Electret and Dielectric Properties of Lyophilized Polymer Films

Bodurov, I; Viraneva, A.; Yovcheva, T.

doi:10.1088/1742-6596/1186/1/012013

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…There have been numerous recent advancements in the study of charge trapping in fluoropolymer/dielectrics. − The properties of electrets in fluoropolymers have been the subject of several recent investigations. , The findings obtained from the charge distribution profile have substantially increased our understanding of the charging phenomena in electrets. , According to Sessler et al ., an electret is a dielectric substance that exhibits dipole polarizations or a quasi-permanent electric charge that is typically characterized by an external electric field . The term “quasi-permanent charge” refers to charge decaying over a significantly longer period than the experiment’s duration.…”

Section: Introductionmentioning

confidence: 99%

Determination of Surface Charge Density and Charge Mapping of CYTOP Film in Air using Electrostatic Force Microscopy

Singh,

Weber,

Mallick

et al. 2024

Langmuir

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Cyclic transparent optical polymer (CYTOP), a fluoropolymer, finds a plethora of applications in microelectronic devices for sustainable energy harvesting and memory devices. By and large, these devices demand high voltage breakdown, a high dielectric constant, transparency, charge storage, and retention capabilities. Despite many efforts, comprehensive investigation of the charge distribution, retention, and discharge studies conducted on the CYTOP film at the micro-scale remains elusive. Here, we present direct quantification and mapping of surface charge on the CYTOP surface at room temperature using two different modes of advanced surface probe microscopy i.e., Kelvin probe force microscopy (KPFM) and electrostatic force microscopy (EFM). We estimated that the surface charge densities of the CYTOP film using EFM are 1.4 and 3.3 μC/cm 2 for the injection of positive and negative charges, respectively. Furthermore, we determined the charge retention time for both injected positive and negative charges. We found that the retention capacity of the negative charges on the CYTOP film is much higher as compared to the positive charges. Moreover, it is also observed that injected negative charges are strongly localized on the CYTOP surface compared to the positive counterpart. Additionally, we demonstrated that charge writing is possible on the CYTOP surface using the AFM conductive tip. These results may find potential applications in energy harvesting, sensing, memory devices, security, and surveillance.

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Section: Introductionmentioning

confidence: 99%

Determination of Surface Charge Density and Charge Mapping of CYTOP Film in Air using Electrostatic Force Microscopy

Singh,

Weber,

Mallick

et al. 2024

Langmuir

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show abstract

“…The word, electret, was created by Oliver Heaviside in 1892, to describe dielectric materials with quasi‐permanent space charges or dipoles 1 . To this point, polymer electrets belong to the dielectric materials, which exhibit a dipolar polarization or quasi‐permanent electrical charges 2–4 . It is usually the voided charged polymer film that is prepared in virtue of the electric charging process 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Polymer electrets and their applications

Wang

et al. 2020

J of Applied Polymer Sci

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Polymer electrets have revealed great potential application in electromechanical devices because of the low weight, large quasi‐piezoelectric sensitivity, and excellent flexibility. For an electret, a permanent and macroscopic electric field exists on the surface, principally led by a macroscopic electrostatic charge on the surface or a net orientation of polar groups inside the object. Here, progress in the development of polymer electrets is reviewed. After a brief retrospect of the research courses and those typical polymer electrets that are classified into fluorine polymer and nonfluorine polymer, we present a survey on the charging methods, including corona, soft X‐ray, contact, thermal and monoenergetic particle beams. The latest representative applications (i.e., power harvesting, sensors, field effect transistors, and biomedicine) based on polymer electrets are also summarized. Finally, we complete this review with a discussion on perspectives and challenges in this field.

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“…However, the performance enhancement achieved by these methods is still limited and falls short of meeting the future demand for high-performance self-powered UV PDs.Polymer electrets with high resistivity are capable of trapping and storing charges to form a persistent and stable electrostatic field, attracting great interest in the preparation of highperformance PDs. [29][30][31][32] Recently, Wang et al introduced a thin poly(2-vinyl naphthalene) (PVN) polymer electret layer between the ZnO nanowires and the dielectric gate, [33] which depleted the defect-induced carriers through the electrostatic field generated by trapped electrons in the PVN layer, resulting in a reduction of the dark current by a factor of 1.38 Â 10 5 at 1 V bias. Zhang et al proposed a CuBi 2 O 4 -based PD with a rechargeable fluorinated ethylene propylene copolymer electret layer, which produces a stable electrostatic field within the CuBi 2 O 4 channel capable of…”

mentioning

confidence: 99%

Realization of Self‐Powered High‐Performance Photodetection via Electrostatic Field Enhancement and Dark Current Suppression

Chen,

Lin,

Liu

et al. 2024

Adv Energy and Sustain Res

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Self‐powered photodetectors (PDs) are particularly attractive in the construction of environmentally friendly and sustainable Internet of Things. Utilizing dual functions of PTFE of electrostatic field enhancement and dark current suppression, a high‐performance self‐powered ITO/PTFE/TiO2/GaN UV PD is developed herein. The introduction of PTFE not only significantly reduces the dark current, but also facilitates the separation of photogenerated carriers by coupling the internal electrostatic field at the PTFE/TiO2 interface with the built‐in electric field of the TiO2/GaN heterojunction. With 0 V bias, the light‐to‐dark current (Ilight/Idark) ratio of the PD with PTFE is improved by 2297 times and the response time is faster by 1.69/2.96 times compared to the ITO/TiO2/GaN PD. In addition, a microstructured M‐ITO/PTFE/TiO2/GaN PD with micrometer‐sized cylindrical TiO2 arrays exhibits a high Ilight/Idark ratio of 3.65 × 105, a responsivity of 280.1 mA W−1, a high detectivity of 1.97 × 1013 Jones, and a response time of 4.3/3.0 ms under 360 nm illumination. Our strategy provides a promising way to develop high‐performance self‐powered PD.

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Electret and Dielectric Properties of Lyophilized Polymer Films

Cited by 5 publications

References 7 publications

Determination of Surface Charge Density and Charge Mapping of CYTOP Film in Air using Electrostatic Force Microscopy

Determination of Surface Charge Density and Charge Mapping of CYTOP Film in Air using Electrostatic Force Microscopy

Polymer electrets and their applications

Realization of Self‐Powered High‐Performance Photodetection via Electrostatic Field Enhancement and Dark Current Suppression

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