IET Nanodielectrics最新文献

{"title":"Research progress of intrinsic polymer dielectrics with high permittivity","authors":"Kaijin Chen,&nbsp;Zunchu Liu,&nbsp;Weiwen Zheng,&nbsp;Siwei Liu,&nbsp;Zhenguo Chi,&nbsp;Jiarui Xu,&nbsp;Yi Zhang","doi":"10.1049/nde2.12054","DOIUrl":"10.1049/nde2.12054","url":null,"abstract":"<p>The high permittivity of polymer dielectrics facilitates their use in the electronics industry. Compared to inorganic ceramics and composites, intrinsic high permittivity polymer dielectrics have the advantages of easy solution processing and better homogeneity. The permittivity of common polymers is generally low, hence it would be worthwhile to explore avenues for augmenting the permittivity of polymer dielectrics via judicious and efficient structural design. The effective strategies used to increase the permittivity of intrinsic polymers encompass elevating local polarisabilities by fortifying electron delocalisation capabilities, exploiting ion pairs to generate atomic clusters with larger dipole moments, amplifying dipole density, augmenting dipole mobility, and so forth. Due to the rigidity and flexibility of the polymer backbone's decisive influence on the dielectric's all-around performance, its selection also requires a total consideration of the requirements of practical applications. This work provides an overview and a brief evaluation of the dominant design strategies and mentions possible future design paradigms for polymer dielectrics.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"182-211"},"PeriodicalIF":2.7,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12054","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42474441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Competitive relationship between electrical degradation and healing in self-healing dielectric polymers","authors":"Lu Han,&nbsp;Jiaye Xie,&nbsp;Qi Li,&nbsp;Jinliang He","doi":"10.1049/nde2.12056","DOIUrl":"10.1049/nde2.12056","url":null,"abstract":"<p>The concept of self-healing dielectric polymers has been heatedly discussed, with the expectation of high damage resistance and longer service time. However, there is still a lack of analysis on the competitive relationship between electrical degradation and self-healing. The authors discussed this relationship in two stages: the design of self-healing strategies and the operation of self-healing polymers. Since the requirements for excellent insulating or mechanical properties are not consistent with the demands for high self-healing capability, trade-offs are necessary during the design of self-healing polymeric systems. In the operation stage of dielectric polymers, some key factors that affect the service lifetime of non-autonomous self-healing dielectric polymers are analysed, including the efficiency and repeatability of self-healing, and the frequency of healing maintenance. For autonomous self-healing dielectrics, the simultaneous processes of ageing and healing are investigated using a self-healing epoxy resin based on microcapsules and <i>in situ</i>-generated radicals. A quicker recovery of insulating properties, in terms of partial discharge magnitude, was observed under appropriate healing voltages. However, the self-healing ability might vanish when the voltage was too high, verifying the competitive relationship between electrical degradation and self-healing.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"231-236"},"PeriodicalIF":2.7,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43255234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Guest Editorial: Polymer electrets and ferroelectrets","authors":"Xunlin Qiu,&nbsp;Xiaoqing Zhang,&nbsp;Feipeng Wang,&nbsp;Dmitry Rychkov","doi":"10.1049/nde2.12057","DOIUrl":"https://doi.org/10.1049/nde2.12057","url":null,"abstract":"&lt;p&gt;Electrets are functional dielectrics capable of quasi-permanently storing electric charges at their surface and/or in their bulk. The electret charges are either real charges (space charges) or oriented dipoles (polarisation). Traditionally, electrets are divided into space-charge (non-polar) electrets and dipole (polar) electrets. Ferroelectrets (also called piezoelectrets) are a relatively young member added to the electret family around the end of the last century. These are non-polar polymer foams or cavity-containing polymer-film systems. The air-filled cavities carry positive and negative charges on their top and bottom internal surfaces, respectively, and thus can be considered as macroscopic dipoles, the direction of which can be switched by reversing the polarity of the charging voltage. Therefore, ferroelectrets are non-polar space-charge electrets with ferroic behaviour phenomenologically the same with that of traditional ferroelectrics.