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A Strong,Tough,and Self-Healing Strengthening Thioctic Acid-based Elastomer for Highly Reliable flexible strain sensor

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Chinese Journal of Polymer Science 2024年第10期42卷 1610-1618,I0016页

作者： Xin-Yu Chen Yu-Bing Fu Xue-Ling Yan Lan Liu School of Materials Science and Engineering Key Lab of Guangdong Province for High Property and Functional Polymer MaterialsSouth China University of TechnologyGuangzhou510641China

Elastomers with high strength and toughness,excellent self-healing properties,and biocompatibility have broad application prospects in wearable electronics and other fields,but preparing it remains a *** this work,we propose a highly adaptable strategy by introducing the small molecule crosslinking agent of triethanolamine(TEA)to the poly(thioctic acid)(PTA)chains and preparing the PAx Ey elastomers using a simple synthesis *** strategy stabilizes the PTA chains by constructing multiple non-covalent cross-linked dynamic networks,endowing materials with excellent strength and toughness(tensile strength of 288 kPa,toughness of 278.2 kJ/m3),admirable self-healing properties(self-healing efficiency of 121.6%within 7 h at 70℃),and good *** PAx Ey elastomers can also be combined with MWNTs to become flexible strain sensors,which can be used to monitor human joint movements with high sensitivity,repeatable responses,and stability.

关键词： Thioctic acid Ion clusters Multiple dynamic networks Self-healing strengthening flexible strain sensor

Highly sensitive flexible strain sensor based on microstructured biphasic hydrogels for human motion monitoring

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Frontiers of Materials Science 2023年第4期17卷 55-64页

作者： Xin Gao Xinyu Wang Xingce Fan Key Laboratory of Quantum Materials and Devices of Ministry of Education School of PhysicsSoutheast UniversityNanjing 211189China School of Chemistry and Chemical Engineering Southeast UniversityNanjing 211189China

flexible strain sensors have been extensively used in human motion detection,medical aids,electronic skins,and other civilian or military *** strain sensors made of metal or semiconductor materials suffer from insufficient stretchability and sensitivity,imposing severe constraints on their utilization in wearable ***,we design a flexible strain sensor based on biphasic hydrogel via an in-situ polymerization method,which possesses superior electrical response and mechanical *** stress could prompt the formation of conductive microchannels within the biphasic hydrogel,which originates from the interaction between the conductive water phase and the insulating oil *** device performance could be optimized by carefully regulating the volume ratio of the oil/water ***,the flexible strain sensor with oil phase ratio of 80%demonstrates the best sensitivity with gauge factor of 33 upon a compressive strain range of 10%,remarkable electrical stability of 100 cycles,and rapid resistance response of 190 ***,the human motions could be monitored by this flexible strain sensor,thereby highlighting its potential for seamless integration into wearable devices.

关键词： flexible strain sensor biphasic hydrogel conductive hydrogel human motion monitoring

An Ultrasensitive, Durable and Stretchable strain sensor with Crack-wrinkle Structure for Human Motion Monitoring

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Chinese Journal of Polymer Science 2021年第3期39卷 316-326,I0005页

作者： Ze-Yu Li Wei Zhai Yun-Fei Yu Guo-Jie Li Peng-Fei Zhan Jian-Wei Xu Guo-Qiang Zheng Kun Dai Chun-Tai Liu Chang-Yu Shen Shen Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationSchool of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

flexible strain sensor has promising features in successful application of health monitoring, electronic skins and smart robotics, ***, we report an ultrasensitive strain sensor with a novel crack-wrinkle structure(CWS) based on graphite nanoplates(GNPs)/thermoplastic urethane(TPU)/polydimethylsiloxane(PDMS) nanocomposite. The CWS is constructed by pressing and dragging GNP layer on TPU substrate,followed by encapsulating with PDMS as a protective layer. On the basis of the area statistics, the ratio of the crack and wrinkle structures accounts for 31.8% and 9.5%, respectively. When the sensor is stretched, the cracks fracture, the wrinkles could reduce the unrecoverable destruction of cracks, resulting in an excellent recoverability and stability. Based on introduction of the designed CWS in the sensor, the hysteresis effect is limited effectively. The CWS sensor possesses a satisfactory sensitivity(GF=750 under 24% strain), an ultralow detectable limit(strain=0.1%) and a short respond time of 90 ms. For the sensing service behaviors, the CWS sensor exhibits an ultrahigh durability(high stability>2×10^(4) stretching-releasing cycles). The excellent practicality of CWS sensor is demonstrated through various human motion tests,including vigorous exercises of various joint bending, and subtle motions of phonation, facial movements and wrist pulse. The present CWS sensor shows great developing potential in the field of cost-effective, portable and high-performance electronic skins.

