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Rapid self-healing,self-adhesive,anti-freezing,moisturizing,antibacterial and multi-stimuli-responsive PVA/starch/tea polyphenol-based composite conductive organohydrogel as flexible strain sensor

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Journal of Materials Science & Technology 2023年第4期135卷 199-212页

作者： Tao Ke Li Zhao Xin Fan Haibin Gu Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065China National Engineering Research Center of Clean Technology in Leather Industry Sichuan UniversityChengdu 610065China

The complexity of application environment stimulates the development of wearable devices based on functional hydrogels.Among all the promising performances,self-healing and self-adhesion properties are ideal for hydrogel sensors,which can guarantee good accuracy,comfort and long service life.However,it is still a challenge to achieve simultaneous self-healing and self-adhesion in different environments(in the air,underwater and at low temperatures).Herein,a feasible new strategy was successfully carried out to prepare a starch-based composite conductive organohydrogel based on the reversible borate ester bonds formed by complexing starch/polyvinyl alcohol(PVA)/tea polyphenol(TP)with borax,and multiple hydrogen-bond interactions among PVA,starch,TP and ethylene glycol(EG).Silver nanoparticles(Ag-NPs),reduced and stabilized by TP,and MWCNTs(multi-walled carbon nanotubes)were introduced into the cross-linking networks to endow the resulting PBSTCE organohydrogel with considerable antibacterial property and conductivity,respectively.The organohydrogel possessed rapid self-healing(HE(self-healing efficiency)=96.07%in 90 s,both in the air and underwater,also at-20℃),considerable self-adhesion(both in the air and underwater,also at-20℃),remarkable stretchability(814%of elongation),anti-freezing(-20℃)and moisture-retention abilities,antibacterial activity,sensitive pH/sugar-responsiveness,and plasticity.The strain sensor formed by the PBSTCE organohydrogel can not only effectively record large-scale human motions(e.***.finger/wrist/elbow bending,walking,etc.),but also accurately capture subtle motion changes(e.***.breathing,chewing,swallowing,speaking,smiling and frowning).Moreover,the self-healed organohydrogel sensor also exhibited almost invariable mechanical,electrical and sensing behaviors.This work demonstrates a feasible strategy to construct multifunctional starch-based organohy-drogels,and promotes their efficient,stable and eco-friendly application as flexible wearable devices.

关键词： Conductive organohydrogel strain sensor Self-healing Self-adhesive Anti-freezing Antibacterial

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Scorpion-inspired dual-bionic,microcrack-assisted wrinkle based laser induced graphene-silver strain sensor with high sensitivity and broad working range for wireless health monitoring system

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Nano Research 2023年第1期16卷 1228-1241页

作者： Wentao Wang Longsheng Lu Xiaoyu Lu Zhanbo Liang Honghao Lin Zehong Li Xiaohua Wu Lihui Lin Yingxi Xie School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510641China

Scorpions,through ruthless survival of the fittest,evolve the unique ability to quickly locate and hunt prey with slit receptors near the leg joints and a sharp sting on the multi-freedom tail.Inspired by this fantastic creature,we herein report a dual-bionic strategy to fabricate microcrack-assisted wrinkle strain sensor with both high sensitivity and stretchability.Specifically,laserinduced graphene(LIG)is transferred from polyimide film to Ecoflex and then coated with silver paste using the casting-andpeeling and prestretch-and-release methods.The shape-adaptive and long-range ordered geometry(e.g.,amplitude and wavelength)of dual-bionic structure is prestrain-tuned to optimize the superfast response time(~76 ms),high sensitivity(gauge factor=223.6),broad working range(70%–100%),and good reliability(>800 cycles)of scorpion-inspired strain sensor,outperforming many LIG-based materials and other bionic sensors.The alternate reconnect/disconnect behaviors of slit-organlike microcracks in the mechanical weak areas initiate tremendous resistance changes,whereas the scorpion-tail-like wrinkles act as a“bridge”connecting the adjacent LIG resistor units,enabling reversible resilience and unimpeded electrical linkages over a wide strain range.Combined with the self-developed miniaturized,flexible,and all-in-one wireless transmission system,a variety of scenarios such as large body movements,tiny pulse,and heartbeat are real-time monitored via bluetooth and displayed in the client-sides,revealing a huge promise in future wearable electronics.

