Article(id=1319973036728631644, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20230566, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1690732800000, receivedDateStr=2023-07-31, revisedDate=1695052800000, revisedDateStr=2023-09-19, acceptedDate=null, acceptedDateStr=null, onlineDate=1792635695868, onlineDateStr=2026-10-22, pubDate=1713542400000, pubDateStr=2024-04-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792635695868, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792635695868, creator=13701087609, updateTime=1792635695868, updator=13701087609, issue=Issue{id=1319973019079000285, tenantId=1146029695717560320, journalId=1263187385517883426, year='2024', volume='52', issue='4', pageStart='1171', pageEnd='1476', issueExtLink='null', onlineDate='null', pubDate='1713542400000', pubDateStr='2024-04-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792635691661, creator='13701087609', updateTime=1792641833008, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1319998777822396474, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1319998777822396475, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1288, endPage=1300, ext={EN=ArticleExt(id=1319973036934152541, articleId=1319973036728631644, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Preparation of Flexible Barium Titanate/Polydimethylsiloxane Composites with Hierarchical Microstructure and Optimization of Dielectric Performance, columnId=1321894869182828764, journalTitle=Journal of the Chinese Ceramic Society, columnName=Special Issue on Dielectric Energy Storage Materials—Research Article, runingTitle=null, highlight=null, articleAbstract=
Introduction Flexible and stretchable electronics have attracted much attention due to their potential applications in wearable devices, robotics, and healthcare. Among various materials, barium titanate (BTO) is a promising candidate for flexible and stretchable electronics because of its high dielectric constant, piezoelectric property, and superior thermal stability. However, the brittle nature of BTO restricts its application in flexible and stretchable devices. Polymer composites such as polydimethylsiloxane (PDMS) can be used, providing a flexibility and a stretchability for BTO-based devices. In this paper, flexible BTO/PDMS composites with a hierarchical microstructure were prepared and their dielectric performance was optimized. The hierarchical microstructure could enhance the mechanical properties, electrical conductivity, and dielectric performance of the composites. This study could provide valuable insights into the design and fabrication of flexible and stretchable electronic devices based on BTO/PDMS composites.
Methods A piece of foam nickel was prepared, cleaned with acetone under ultrasound for 10 min and then washed with deionized water for several times to remove impurities on the surface. An isopropanol was used as a solvent, an appropriate amount of phenolic resin was used as a stabilizer, and an appropriate amount of aluminum nitrate nonahydrate was added to make the BTO positively charged. Little precipitation occurred after mechanical stirring and ultrasonic treatment. A uniform and stable barium titanate suspension was formed. A layer of BTO coating was deposited on the pore walls of the pretreated foam nickel by an electrophoretic deposition (EPD) process. Two copper plates were used as the poles of the electrophoretic deposition. A nickel metal foam template was fixed on a negative pole, immersing it into the EPD tank with the stable BTO suspension To prepare the samples with different BaTiO3 contents, the diameter of the BTO framework pore was controlled via adjusting the electrophoresis time. The sample was sintered in an argon atmosphere at 1 200 ℃ for 2 h, and then immersed in a 1 mol/L FeCl3 solution to completely remove the foam nickel. Finally, the sample was sintered in air at 700 ℃ for 2 h to remove carbon, forming a BTO framework. To determine the mass fraction of BTO, a barium titanate framework was weighed before and after penetration by epoxy resin. The PDMS (with curing agent) was filled into the porous structure and cured at room temperature for 24 h to obtain the BTO/PDMS dielectric composite material.
Results and discussion The results indicate that when the BTO content reaches 10.16% (in mass), the relative permittivity of the composite increases up to 85 at 1 000 Hz (compared to only 2.75 for pristine PDMS). Also, the dielectric permittivity increases as the mass fraction of BTO increases from 5% to 20% (in mass). For the BTO with an ordered morphology, the dielectric permittivity value increases, improving the dielectric strength performance in specific directions. Adding PVDF slightly increases the dielectric permittivity, while reducing the difference between the dielectric properties of filler and substrate, thereby enhancing the dielectric strength performance via combining PVDF with PDMS to form a core-shell structure and optimizing the dielectric properties by a finite element method. The hierarchical microstructure of the composites plays an important role in enhancing the dielectric properties. The uniform distribution of BTO particles and the interconnected porous structure of PDMS matrix provide a continuous path for the movement of charge carriers, which contributes to a high dielectric constant and a low dielectric loss of the composites. In addition, the flexible nature of PDMS matrix also makes the BTO/PDMS composites suitable for various applications, such as flexible electronic devices, sensors, and actuators.
Conclusions The BTO/PDMS flexible dielectric composites with a hierarchical microstructure were prepared by a template method and an electrophoresis deposition method with BTO as a filling material and PDMS as a matrix. The influences of filler morphology and content on the dielectric constant and dielectric strength of the composites were investigated via finite element simulation analysis. Two kinds of ordered network structures of the composites, i.e., tetrahedral network structure and honeycomb network structure, were designed. This provides a theoretical guidance for the preparation of high-quality dielectric composite materials with superior energy storage density. The main conclusions were as follows: (1) Compared to the particle-filled composites, the BTO/PDMS composites with a hierarchical microstructure have an improved dielectric constant at a low filler content. For instance, the relative dielectric constant of the sample with 10.16% BTO could reach 85 at 1 kHz, which was 31 times higher than that of pure PDMS; (2) The morphology of filler had an impact on the dielectric performance of composites. In the case of a low filler content, the composites with a hierarchical microstructure had a higher dielectric constant rather than those with a solid network structure; (3) PVDF was used to form a nuclear shell structure (PVDF@BTO/PDMS) to improve the relative dielectric constant of the composites to a limited extent and the breakdown performance of composites; (4) The orderly network structures were designed. The ordered network structures with a tetrahedral network structure and a honeycomb network structure could improve the dielectric constant of composites to a certain extent and had the anisotropic characteristics.
, authors=Hailong HU, Linghan MENG, Yusuf Abdullahi HASSAN, authorsList=Hailong HU, Linghan MENG, Yusuf Abdullahi HASSAN, authorCompany=null, correspAuthors=null, authorNote=
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介电电容器具有重量轻、充放电速度快、功率密度高等优点，在航空航天储能器件领域的作用日益凸显。采用模板法与电泳沉积法相结合制备了多尺度结构的柔性复合电介质材料钛酸钡/聚二甲基硅氧烷（BTO/PDMS），研究了其微观无序、有序结构对介电性能的影响，并通过理论模拟对其介电与介电强度性能进行了系统分析，为提高复合电介质储能密度的研究提供了理论铺垫。结果表明：当BTO含量达到10.16%（质量分数）时，复合材料的相对介电常数在1 000 Hz时提升到85（纯PDMS的相对介电常数仅为2.75）；当BTO的体积分数在5%~20%之间变化时，介电常数随BTO含量的增加呈线性增加；此外，通过调控BTO形貌的有序定向结构（如四方或蜂窝定向结构），介电性能得到提升，某些特定方向的介电强度性能显著提高；将聚偏氟乙烯（PVDF）和PDMS复合形成核壳结构，常数略有提升，填料与基体的介电性能差异减小，介电强度性能得到提升。
, authors=胡海龙, 孟令晗, 约索夫, authorsList=胡海龙, 孟令晗, 约索夫, authorCompany=null, correspAuthors=null, authorNote=
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HU Hailong (1989-), male, Ph.D., Associate Professor. E-mail: hailonhu@csu.edu.cn
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胡海龙（1989—），男，博士，副教授。
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胡海龙（1989—），男，博士，副教授。
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