Moreover, according to Paschen's law, the surface potentials of electret initiating the breakdown of the 0.5 mm air gap and 1.0 mm air gap are approximately −2500 and −3400 V, which also are the charging limits of the electret film [26].…”

Section: Resultsmentioning

confidence: 99%

“…Owing to its high dielectric strength and high surface charge density, polytetrafluoroethylene is chosen for the electret material and is glued onto the substrate with conductive copper tape. The electret film was charged using the 10 keV soft X-ray, which has strong penetration ability through the piezoelectric cantilever and achieve the polarisation of electret after package [25,26]. In practice, a high voltage is applied to the back electrode of the electret film, and the surface potential of electret can be in situ changed by adjusting the high voltage.…”

Section: Property Valuementioning

confidence: 99%

See 1 more Smart Citation

Frequency‐tunable resonant hybrid vibration energy harvester using a piezoelectric cantilever with electret‐based electrostatic coupling

Feng

Zhou

Luo

et al. 2023

IET Nanodielectrics

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Hybrid vibration energy harvesting technology converts vibration energy into electricity using multiple transduction mechanisms to improve output power. A frequency‐tunable resonant hybrid vibration energy harvester using a piezoelectric cantilever with electret‐based electrostatic coupling is proposed in this article. The electrostatic coupling including electrostatic force coupling and electrical damping coupling is introduced by an electret film placed below the cantilever, where the electrostatic force acting on the cantilever realises a tunable resonant frequency and additional electrical damping boosts power output. A coupling electromechanical model is derived using Euler–Bernoulli beam theory and Kirchhoff's law. By investigating the static and dynamic stability of cantilever, the maximum electret surface potential is defined to prevent the pull‐in phenomenon. The damping of the device is evaluated, and the optimal electret surface potential is determined to obtain the matching of the electrical and mechanical damping for maximum power output. The resonant frequency of hybrid vibration energy harvester can be adjusted in range of 176.1 rad/s by changing the electret surface potential and resistive load. The experimental output power of hybrid vibration energy harvester was 5.2 μW, 27.4 times higher than that of the individual piezoelectric generator. The proposed hybrid vibration energy harvester exhibits a promising potential to power microelectronic devices and wireless sensor network node.

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Section: Resultsmentioning

confidence: 99%

Section: Property Valuementioning

confidence: 99%

Frequency‐tunable resonant hybrid vibration energy harvester using a piezoelectric cantilever with electret‐based electrostatic coupling

Feng

Zhou

Luo

et al. 2023

IET Nanodielectrics

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Advances in Piezoelectret Materials‐Based Bidirectional Haptic Communication Devices

Gong,

Zhang,

Lei

et al. 2024

Advanced Materials

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Bidirectional haptic communication devices accelerate the revolution of virtual/augmented reality and flexible/wearable electronics. As an emerging kind of flexible piezoelectric materials, piezoelectret materials can effortlessly convert mechanical force into electrical signals and respond to electrical fields in a deformation manner, exhibiting enormous potential in the construction of bidirectional haptic communication devices. Existing reviews on piezoelectret materials primarily focus on flexible energy harvesters and sensors, and the recent development of piezoelectret‐based bidirectional haptic communication devices has not been comprehensively reviewed. Herein, a comprehensive overview of the materials construction, along with the recent advances in bidirectional haptic communication devices, is provided. First, the development timeline, key characteristics, and various fabrication methods of piezoelectret materials are introduced. Subsequently, following the underlying mechanisms of bidirectional electromechanical signal conversion of piezoelectret, strategies to improve the d33 coefficients of materials are proposed. The principles of haptic perception and feedback are also highlighted, and representative works and progress in this area are summarized. Finally, the challenges and opportunities associated with improving the overall practicability of piezoelectret materials‐based bidirectional haptic communication devices are discussed.

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More efficient charging of ferroelectrets via tuning of the Paschen breakdown

Qiu

Liu

et al. 2023

Applied Physics Letters

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Charging by means of dielectric barrier discharges (DBDs) is a critical step in the preparation of ferroelectrets (also called piezoelectrets). Triggering of the DBD charging in ferroelectrets is governed by Paschen's law. The Paschen-breakdown voltage [Formula: see text] of common gases exhibits a U-shaped dependence on the product of gas pressure p and electrode spacing d (internal-cavity height in the present ferroelectret context). This allows for a more efficient charging strategy for ferroelectrets whose pd value at atmospheric pressure is different from the [Formula: see text] value of the Paschen-breakdown curve. For easier triggering of the DBD charging, the pd is adjusted toward [Formula: see text] (corresponding to [Formula: see text] of the Paschen curve) by controlling the gas pressure in the cavity. Subsequently, pd is restored to its value at ambient pressure under the charging voltage in order to obtain a high remanent polarization. The proposed charging scheme is easy to operate and can significantly improve the charging efficiency of ferroelectrets with a wide range of cavity geometries.

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Understanding the Role of Soft X-ray in Charging Solid-Film and Cellular Electrets

Cited by 3 publications

References 38 publications

Frequency‐tunable resonant hybrid vibration energy harvester using a piezoelectric cantilever with electret‐based electrostatic coupling

Frequency‐tunable resonant hybrid vibration energy harvester using a piezoelectric cantilever with electret‐based electrostatic coupling

Advances in Piezoelectret Materials‐Based Bidirectional Haptic Communication Devices

More efficient charging of ferroelectrets via tuning of the Paschen breakdown

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