Spray coating of polymer electret with polystyrene nanoparticles for electrostatic energy harvesting

Xu, Yixin; Luo, Anxin; Ai, Zhang; Tang, Bin; Wang, Kai; Wang, Fei

doi:10.1049/mnl.2016.0336

Cited by 31 publications

(8 citation statements)

References 29 publications

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“…Commercially available polyvinylidene fluoride (PVDF) has been widely studied in micro‐electric devices, including electromechanical sensing and energy harvesting devices owing to its flexibility, light‐weight, biocompatibility, and long‐term stability. Current research is focused on enhancing the active piezoelectric crystal phases of this material, namely the β phase .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Piezoelectric Performance of Electrospun Polyvinylidene Fluoride Doped with Inorganic Salts

Mao

Yu³

et al. 2017

Macro Materials & Eng

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A novel approach to preparing electrospun polyvinylidene fluoride (PVDF) nanofibers is proposed, with high piezoelectric performance. PVDF nanofibers are doped with inorganic salts without the use of any postpolarization treatment. Twenty‐six salts are doped into the nanofibers and their piezoelectric properties are studied. The salts are classified into three groups based on their differing piezoelectric enhancement effects. A piezoelectric nanogenerator fabricated with an optimized electrospun PVDF nanofiber mat shows a piezovoltage seven times greater than that of a device based on undoped nanofibers. The simple and low‐cost approach to fabricate these piezoelectric nanofiber mats may broaden the range of industrial applications of these materials in energy‐harvesting devices and portable sensors.

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Section: Introductionmentioning

confidence: 99%

Enhanced Piezoelectric Performance of Electrospun Polyvinylidene Fluoride Doped with Inorganic Salts

Mao

Yu³

et al. 2017

Macro Materials & Eng

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“…1 The proposed spray-coating method for electret material with nanoparticles. a Schematic of the electret material deposited by spray coating and small bubbles and PS nanoparticles are introduced by spray coating, which could be helpful for trapping more space charges; b photograph of a spray-coated electret with many bubbles; c SEM image of a nanoparticle on an electret layer; Table 1: Samples prepared by spin and spray-coating methods process have been described in our previous report 44 and in the Supplementary Materials (Fig. S1).…”

Section: Resultsmentioning

confidence: 99%

“…Thyssen et al 41 also improved the charge stability at high temperature and high humidity by controlling the crystallinity of polypropylene electret material; this improvement was achieved by mixing isotacticpolypropylene and atactic-polypropylene. In addition to these endeavors, some surface treatment methods and a spray-coating method were proposed and proved to be good methods for film deposition and enhanced performance according to our previous work 20,[42][43][44] .…”

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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“…One of the means of fabricating electrets is spray coating [33]. The method is particularly suitable for incorporating electrets in power-dense applications comprised of laminated structures owing to its versatility.…”

Section: B Spray Coated Electretmentioning

confidence: 99%

Electret: An Entirely New Approach of Solving Partial Discharge Caused by Triple Points, Sharp Edges, Bubbles, and Airgaps

Park

2020

IEEE Access

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For the vast majority of applications that involve medium-to-high-voltage operation, partial discharge (PD) has been a chronic issue that causes accelerated dielectric material aging and device failure. Nowadays, with the increasing power density of various medium-to-high-voltage applications, the dielectric challenges introduced by PD are increasing. However, the elimination of PD has been considered virtually impossible due to manufacturing defects that are unavoidable. In this paper, we introduce an entirely new approach that utilizes electrets as a solution to the dielectric challenges caused by PD. Here, we theoretically show that the incorporation of electret layers substantially reduces the undesired high electric fields that promote PD activities. The results suggest that high electric field around sharp edges, triple points, airgaps, and bubbles can be reduced substantially either by controlling the distance between an electret layer and a high-field surface or by tailoring the surface charge density of the electret layers. The required distance and surface charge density for electric field mitigation are theoretically derived and confirmed by finite element analysis. We demonstrate the validity of the proposed method by applying it to laminated structures, in which triple points, airgaps, and bubbles exist. We also report practical considerations and limitations associated to the proposed use of electrets as a solution to PD. The long-term goal of the research is providing enhanced resiliency to the emerging technologies that involve higher electric field and higher power density. INDEX TERMS Electric stress, partial discharge, laminated busbars, power electronic modules, electret, sharp edges, triple point, airgap, bubble, dielectric material aging, device failure, high field, high power density.

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Spray coating of polymer electret with polystyrene nanoparticles for electrostatic energy harvesting

Cited by 31 publications

References 29 publications

Enhanced Piezoelectric Performance of Electrospun Polyvinylidene Fluoride Doped with Inorganic Salts

Enhanced Piezoelectric Performance of Electrospun Polyvinylidene Fluoride Doped with Inorganic Salts

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

Electret: An Entirely New Approach of Solving Partial Discharge Caused by Triple Points, Sharp Edges, Bubbles, and Airgaps

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