&lt;/p&gt;&lt;p&gt;Polymer electrets and ferroelectrets may show peculiar functionalities such as electrostatic effect, piezo-, pyro- and ferroelectricity, biological effects, non-linear optical effects, and therefore attract extensive attention from academia and industry. This special issue collects some of the latest advancements in the field of polymer electrets and ferroelectrets. In total, nine papers are accepted, which cover a wide scope of topics. One paper (of Yan et al.) presents the fundamental open-circuit thermally stimulated discharge technique for electrets. Two papers (of Yang et al. and Feng et al.) study electrets employed in energy harvesters. The papers of Chen et al. and of Jiang et al. propose an electret-based electrostatic motor that can generate a power up to 5.4 mW and electrospun PVDF microfiber sensors capable of capturing weak mechanical signals, respectively. Two papers (of Sun et al. and Wang et al.) report biological effects in electrets. The paper of Ul Hag and Wang investigates the surface potential of epoxy electrets in relation to their insulation properties, while the paper of Wang et al. brings forth compound-structured ferroelectrets that can be used as wearable devices for health monitoring. In the following a brief presentation of each paper in this special issue is given.&lt;/p&gt;&lt;p&gt;Yan B. et al. propose a glass-assisted open-circuit thermally stimulated discharge (GA-OCTSD) technique. The newly developed technique is applied to study fluorinated ethylene-propylene copolymer (FEP) electret films. The influences of the glass thickness, glass dielectric properties, and glass metallisation on the GA-OCTSD spectra are investigated. It turns out that the GA-OCTSD can clearly distinguish contributions from surface charge and bulk/volume charge, which is not feasible with traditional air-gap OCTSD.&lt;/p&gt;&lt;p&gt;Yang X. et al. report a resilient electret film-based vibrational energy harvester with a V-shaped counter electrode. A negatively charged wavy-shaped FEP electret film generates si","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 2","pages":"33-35"},"PeriodicalIF":2.7,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50125117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A compound-structured piezoelectret system and its applications in wearable health monitoring","authors":"Shuting Wang,&nbsp;Shizhe Lin,&nbsp;Jianglang Cao,&nbsp;Guanglin Li,&nbsp;Peng Fang","doi":"10.1049/nde2.12055","DOIUrl":"10.1049/nde2.12055","url":null,"abstract":"<p>Piezoelectrets, also called ferroelectrets, can exhibit promising piezoelectric properties and have plenty of applications in wearable health monitoring. Usually, the cellular structure of piezoelectrets is of outstanding importance for their sensing properties, and structure improvement and optimisation would be a possible way to realise high-performance piezoelectrets. The authors proposed a compound-structured piezoelectret system, where a layer of polypropylene foam was sandwiched between two layers of solid polytetrafluoroethylene, resulting in a combination of a foam-structured and a layer-structured piezoelectrets. The compound systems are thin and flexible, they can exhibit stable electrical outputs, they have relatively broader linear working range under pressure, and promising mechanical sustainability for multiple testing. The results reveal that the compound system can be considered as a simple addition of both components, and each component contributes linearly and independently to the whole system. The application potential of this proposed compound system has been demonstrated by sleep monitoring together with carotid and radial pulse recordings, where many useful physiological information including breath, heartbeat, and pulse details can be extracted from the signals acquired by the compound system. A type of flexible sensor system that is very competitive for future portable and wearable applications may be provided.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"257-266"},"PeriodicalIF":2.7,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43499282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Near-field electrospinning fabrication of piezoelectric polymer microfiber sensors for detection of weak mechanical excitation","authors":"Hanxiao Jiang,&nbsp;Xingsheng Luo,&nbsp;Qiusong Chen,&nbsp;Fan Xu,&nbsp;Guodong Zhu,&nbsp;Zaixiu Jiang,&nbsp;Anna A. Guliakova","doi":"10.1049/nde2.12053","DOIUrl":"10.1049/nde2.12053","url":null,"abstract":"<p>Collection and conversion of widespread mechanical energy is one promising way to alleviate environmental pollution and energy crisis. Piezoelectric materials can effectively realise this conversion between mechanical and electrical energies. Here, via near-field electrospinning, piezoelectric poly(vinylidene fluoride) microfibers were fabricated on flexible polyethylene terephthalate substrate. Bending measurement indicated that open-circuit voltage response from piezoelectric microfibers was strain dependent but insensitive to bending frequency. The microfiber sensor could detect acoustic signals with sound pressure level between 70 and 120 dB and the recorded acoustic frequency was well consistent with the nominal frequency. Light wind from a low-power hand fan was also detected by this microfiber sensor. This simply structured and highly flexible piezoelectric microfiber sensor provided a promising and low-cost fabrication measure for weak mechanical excitation sensing.