关键词： Polymer nanocomposites Microstructure flexible strain sensor Human motion monitoring

A low-cost, printable, and stretchable strain sensor based on highly conductive elastic composites with tunable sensitivity for human motion monitoring

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Nano Research 2018年第4期11卷 1938-1955页

作者： Yougen Hu Tao Zhao Pengli Zhu Yuan Zhang Xianwen Liang Rong Sun Ching-Ping Wong Guangdong Provincial Key Laboratory of Materials for High Density Electronic Packaging Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China Nano Science and Technology Institute University of Science and Technology of China Suzhou 215123 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA Department of Electronic Engineering The Chinese University ofHong Kong Hong Kong 999077 China

strain sensors with high stretchability, broad strain range, high sensitivity, and good reliability are desirable, owing to their promising applications in electronic skins and human motion monitoring systems. In this paper, we report a high- performance strain sensor based on printable and stretchable electrically con- ductive elastic composites. This strain sensor is fabricated by mixing silver-coated polystyrene spheres （PS@Ag） and liquid polydimethylsiloxane （PDMS） and screen-printed to a desirable geometry. The strain sensor exhibits fascinating comprehensive performances, including high electrical conductivity （1.65 × 104 S/m）, large workable strain range （〉 80%）, high sensitivity （gauge factor of 17.5 in strain of 0%-10%, 6.0 in strain of 10%-60% and 78.6 in strain of 60%-80%）, inconspicuous resistance overshoot （〈 15%）, good reproducibility and excellent long-term stability （1,750 h at 85℃/85% relative humidity） for PS@Ag/PDMS-60, which only contains - 36.7 wt.% of silver. Simultaneously, this strain sensor provides the advantages of low-cost, simple, and large-area scalable fabrication, as well as robust mechanical properties and versatility in applications. Based on these performance characteristics, its applications in flexible printed electrodes and monitoring vigorous human motions are demonstrated, revealing its tremendous potential for applications in flexible and wearable electronics.

关键词： flexible strain sensor printable electronics human motion monitoring conductive elastic composites silver-coated polymer spheres

High performance strain sensor based on leather activated by micro-cracking conductive layer

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Collagen and Leather 2023年第4期5卷 76-87页

作者： Jianzhong Ma Zhijie Cheng Sha Tan Tian Zheng Yan Zong College of Bioresources Chemical and Materials Engineering Shaanxi University of Science and TechnologyXi'an 710021China Xi'an Key Laboratory of Green Chemicals and Functional Materials Xi'an 710021China Materials Characterization and Fabrication Platform Department of Chemical EngineeringUniversity of MelbourneParkvilleMelbourne 3010Australia

flexible strain sensors are capable to detect external force induced strain change owing to their unique ability to convert deformation into electrical ***,micro/nano patterning of conductive layer in strain sensor is an effective method to improve its sensitivity,however the sophisticated manipulation process is limited only in laboratory *** this report,a simple and scalable fabrication strategy was used to create micro-cracking conductive layer as an alternative patterning method to achieve high performance of strain *** details,the sensor was fabricated using leather as the substrate to filtrated acidified multi-walled carbon nanotubes(a-MWCNTs)/layered double hydroxides(LDHs)*** stretching process,micro-cracking structure emerged on the percolated a-MWCNTs/LDHs layer,causing a rise up of resistance according to increasing strain and generated a detectable electrical *** prepared sensor had a large detecting range(60%),high sensitivity(GF of 7238.92 at strain 30-60%),fast response(tensile response time of 270 ms),good stability and *** sensor also inherited the advantages of leather,such as biodegradability and good air permeability,and the introduction of a-MWCNTs/LDHs further enhanced its fire retardancy *** features ensured the sensor as an eco-friendly,comfortable and safe electronic device for human motion detection.

