Flexible high-performance microcapacitors enabled by all-printed two-dimensional nanosheets  

全二维材料印刷基柔性高性能微型电容器

作　　者：Pengxiang Zhang Yushui Fu Xin Zhang Xihua Zhang Bao-Wen Li Ce-Wen Nan 张鹏翔;付玉水;张鑫;张希华;李宝文;南策文(Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education),Shandong University,Jinan 250061,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Center of Smart Materials and Devices,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Silicate Materials for Architectures,School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education),Shandong University,Jinan 250061,China [2]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Center of Smart Materials and Devices,Wuhan University of Technology,Wuhan 430070,China [3]State Key Laboratory of Silicate Materials for Architectures,School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China [4]State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Science Bulletin》2022年第24期2541-2549,M0004,共10页科学通报（英文版）

基　　金：supported by the Basic Science Center Program of National Natural Science Foundation of China(51788104);the National Natural Science Foundation of China(52172124 and51872214);the Fundamental Research Funds for the Central Universities(WUT:2021III019JC,2018III041GX)。

摘　　要：Chemically exfoliated nanosheets have exhibited great potential for applications in various electronic devices.Solution-based processing strategies such as inkjet printing provide a low-cost,environmentally friendly,and scalable route for the fabrication of flexible devices based on functional inks of twodimensional nanosheets.In this study,chemically exfoliated high-k perovskite nanosheets(i.e.,Ca_(2)Nb_(3)O_(10)and Ca_(2)NaNb_(4)O_(13))are well dispersed in appropriate solvents to prepare printable inks,and then,a series of microcapacitors with Ag and graphene electrodes are printed.The resulting microcapacitors,Ag/Ca_(2)Nb_(3)O_(10)/Ag,graphene/Ca_(2)Nb_(3)O_(10)/graphene,and graphene/Ca_(2)NaNb_(4)O_(13)/graphene,demonstrate high capacitance densities of 20,80,and 150 nF/cm^(2) and high dielectric constants of 26,110.and 200,respectively.Such dielectric enhancement in the microcapacitors with graphene electrodes is possibly attributed to the dielectric/graphene interface.In addition,these microcapacitors also exhibit good insulating performance with a moderate electrical breakdown strength of approximately 1 MV/cm,excellent flexibility,and thermal stability up to 200℃.This work demonstrates the potential of high-k perovskite nanosheets for additive manufacturing of flexible high-performance dielectric capacitors.化学剥离的纳米片展现了在各类电子元器件中巨大的应用潜力.包括喷墨印刷在内的溶液加工手段为制备二维材料柔性器件提供了一种低成本、环境友好且可拓展的路径.本文将化学剥离的Ca_(2)Nb_(3)O_(10)和Ca_(2)NaNb_(4)O_(13))钙钛矿纳米片均匀分散在适当的溶剂中,制备了可印刷油墨,并打印出一系列基于银和石墨烯电极的微电容器.例如,银/Ca_(2)Nb_(3)O_(10)/银、石墨烯/Ca_(2)Nb_(3)O_(10)/石墨烯和石墨烯/Ca_(2)NaNb_(4)O_(13))/石墨烯微电容器分别具有20,80和150 nF/cm^(2)高电容密度和26,110和200的高介电常数.其中,基于石墨烯电极的微电容器展现出明显的介电增强现象,这可能归因于电介质层与石墨烯电极层之间的界面效应.此外,这类微电容器还具有良好的绝缘性,约1 MV/cm的中等耐击穿强度,优异的柔性及耐200℃的热稳定性.本工作展示了高k钙钛矿纳米片在增材制造柔性高性能电介质电容器方面的潜力.

关 键 词：High-k perovskite nanosheets Inkjet printing Microcapacitors Dielectric enhancement Interface effect 

分 类 号：TM53[电气工程—电器] TB383.1[一般工业技术—材料科学与工程]