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Soft,body conformable electronics for thermoregulation enabled by kirigami

Bio-Design and Manufacturing 2024年第4期7卷 453-462页

作者： Lung Chow Guangyao Zhao Pengcheng Wu Xingcan Huang Jiyu Li Jian Li Wanying Wang Guihuan Guo Zhiyuan Li Jiachen Wang Jingkun Zhou Yawen Yang Yuyu Gao Binbin Zhang Qiang Zhang Dengfeng Li Ya Huang Kuanming Yao Jian Lu Xinge Yu Department of Biomedical Engineering City University of Hong KongHong Kong 999077China Hong Kong Centre for Cerebro-Cardiovascular Health Engineering Hong Kong 999077China Department of Biomedical Sciences City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China

The application of thermoelectric devices(TEDs)for personalized thermoregulation is attractive for saving energy while balancing the quality of *** that directly attach to human skin remarkably minimized the energy wasted for cooling the entire ***,facing the extreme dynamic geometry change and strain of human skin,conventional TEDs cannot align with the contour of our bodies for the best thermoregulation ***,we designed a kirigami-based wearable TED with excellent water vapor permeability,flexibility,and *** analysis and experimental results reveal that our product can withstand various types of large mechanical deformation without circuit *** stated outcome and proposed facile approach not only reinforce the development of wearable TEDs but also offer an innovative opportunity for different electronics that require high conformability.

关键词： Thermoregulation Thermoelectric kirigami Body conformable Wearable

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Highly stretchable kirigami-patterned nanofiber-based nanogenerators for harvesting human motion energy to power wearable electronics

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Materials Futures 2024年第2期3卷 131-140页

作者： Chuan Ning Shengxin Xiang Xiupeng Sun Xinya Zhao Chuanhui Wei Lele Li Guoqiang Zheng Kai Dong College of Materials Science and Engineering Key Laboratory of Material Processing and Mold(Ministry of Education)Zhengzhou UniversityZhengzhou 450001People’s Republic of China Key Laboratory of Materials Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001People’s Republic of China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400People’s Republic of China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

Wearable electronics are advancing towards miniaturization and ***,traditional energy supply methods have largely hindered their *** effective solution to this problem is to convert human mechanical energy into electricity to power wearable electronic ***,it is greatly attractive to design flexible,foldable and even stretchable energy harvesting ***,we use the electrospinning and kirigami approach to develop a type of highly stretchable kirigami-patterned nanofiber-based triboelectric nanogenerator(K-TENG).Due to its innovative structural design,the K-TENG can achieve a tensile strain of 220%,independent of the tensile properties of the material *** a person swings their arms,the K-TENG fixed to the clothing can convert mechanical energy from human movement into electrical *** produced electricity can directly drive 50 LED lights and a digital watch,or be stored in a lithium battery to charge the smartwatch and smartphone,*** study employs a new method to fabricate a stretchable triboelectric nanogenerator and demonstrates its promising applications in wearable power technology.

关键词： stretchable triboelectric nanogenerators kirigami energy harvesting

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Bioinspired multichannel colorful encryption through kirigami activating grating

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Science Bulletin 2023年第3期68卷 276-283,M0003页

作者： Xiaoyu Hou Florian Vogelbacher Xintao Lai Kaixuan Li Yanlin Song Mingzhu Li Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Materials Processing and Mold of the Ministry of Education Zhengzhou UniversityZhengzhou 450002China

Optical encryption,exploiting degrees of freedom of light as parameters to encode and decode information,plays an indispensable role in our daily *** structural color materials can give real-time visible feedback to external stimuli and provide ideal candidates for optical ***,the development of existing responsive structural color materials is hindered by poor repeatability and long feedback ***,there are only few strategies to exploit structural colors in multichannel information ***,bioinspired by the structural color variation due to a change in angle arising from the movement of animal’s scales or feathers,we developed a general multichannel information encryption strategy using a two-dimensional deformable kirigami arranging orientations of the grating arrays by *** kirigami grating sheet shows rapid,repeatable,and programmable color *** strategy utilizes the topological space deformation to guide the change of optical property,which suggests new possibilities for spatial and spectral encryption as well as mechano-sensing and camouflage.