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 2","pages":"64-72"},"PeriodicalIF":2.7,"publicationDate":"2023-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42400951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research progress of intrinsic polymer dielectrics with high thermal conductivity","authors":"Wenying Zhou,&nbsp;Tian Yao,&nbsp;Mengxue Yuan,&nbsp;Yating Yang,&nbsp;Jian Zheng,&nbsp;Jing Liu","doi":"10.1049/nde2.12052","DOIUrl":"10.1049/nde2.12052","url":null,"abstract":"<p>Heat dissipation has become an important challenge and technical bottleneck for the rapid development of high-frequency microelectronic devices and high-voltage electrical equipment. Thus, there is a great urgent need for high-performance intrinsically thermally conductive polymer (ITCP) to realise effective heat dissipation. In recent year, the ITCP has received extensive attention due to excellent overall performances and clear advantages over conventional heat conductive polymer composites. The thermal transport physics and its relation with the multiscale chain conformations in polymers with diverse morphologies are reviewed. Then, the current understanding of how the chemistry of polymers, multiscale chain morphologies and conformations would affect phonon transport and the resulting thermal conductivity (TC) in both amorphous and crystalline polymers to unveil the important chemistry-structure-property relationships is discussed and anaysed. The latest advances in engineering ITCP from oriented fibre to bulk amorphous states for a high TC are summarised. Lastly, the challenges, prospects and outlook of ITCP have been proposed. The authors anticipate that the present paper will spire more fundamental and applied research in the intrinsic polymer dielectrics field to advance scientific understanding and industrial applications.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 4","pages":"165-181"},"PeriodicalIF":2.7,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12052","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47439092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical magnetic field sensors based on nanodielectrics: From biomedicine to IoT-based energy internet","authors":"Jia-Wei Zhang,&nbsp;Xuan Meng,&nbsp;Tao Han,&nbsp;Xiaofei Wei,&nbsp;Liang Wang,&nbsp;Yu Zhao,&nbsp;Geng Fu,&nbsp;Ning Tian,&nbsp;Qian Wang,&nbsp;Sichen Qin,&nbsp;Xiaoxu Liu,&nbsp;Chatchai Putson","doi":"10.1049/nde2.12049","DOIUrl":"10.1049/nde2.12049","url":null,"abstract":"<p>Smart sensors with excellent performance are accelerating the development of biomedicine and the Internet of Energy. Nanodielectrics exhibit unique electrical and mechanical properties. As the predominant materials in optical magnetic field sensor (MFS), they can not only exert the anti-interference of optical sensing, but improve the measuring characteristics of optical sensors. For instance, the optical fibre quantum probe for the magnetic field can obtain a higher sensitivity of 0.57 nT/Hz^1/2, while the measurement range of the sensor that uses Co-doped ZnO nanorods as cladding is 17–180 mT. Here, these exciting recent achievements in the realm of optical sensing methods for magnetic field detection are reviewed, with a focus on nanodielectrics, which provide an emerging opportunity to achieve higher sensitivity and a wider measurement range of MFS.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 3","pages":"116-129"},"PeriodicalIF":2.7,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12049","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43317471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polymer-based nanocomposites in semiconductor packaging","authors":"Tengyu Li,&nbsp;Peng Li,&nbsp;Rong Sun,&nbsp;Shuhui Yu","doi":"10.1049/nde2.12050","DOIUrl":"10.1049/nde2.12050","url":null,"abstract":"<p>Semiconductor packaging materials play a critical role in the development of semiconductor devices. They not only provide reliable protection and support, but also contribute to the electrical connection between the chip and the external circuit. Among many choices of packaging materials, polymer-based nanocomposites have become the mainstream