关键词： laser-induced graphene strain sensor scorpion dual-bionic microcrack-assisted wrinkle health monitoring system

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A Multi-model,Large-range Flexible strain sensor Based on Carbonized Silk Habotai for Human Health Monitoring

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Chinese Journal of Polymer Science 2023年第8期41卷 1238-1249,I0008页

作者： Shi-Dong Ma Yu-Ting Wu Jian Tang Yu-Min Zhang Tao Yan Zhi-Juan Pan College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123China National Engineering Laboratory for Modern Silk Suzhou 215123China

In recent years,flexible strain sensors have received considerable attention owing to their excellent flexibility and multifunctionality.However,it is still a great challenge for them to accurately monitor multi-model deformations with high sensitivity and linearity.In this study,the industrial insulating silk habotai was successfully converted into carbonized silk habotai(CSH)for use in strain sensors.A strain sensor created using CSH exhibited excellent sensing performance under multi-model deformations,including stretching,twist and bending.The maximum tensile strain was 434%.The gauge factors were 14.6 in the wide tensile range of 0%–400%with a high linearity of 0.959.In addition,the CSH strain sensor exhibited an extremely fast response time(110 ms)and could accurately detect bending(0°–180°)and torsional(0°–180°)strains.High durability and repeatability were observed for the multi-model strains.Finally,a new type of smart pillow was developed to accurately record head movement and breathing during sleep.The sensor may also be used for auxiliary training in table tennis.The proposed CSH strain sensor has shown great potential for applications in smart devices and human-machine interactions.

关键词： Carbonized silk habotai strain sensor Smart pillow Human motions

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A stretchable fabric as strain sensor integrating electromagnetic shielding and electrochemical energy storage

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Nano Research 2023年第11期16卷 12753-12761页

作者： Xu Li Xiaohui Sun Jiuyue Zhang Song Xue Linjie Zhi Advanced Chemical Engineering and Energy Materials Research Center China University of Petroleum(East China)Qingdao 266580China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China College of New Energy China University of Petroleum(East China)Qingdao 266580China

Multifunctional intelligent fabric plays an integral role in health management,human–machine interaction,wireless energy storage and conversion,and many other artificial intelligence fields.Herein,we demonstrate a newly developed MXene/polyaniline(PANI)multifunctional fabric integrated with strain sensing,electrochemical energy storage,and electromagnetic shielding properties.The multifunctional fabric-based strain sensor possesses a real-time signal response at a sizeable tensile strain of 100%with a minute strain of 0.5%,maintaining a stable and consistent signal response even after 3000 stretch–release cycles.In addition,the multifunctional fabric exhibits excellent electromagnetic shielding capabilities,achieving a total shielding effectiveness value of up to 43 dB,and in the meantime shows attractive electrochemical energy storage performance as an electrode in a supercapacitor,offering a maximum specific capacity and energy density of 522.5 mF·cm^(−2)and 18.16μWh·cm^(−2),respectively.Such a multifunctional intelligent fabric offers versatile opportunities to develop smart clothes for various artificial intelligent applications.

关键词： strain sensor MXene polyaniline(PANI) multifunctional intelligent fabric electromagnetic interference(EMI)shielding electrochemical energy storage

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Highly sensitive and stretchable piezoelectric strain sensor enabled wearable devices for real-time monitoring of respiratory and heartbeat simultaneously

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Nanotechnology and Precision Engineering 2022年第1期5卷 12-23页

作者： Zhenjie Ji Menglun Zhang State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China

The World Health Organization has declared COVID-19 a pandemic.The demand for devices or systems to diagnose and track COVID-19 infections noninvasively not only in hospitals but also in home settings has led to increased interest in consumer-grade wearables.A common symptom of COVID-19 is dyspnea,which may manifest as an increase in respiratory and heart rates.In this paper,a novel piezoelectric strain sensor is presented for real-time monitoring of respiratory and heartbeat signals.A highly sensitive and stretchable piezoelectric strain sensor is fabricated using a piezoelectric film with a serpentine layout.The thickness of the patterned PVDF flexible piezoelectric strain sensor is only 168μm,and the voltage sensitivity reaches 0.97 mV/με.The effective modulus is 13.5 MPa,which allows the device to fit to the skin and detect the small strain exhibited by the human body.Chest vibrations are captured by the piezoelectric sensor,which produces an electrical output voltage signal conformally mapped with respiratory–cardiac activities.The separate heart activity and respiratory signals are extracted from the mixed respiratory–cardiac signal by an empirical mode decomposition data processing algorithm.By detecting vital signals such as respiratory and heart rates,the proposed device can aid early diagnosis and monitoring of respiratory diseases such as COVID-19.