关键词： Structural color Encryption kirigami Grating Color change

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Controlling the laser induction and cutting process on polyimide films for kirigami-inspired supercapacitor applications

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Science China(Technological Sciences) 2021年第3期64卷 651-661页

作者： WANG WenTao LU LongSheng XIE YingXi WU WeiBin LIANG RongXuan LI ZeHong TANG Yong School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510641China College of Engineering South China Agricultural UniversityGuangzhou 510642China

The recently emerging laser-induced graphene(LIG)technology,with one-step processing and designable features,has been widely used in the fabrication of wearable/portable ***,by taking inspiration from kirigami,we designed a stretchable supercapacitor(SC)step by step through controlling laser induction and cutting process on the polyimide(PI)film,with the use of one single CO_(2) laser ***,the carbonized basic geometric units of lines were produced on PI films to investigate the processing-structure ***,the complex photothermal conversion and heat transfer progress involved in the carbonized process were simulated by a photothermal *** experimental and theoretical results suggested that the laser power,scan rate and focus condition have great influence on the size,shape and morphology of the carbonized ***,we optimized the parameters of laser induction and cutting process to fabricate the kirigami-inspired SCs with reliable electrochemical properties and editable mechanical flexibility,showing great potential in the field of flexible electronics.

关键词： laser-induced grapheme laser cutting photothermal conversion model kirigami supercapacitor

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Multiaxially-stretchable kirigami-patterned mesh design for graphene sensor devices

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Nano Research 2020年第5期13卷 1406-1412页

作者： Hyo Chan Lee Ezekiel YHsieh Keong Yong SungWoo Nam Department of Mechanical Science and Engineering University of Illinois at Urbana–ChampaignUrbanaIllinois 61801USA Department of Materials Science and Engineering University of Illinois at Urbana–ChampaignUrbanaIllinois 61801USA Materials Research Laboratory University of Illinois at Urbana–ChampaignUrbanaIllinois 61801USA Micro and Nanotechnology Laboratory University of Illinois at Urbana–ChampaignUrbanaIllinois 61801USA Carle Illinois College of Medicine University of Illinois at Urbana–ChampaignChampaignIllinois 61820USA

In wearable electronics,significant research has gone into imparting stretchability and flexibility to otherwise rigid electronic components while maintaining their electrical *** far,this has been achieved through various geometric modifications of the rigid conductive components themselves,such as with microcracked,buckled,or planar meander ***,strategic placement of these resulting components within the overall devices,such as embedding them at the neutral plane,has been found to further enhance mechanical stability under ***,these strategies are still limited in performance,failing to achieve fully strain-insensitive electrical performance under biaxial stretching,twisting,and mixed strain ***,we developed a new platform for wearable,motion artifact-free sensors using a graphene-based multiaxially stretchable kirigami-patterned mesh *** normalized resistance change of the electrodes and graphene embedded in the structure is smaller than 0.5%and 0.23%under 180°torsion and 100%biaxial strain,***,the resistance change is limited to 5%under repeated stretching-releasing cycles from 0%to 100%biaxial *** addition,we investigated the deformation mechanisms of the structure with finite element *** on the simulation results,we derived a dimensionless geometric parameter that enables prediction of stretchability of the structure with high ***,as a proof-of-concept,we demonstrated a biaxially-stretchable graphene-based sensor array capable of monitoring of temperature and glucose level with minimized motion-artifacts.

关键词： kirigami mesh strain-insensitive wearable graphene glucose

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kirigami-based highly stretchable perovskite solar cells

Kirigami-based highly stretchable perovskite solar cells

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第七届新型太阳能电池材料科学与技术学术研讨会

作者： Hongjiang Li Weiyan Wang Weijie Song Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences

Exploiting highly stretchable perovskite solar cells(PSCs) offers avenues for self-powered wearable and skin-interfaced electronics ***,realizing stretchable PSCs that can accommodate large strain and feature robust mechanical cyclic stability is still ***,kirigami design was utilized to effectively impart stretchability to PSCs through out-of-plane deformation,which can significantly reduce the strain in the device by 2 orders of magnitude compared with that in the pristine *** virtue of the extremely low strain in the device,the demonstrated kirigami-based PSCs were able to endure various high mechanical deformation,including stretchability(strain up to 200%),twistability(angle up to 450°),and bendability(radius down to 0.5 mm).More impressively,the kirigami PSCs exhibited high mechanical cyclic stability with stable performance after undergoing 1000 repetitive cycles of stretching,twisting,and *** kirigami design provides an appealing route to achieve high deformability for solar cells as well as other optoelectronic devices.