关键词： a-MWCNTs LDHs Leather flexible strain sensor

Stress-deconcentrated ultrasensitive strain sensor with hydrogen-bonding-tuned fracture resilience for robust biomechanical monitoring

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Science China Materials 2022年第8期65卷 2289-2297页

作者： Yizhuo Yang Wenjie Tang Jinyi Wang Ruiqing Liu Ping Yang Shisheng Chen Yuehui Yuan Jingfeng Xu Xueyang Ren Shancheng Yu Hao Wu Yunfan Zhou Leili Zhai Xiaodong Shao Zenan Chen Benhui Hu School of Biomedical Engineering and Informatics Nanjing Medical UniversityNanjing 211166China Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical SchoolNanjing 210008China School of Materials and Engineering Nanjing Institute of TechnologyNanjing 211167China The Affiliated Eye Hospital of Nanjing Medical University Nanjing 210029China Jiangsu Key Laboratory of Xenotransplantation Nanjing Medical UniversityNanjing 211166China

Recently,rapid advances in flexible strain sensors have broadened their application scenario in monitoring of various mechanophysiological *** various strain sensors,the crack-based strain sensors have drawn increasing attention in monitoring subtle mechanical deformation due to their high ***,early generation and rapid propagation of cracks in the conductive sensing layer result in a narrow working range,limiting their application in monitoring large biomechanical ***,we developed a stress-deconcentrated ultrasensitive strain(SDUS)sensor with ultrahigh sensitivity(gauge factor up to2.3×10^(6))and a wide working range(0%-50%)via incorporating notch-insensitive elastic substrate and microcrack-tunable conductive ***,the highly elastic amine-based polymer-modified polydimethylsiloxane substrate without obvious hysteresis endows our SDUS sensor with a rapid response time(2.33 ms)to external *** accurate detection of the radial pulse,joint motion,and vocal cord vibration proves the capability of SDUS sensor for healthcare monitoring and human-machine communications.

关键词： flexible strain sensor microcrack mechanophysiological signal monitoring ultrahigh sensitivity wide working range

Micromesh reinforced strain sensor with high stretchability and stability for full-range and periodic human motions monitoring

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InfoMat 2024年第4期6卷 124-139页

作者： Haidong Liu Chang Liu Jinan Luo Hao Tang Yuanfang Li Houfang Liu Jingzhi Wu Fei Han Zhiyuan Liu Jianhe Guo Rongwei Tan Tian-Ling Ren Yancong Qiao Jianhua Zhou School of Biomedical Engineering Shenzhen Campus of Sun Yat-sen UniversityShenzhenGuangdongthe People's Republic of China Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province School of Biomedical EngineeringSun Yat-sen UniversityGuangzhouthe People's Republic of China School of Integrated Circuits and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijingthe People's Republic of China CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences(CAS)Shenzhenthe People's Republic of China Guangdong Engineering Technology Research Center of Implantable Medical Polymer Shenzhen Lando Biomaterials Co.Ltd.Shenzhenthe People's Republic of China

The development of strain sensors with high stretchability and stability is an inevitable requirement for achieving full-range and long-term use of wearable electronic ***,a resistive micromesh reinforced strain sensor(MRSS)with high stretchability and stability is prepared,consisting of a laser-scribed graphene(LSG)layer and two styrene-block-poly(ethylene-ran-butylene)-block-poly-styrene micromesh layers embedded in *** micromesh reinforced structure endows the MRSS with combined characteris-tics of a high stretchability(120%),excellent stability(with a repetition error of 0.8%after 11000 cycles),and outstanding sensitivity(gauge factor up to 2692 beyond 100%).Impressively,the MRSS can still be used continauously within the working range without damage,even if stretched to 300%.Furthermore,compared with different structure sensors,the mechanism of the MRSS with high stretchability and stability is ***'s more,a multilayer finite element model,based on the layered structure of the LSG and the morphology of the cracks,is proposed to investigate the strain sensing behavior and failure mechanism of the ***,due to the outstanding performance,the MRSS not only performes well in monitoring full-range human motions,but also achieves intelligent recognitions of various respiratory activities and ges-tures assisted by neural network algorithms(the accuracy up to 94.29%and 100%,respectively).This work provides a new approach for designing high-performance resistive strain sensors and shows great potential in full-range and long-term intelligent health management and human-machine interac-tions applications.