关键词： Physiological signal strain sensor High sensitivity Flexibility Early diagnosis COVID-19

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Cephalopods-inspired Repairable MWCNTs/PDMS Conductive Elastomers for Sensitive strain sensor

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Chinese Journal of Polymer Science 2022年第4期40卷 384-393页

作者： Kaiming Zhang Zhe Wang Yuetao Liu Haoyu Zhao Chuanhui Gao Yumin Wu State Key Laboratory Base for Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials(Ministry of Education) Shandong UniversityJinan 250100China

Flexible electronic devices based on reversible bonds for self-curing capabilities arouses extensive interest.However,most of the composite conductive elastomers have the problems of poor mechanical properties and slow recovery of mechanical properties during multiple stretching,which hinder their stability in continuous operation.In this study,hyperbranched-MWCNTs/hyperbranched-PDMS self-healable conductive elastomers inspired by cephalopods were successfully developed.The prepared conductive elastomer exhibited good self-healing ability(91%)at room temperature excited by multiple reversible interactions.The prepared elastomer showed outstanding mechanical properties and anti-fatigue ability,so that it can cope with more arduous tasks.Moreover,the elastomer was sensitive to the change of stress states and can be used as a stable strain sensor.Therefore,the self-repairing conductive elastomer has potential practicability in the fields of human-computer interaction,motion monitoring,soft robot and so on.

关键词： Self-healable Reversible interactions Hyperbranched Anti-fatigue strain sensor

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Multifunctional hydrophobic fabric-based strain sensor for human motion detection and personal thermal management

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Journal of Materials Science & Technology 2023年第7期138卷 108-116页

作者： Tianxue Zhu Lexin Liu Jianying Huang Shuhui Li Yonggang Lei Weilong Cai Yuekun Lai Huaqiong Li College of Chemical Engineering Fuzhou UniversityFuzhou 350116China Zhejiang Engineering Research Center for Tissue Repair Materials Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325000China Department of Chemistry University College LondonLondon WC1E 6BTUK Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou 325000China

Multifunctional flexible devices for human motion detection and thermal management raised great at-tention as the problem of the aging population is becoming more and more serious.However,it is still a challenge to endow the devices with excellent stability and wide application scope.Here we prepared a hydrophobic and conductive fabric-based strain sensor for smart fabric via successively coating with poly-dopamine(PDA),polyaniline(PANI),polypyrrole(PPy),and polydimethylsiloxane(PDMS)through in-situ polymerization and dip-coating,which could be used for strain sensor and wearable heater both in air and underwater.The obtained sample exhibited a fast electrical response in 500 ms and could withstand 10,000 times stretching-releasing cycles,additionally,the sample exhibited satisfactory electro-thermal and photo-thermal performances.As a whole,the multifunctional fabric-based devices with excellent performances show great potential to be applied in medical monitoring and personal care,especially for aged and disabled persons.

关键词： strain sensor Superhydrophobic Thermal management Photo-thermal device

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High-performance fiber strain sensor of carbon nanotube/thermoplastic polyurethane@styrene butadiene styrene with a double percolated structure

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Frontiers of Materials Science 2022年第1期16卷 99-110页

作者： Dong XIANG Libing LIU Xiaoyu CHEN Yuanpeng WU Menghan WANG Jie ZHANG Chunxia ZHAO Hui LI Zhenyu LI Ping WANG Yuntao LI School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Chongqing UniversityChongqing 400030China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China The Center of Functional Materials for Working Fluids of Oil and Gas Field Southwest Petroleum UniversityChengdu 610500China