关键词： kirigami stretchable deformability mechanical cyclic stability

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基于kirigami结构的柔性可拉伸天线的研究

基于Kirigami结构的柔性可拉伸天线的研究

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作者：王婷南京邮电大学

学位级别：硕士

近些年来,柔性可拉伸电子设备因其具有体积小、易便携、灵活性好、可拉伸和弯曲等特性而广泛地应用于医疗监护设备、智能可穿戴设备等领域。因此,作为柔性可拉伸电子设备的重要组成部分,柔性可拉伸天线成为新的研究热点。柔性可拉伸天... 详细信息

近些年来,柔性可拉伸电子设备因其具有体积小、易便携、灵活性好、可拉伸和弯曲等特性而广泛地应用于医疗监护设备、智能可穿戴设备等领域。因此,作为柔性可拉伸电子设备的重要组成部分,柔性可拉伸天线成为新的研究热点。柔性可拉伸天线既要实现拉伸、弯曲等形变,还要在形变后仍然保持正常的工作性能。针对这一需求,本文基于剪纸艺术(kirigami)结构设计了四款柔性可拉伸天线。kirigami结构可以使普通的金属面实现拉伸和弯曲且制作方法简单、成本低。本论文的主要工作内容以及研究成果如下:1、本文基于kirigami结构设计了三款柔性可拉伸单极子天线,通过对天线结构的设计实现了单极子天线的拉伸和弯曲。这三款天线分别是弯折结构的柔性可拉伸天线、栅格结构的柔性可拉伸天线以及菱形网格结构的柔性可拉伸天线。其中,弯折结构的柔性可拉伸天线的谐振频率为1.66 GHz,带宽为300 MHz,最大拉伸到40%时,其谐振频点向低频方向偏移6.6%,带宽减少33.3%;栅格结构的柔性可拉伸天线的谐振频率为1.53 GHz,带宽为200 MHz,最大拉伸到40%时,其谐振频点向低频方向偏移6.9%,带宽减少30%;菱形网格结构的柔性可拉伸天线的谐振频率为1.72 GHz,带宽为340 MHz,最大拉伸到30%时,其谐振频点向低频方向偏移9.9%,带宽减少41.2%。实验结果表明:三款基于kirigami结构的柔性可拉伸单极子天线都实现了拉伸和弯曲,在拉伸后其谐振频率向低频段发生偏移,带宽减小,反射系数增加,但在拉伸的过程中天线始终保持正常的工作性能。2、将kirigami结构应用到大面积的接地金属面上以使接地金属面具有拉伸和弯曲的能力,并且通过传输线来验证和研究kirigami结构的接地金属面的工作性能以及拉伸性能。实验结果表明:kirigami结构可以应用到大面积的接地金属面上,但是拉伸之后由于其接地金属面的开口较大导致传输线的性能大幅度下降。在上述实验的基础上设计了一款基于kirigami结构的柔性可拉伸微带贴片天线,将kirigami结构应用到大面积的金属导体面上以实现微带贴片天线的拉伸和弯曲。为了解决接地金属面上的开口问题,采用两层kirigami结构的接地金属面对其结构进行改进。实验结果表明:采用双层接地金属面的柔性可拉伸微带贴片天线实现了10%的拉伸,随着拉伸程度的不断增大,天线的谐振频率、反射系数和带宽都逐渐增加,并且在拉伸的过程中始终保持天线正常的工作性能。

关键词：柔性可拉伸 kirigami 单极子天线微带贴片天线

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用于口颌面部监测的剪纸启发纸基柔性传感器的实验研究

用于口颌面部监测的剪纸启发纸基柔性传感器的实验研究

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作者：王宇睿兰州大学

学位级别：硕士

近年来,随着可穿戴电子学的兴起,可穿戴柔性传感器在个性化医疗、人机交互等领域表现出巨大的潜力,同时也为口腔颌面部肌群实时动态监测以及量化咬合指示带来了新的发展机遇。尽管具有高灵敏度的柔性压阻型传感器被不断报道,然而其复杂... 详细信息