关键词： flexible strain sensor excellent stretchability and stability layered laser-scribed graphene micromesh reinforced structure multilayer finite element model

Wearable ultrasensitive and rapid human physiological monitoring based on microfiber Sagnac interferometer

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Science China(Information Sciences) 2024年第3期67卷 281-290页

作者： Xin WANG Hongyou ZHOU Meihua CHEN Yongcheng HE Zhishen ZHANG Jiulin GAN Zhongmin YANG State Key Laboratory Luminescent Materials and Devices Institute of Optical Communication MaterialsSpecial Glass Fiber and Device Engineering Technology Research and Development Center of Guangdong ProvinceGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of Technology Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology Foshan University

High-sensitive and fast-responding flexible strain sensors are essential for the smart wearable devices that precisely and dynamically perceive the weak deformations induced by human physiological signals. Here, a flexible strain sensor via polydimethylsiloxane(PDMS)-encapsulated microfiber Sagnac interferometer was designed and prepared for monitoring the human pulse signals and sound vibrations. The sensor achieved a record-breaking sensitivity(gauge factor, GF = 9977) and an extremely low detection limit(0.00025%) due to the strong polarization-dependent coupling effect in the microfiber coupler and the polarization-mixing effect in the Sagnac loop. The relative intensity demodulation method also enabled a fast response time of 10 μs. The wearable pulse measurements were implemented by attaching this flexible strain sensor directly to human skin at various locations and the waveform details were accurately captured. Taking advantage of the ultra-high sensitivity and fast response performance of the prepared sensor, the real-time dynamic acquisition of the underwater weak signal, such as the hydro-acoustic waves with a wide range of 20 Hz–16.86 k Hz, has been demonstrated. These initial results pave the way for a new and innovative category of underwater wearable devices with rapid detection of human physiological signals and weak environmental vibrations.

关键词： flexible strain sensor microfiber Sagnac interferometer underwater detection

Highly sensitive and dynamically stable strain sensors based on porous-designed Fe nanowires/multi-walled carbon nanotubes with stable bi-conducting networks

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Science China(Technological Sciences) 2022年第12期65卷 2990-2999页

作者： YANG PingAn LIU ZhongBang LUO JiuFei LI Rui LU Yi HUANG Xin ZHANG Qiang ZHOU ZhiHao School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Advanced Manufacturing Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China College of Engineering and Technology Zunyi Normal CollegeZunyi 563006China

flexible sensors for high strain sensitivity and dynamic stability are important for the development of human-interactive and health-monitoring ***,establishing a stable conductive network with low-conductivity material filling that can resist tensile strain failure and achieve high device performance still faces significant ***,a highly stretchable and sensitive strain sensor with strong dynamic stability and low conductive materials filling was fabricated based on highly conductive multi-walled carbon nanotubes(MWCNTs)and Fe nanowires(NWs)to construct a porous-designed bi-conducting network using a salt sacrificial template *** porous-designed Fe NW/MWCNT strain sensor(PFMS)with low material filling(3.6 wt.%Fe NWs and 10.6 wt.%MWCNTs)showed high sensitivity with a gauge factor(GF)of 134.98(strain range 0–22%)and 569.37(strain range 22%–60%),which is much higher compared with the pure MWCNT strain sensor with a GF of *** is attributed to the significant change in the contact area and contact resistance of the Fe NW/MWCNT bi-conducting network during tensile *** addition,the PFMS exhibited high repetitive stability over 2000 stretching-releasing *** attached to the human body,the PFMS functions as a health-monitoring device,that can accurately distinguish human motions such as the bending of fingers,knees,and ***,the proposed strategy pens a novel avenue for constructing porous conductive networks using polymer composites and is highly competitive for developing high-performance strain sensors.

关键词： flexible strain sensor multi-walled carbon nanotubes Fe nanowires porous structure