In this work,a high-performance fiber strain sensor is fabricated by constructing a double percolated structure,consisting of carbon nanotube(CNT)/thermoplastic polyurethane(TPU)continuous phase and styrene butadiene styrene(SBS)phase,incompatible with TPU(CNT/TPU@SBS).Compared with other similar fiber strain sensor systems without double percolated structure,the CNT/TPU@SBS sensor achieves a lower percolation threshold(0.38 wt.%)and higher electrical conductivity.The conductivity of 1%-CNT/TPU@SBS(4.12×10^(-3) S·m^(-1))is two orders of magnitude higher than that of 1%-CNT/TPU(3.17×10^(-5) S·m^(-1))at the same CNT loading of 1 wt.%.Due to double percolated structure,the 1%-CNT/TPU@SBS sensor exhibits a wide strain detection range(0.2%-100%)and an ultra-high sensitivity(maximum gauge factor(GF)is 32411 at 100%strain).Besides,the 1%-CNT/TPU@SBS sensor shows a high linearity(R^(2)=0.97)at 0%-20%strain,relatively fast response time(214 ms),and stability(500 loading/unloading cycles).The designed sensor can efficiently monitor physiological signals and movements and identify load distribution after being woven into a sensor array,showing broad application prospects in wearable electronics.

关键词： double percolated structure strain sensor fiber carbon nanotube nanocomposite

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Calibration Technology of Optical Fiber strain sensor

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Journal of Shanghai Jiaotong university(Science) 2023年第5期28卷 551-559页

作者：陈刚刘宏月高瑞翔 Shanghai Institute of Quality Inspection and Technical Research Shanghai 200031China School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China

As one of the hotspots of sensing technology at present, optical fiber sensor has the characteristics of small size, anti-electromagnetic interference, and easy networking, which plays an irreplaceable role in multiphysics parameter monitoring of complex electromagnetic environments. The precise calibration of the optical fiber strain sensor has great practical value in prolonging the survival rate of the sensor, improving the measurement accuracy, and meeting the needs of long-term monitoring. By reviewing the research status of strain sensor calibration method and fiber optic strain sensor calibration method, the advantages and disadvantages of the main methods are analyzed separately from the static and dynamic perspectives, and the development prospect of the calibration technology of optic fiber strain sensor is summarized.

关键词： optic fiber strain sensor static calibration dynamic calibration

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Ultrastable Viologen Ionic Liquids-Based Ionogels for Visible strain sensor Integrated with Electrochromism,Electrofluorochromism,and strain Sensing

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CCS Chemistry 2023年第8期5卷 1917-1930页

作者： Yueyan Zhang Mengying Guo Guoping Li Xiaoliang Chen Zishun Liu Jinyou Shao YongAn Huang Gang He Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an 710054 Micro-/Nano-technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an 710054 International Center for Applied Mechanics State Key Laboratory for Strength and Vibration of Mechanical StructuresXi’an Jiaotong UniversityXi’an 710049 State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074

Flexible electronics play a key role in the development of human society and our daily activities.Currently they are expected to revolutionize personal health management.However,it remains challenging to fabricate smart sensors with high robustness,reliability,and visible readout.Herein,high-performance electrochromic(EC),electro-fluorochromic(EFC),and double-network ionogels with excellent transmissivity,high mechanical robustness,and ultrastable reversibility are prepared by combination of thienoviologen-containing ionic liquids with poly(ethyl acrylate)elastomer.The ionogels exhibit good mechanical properties(1000%stretchability and 3.2 kJ m^(−2) fracture energy).The ionogel-based EC devices have a significantly simplified device fabrication process as well as superior cycling stability in which 88%of the contract ratio is maintained at 88%at 500 cycles,even after being stored for 2 years under ambient atmosphere(relative humidity:30%∼40%,25°C).The conductivity of ionogels showed a fast and reproducible response to strain,and the conductivity decreased with increased strain.By virtue of the EC and EFC properties of the thienoviologen component,the EC and EFC efficiency decreased with the increased strain loaded on the ionogels,and almost no EC or EFC phenomena were observed when the strain was above 300%.This feasible strategy provides an opportunity for the development of visible strain sensors to monitor the body’s movements through color and fluorescence emission.

关键词： ionogels flexible electronics viologen electrochromism strain sensor

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