近年来,随着可穿戴电子学的兴起,可穿戴柔性传感器在个性化医疗、人机交互等领域表现出巨大的潜力,同时也为口腔颌面部肌群实时动态监测以及量化咬合指示带来了新的发展机遇。尽管具有高灵敏度的柔性压阻型传感器被不断报道,然而其复杂的微结构构筑过程,微结构易损导致的传感失效、高昂的制备成本以及难以回收或降解带来的环境负担都阻碍了这类传感器在临床中的应用。受传统剪纸艺术启发,将纸基通过激光图案化刻蚀并与石墨烯墨水复合成功制备了具有高灵敏度的柔性压力传感器,具体研究内容如下:研究目的:本文旨在以剪纸艺术为灵感,制备剪纸结构柔性纸基传感器。以期通过剪纸结构提高柔性纸基传感器的性能,在提高灵敏度的同时具备良好的延展性,从而能更好地与皮肤、咬合面共形,扩展其在临床的应用范围。研究方法:1.利用有限元法(Finite Element Method,FEM)工程软件建模并模拟计算,分析不同构型的剪纸结构对纸基传感器件的应变能力及电势场分布的影响,预测用于柔性纸基传感器的最佳剪纸结构设计。2.结合有限元分析(Finite Element Analysis,FEA)结果设计剪纸结构,采用浸渍-冷冻干燥法和激光切割获得了剪纸结构石墨烯/宣纸。以此为基础,通过层层组装的方法制备剪纸结构石墨烯纸基传感器。3.采用原子力显微镜(Atomic Force Microscope,AFM)、扫描电子显微镜(Scanning Electron Microscope,SEM)等手段对剪纸结构石墨烯纸基传感器的微观形貌进行表征。4.通过万能力学实验机、数字万用表等设备构建测试平台,并对剪纸结构石墨烯纸基传感器的应变能力、压力传感能力、相对湿度(Relative Humidity,RH)传感能力、耐久性能进行测试。并结合微观形貌表征结果分析其传感原理。5.将剪纸结构石墨烯纸基传感器贴附于人体不同部位皮肤的表面,以探索该传感器在检测人体生理信号及运动信号监测方面的应用潜力。6.通过在柔性基底上集成剪纸结构石墨烯纸基传感器,制成咬合传感器阵列用于检测牙列咬合高点,以探索其在咬合检测方面的潜力。研究结果:1.不同构型的剪纸结构对纸基传感器的应变能力及电势场分布的有明显影响。在相同拉力下,剪纸结构组较无结构组应变率最高提升至16倍。根据FEA结果优选出了适用于肌肉检测及咬合检查的柔性纸基传感器的最佳剪纸结构。2.根据最佳剪纸结构,成功制备了剪纸结构石墨烯/宣纸,并以此为基础制备了剪纸结构石墨烯纸基传感器。3.通过AFM、SEM等表征手段证明石墨烯/宣纸的成功复合,并对其微观结构进行观察,为后续传感原理分析奠定了基础。4.得益于石墨烯纸基传感器的剪纸结构设计,该传感器具有出色的稳定性(负载-释放循环超过23000次)、高压力灵敏度(在28 Pa压力下灵敏度达到37.61 k Pa)、快速响应(压缩响应时间小于60 ms)等优点,同时还具有线性输出湿度传感功能(R=0.93285)。结合微观形貌表征结果阐释了其传感原理。5.将剪纸结构石墨烯纸基传感器贴附于人体皮肤上,成功监控人体生理信号(如动脉搏动、呼吸),并成功检测人脸表情(如皱眉)和人体关节运动(如肘关节、腕关节、指关节运动及点头运动)。6.成功制备了咬合传感阵列,并在咬合模型上成功完成多个咬合高点的早接触及分布检测。研究结论:剪纸结构的应用能够有效提升纸基传感器的应变能力和灵敏度。本研究所制备的剪纸结构石墨烯纸基传感器能够实现不同人体部位运动的检测及生理信号的监控,具备对康复治疗的病人提供可量化肌肉检测的潜力,且能检测环境相对湿度。基于该传感器的咬合传感阵列应用在咬合模型上成功完成多个咬合高点的空间分布检测。有望为口腔临床咬合检查提供一种新的研究思路和量化检测方法。该传感器的结构设计思路将推动柔性电子设备在智能医学领域的发展,为实现医疗技术的智能化和便携化提供了新的思路和方法。

关键词：传感器石墨烯颌面部 kirigami 复健

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