candidate due to their low cost, easy processability, and tunable properties. Materials with low dielectric constant and dielectric loss, high glass transition temperature, fast thermal conductivity, suitable coefficient of thermal expansion, low viscosity, and good processability are commonly required in semiconductor packaging, yet most polymers do not meet these criteria. Therefore, modulation of the polymer matrix, introduction of suitable fillers, and modification of the filler surface are often effective approaches to enhance the performance of the composites. Here, the authors first review current research progresses of polymer-based nanocomposites for five different types of packaging applications, namely moulding compounds, thermal interface materials, underfills, die attach materials, and substrates. The authors then present prospects of developing next-generation polymer-based nanocomposites for advanced semiconductor packaging and propose some suggestions to solve the existing challenges.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 3","pages":"147-158"},"PeriodicalIF":2.7,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12050","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42121235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electret prevents the formation of bacterial biofilm","authors":"Zhipeng Sun,&nbsp;Hongbao Wang,&nbsp;Xin Guo,&nbsp;Jiajie Xu,&nbsp;Hejuan Liang,&nbsp;Jian Jiang,&nbsp;Yuanyuan Liang","doi":"10.1049/nde2.12051","DOIUrl":"10.1049/nde2.12051","url":null,"abstract":"<p>Bacterial biofilm formation is an important factor in bacterial resistance. The commonly used methods to inhibit bacterial biofilms are synthetic drugs such as antimicrobial peptides, but physical methods are often safe, non-toxic and simple to prepare. This work proposes an environmentally friendly method to use electret films to provide a stable electric field during the formation of bacterial biofilms, inhibit the formation of bacterial biofilms through the action of the electric field and weaken the adhesion of bacterial biofilms. The total amount of <i>Staphylococcus aureus</i> biofilm decreased by 20% compared to the control group after the treatment of positive electret. The distribution of exopolysaccharides showed that the activity of biofilm also decreased. In addition, the negative electret can also inhibit the formation of bacterial biofilm. The result can be generalised to other Gram-positive bacteria and could contribute to reduce the resistance of bacteria, improve the effect of related antibiotics, reduce the dosage of antibiotics and reduce the side effects of drugs.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 2","pages":"57-63"},"PeriodicalIF":2.7,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12051","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48390405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eco-friendly polypropylene power cable insulation: Present status and perspective","authors":"Jianying Li,&nbsp;Kai Yang,&nbsp;Kangning Wu,&nbsp;Zhenghong Jing,&nbsp;Jin-Yong Dong","doi":"10.1049/nde2.12048","DOIUrl":"10.1049/nde2.12048","url":null,"abstract":"<p>Environmental protection is the future trend of power equipment development, and is also a research hotspot in the field of power cable insulation in recent years. Due to the excellent electrical properties and recyclability, polypropylene (PP) based composites are regarded as promising insulating materials for eco-friendly next-generation power cables. However, the high modulus and hardness of pure PP make it difficult to be directly employed as cable insulations, which needs to be further optimised. General methods of mechanical performance regulation often result in the deterioration of electrical performance, such as breakdown strength, space charge and so on. Therefore, it is recognised that the major challenge impeding practical applications of PP power cable insulation arises from the synergetic regulation of multi-performances. The multi-level structures influencing the multi-performances of PP are introduced by the authors and the researches on the performance enhancement of PP through nanoscale structure regulation in recent years are reviewed in detail. Seven kinds of modification methods including nano-doping, chemical grafting, in-suit copolymerisation, heat treatment, nucleating agent, voltage stabiliser and elastomer blending are paid special attention. Based on the full understanding of the research status, the challenges and issues of future research are put forward for eco-friendly PP power cable insulation.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":"6 3","pages":"130-146"},"PeriodicalIF":2.7,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47989326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}