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Significant strain-rate dependence of sensing behavior in Ti0_(2)@carbon fibre/PDMS composites for flexible strain sensors

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Journal of Advanced Ceramics 2021年第6期10卷 1350-1359页

作者： Fan ZHANG Hailong HU Simin HU Jianling YUE School of Minerals Processing and Bioengineering Central South UniversilyChangsha 410083China School of Aeronautics&Astronautics Central South UniversityChangsha 410083China Research Center in Intelligent Thermal Structures for Aerospace Central South UniversityChangsha 410083China

Carbon fibre(CF)embedded into elastomeric media has been attracting incredible interest as flexible strain sensors in the application of skin electronics owing to their high sensitivity in a very small strain *** further improve the sensitivity of CF/PDMS composite strain sensor,the relatively low temperature prepared TiO_(2) nanowire via hydrothermal route was employed herein to functionalize *** results showed a significant increase in the sensitivity of the TiO_(2)@CF/PDMS composite strain sensors which was reflected by the calculated gauge *** the prepared TiO_(2) nanowire vertically embraced the surroundings of the CF,the introduced TiO_(2) nanowire contributed to a highly porous structure which played a predominant role in improving the sensitivity of strain ***,the significant strain rate dependent behavior of TiO_(2)@CF/PDMS strain sensor was revealed when performing monotonic tests at varied strain ***,introducing TiO_(2) nanowire on CF offers a new technique for fabricating flexible strain sensors with improved sensitivity for the application of flexible electronics.

关键词： composites dependence of strain rate sensitivity flexible strain sensors

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Superstretchable and multifunctional ionogel for facile fabricating flexible strain sensors

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Resources Chemicals and Materials 2023年第4期2卷 312-320页

作者： Fengjun Fang Chuang Jiang Chenxi Ning Wei Liu Qingxi Hou Yonghao Ni Tianjin Key Laboratory of Pulp&Paper Tianjin University of Science&TechnologyTianjin 300457China Department of Chemical Engineering University of New BrunswickFrederictonNew BrunswickE3B 5A3Canada

With the rapid development of“Internet of Things”and human-computer interaction techniques,it is essential and urgent to develop facile and scalable fabrication platforms for stretchable flexible ***,we report a facile strategy of using the green choline chloride-acrylamide deep eutectic solvent(CC-AM DES)to guide the in-situ ring-opening polymerization ofα-lipoic acid(LA),leading to the successful development of a stretchable ionogel *** as-prepared ionogel from CC-AM DES system exhibits multifunctional merits including the super stretchability(>9000%),100%UV-blocking ability,tunable adhesiveness(29-414 kPa),high ionic conductivity(4.45×10^(-4) S/cm),and ideal anti-freezing(-27℃).In addition,this outstanding ionogel can be readily coated on various material substrates with designable shapes and *** to these promising properties and performances,a scalable flexible strain sensor is assembled from the ionogel and exhibits stable resistance variations(R/R_(0))towards multiple external mechanical *** study provides a green,cost effective,and scalable strategy to fabricate ionogel materials and multifunctional flexible strain sensors,showing a great potential in the fast-emerging highly stretchable wearable/flexible electronics.

关键词： Deep eutectic solvents α-lipoic acid Ionogel Ring-opening polymerization flexible strain sensors

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Effects of temperature on MWCNTs/PDMS composites based flexible strain sensors

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Journal of Central South University 2020年第11期27卷 3202-3212页

作者： GUO Deng-ji PAN Xu-dong HE Hu State Key Laboratory of High Performance Complex Manufacturing School of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China

Conductive polymer composites(CPCs)are widely used in the flexible strain sensors due to their simple fabrication process and controllable sensing ***,temperature has a significance impact on the strain sensing performance of *** this paper,the strain sensing characteristics of MWCNTs/PDMS composites under temperature loading were systematically *** was found that the sensitivity decreased with the increase of temperature and the phenomenon of shoulder peak also *** on the theory of polymer mechanics,it was found that temperature could affect the conductive network by changing the motion degree of PDMS molecular chain,resulting in the change of sensing ***,a mathematical model of the resistance against loading condition(strain and temperature),associated with the force−electrical equivalent relationship of composites,was established to discuss the experimental results as well as the sensing *** results presented in this paper was believed helpful for the further application of strain sensors in different temperature conditions.

关键词： flexible strain sensors conductive polymer composites temperature multi-walled carbon nanotubes(MWCNTs)

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Construction of laser-induced graphene/silver nanowire composite structures for low-strain,high-sensitivity flexible wearable strain sensors

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Science China(Technological Sciences) 2024年第11期67卷 3524-3534页

作者： YANG PingAn ZHAO JingYuan LI Rui ZHOU ZhiHao GUI YinGang SUN RuiXue WU DeCheng WANG XiaoJie School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China College of Engineering and Technology Southwest UniversityChongqing 400715China Bio-inspired Robotics and Intelligent Material Laboratory Institute of Advanced Manufacturing TechnologyHefei Institutes of Physical ScienceChinese Academy of SciencesChangzhou 213164China

Sandwich-structured flexible sensors based on graphene have high sensitivity and *** graphene is combined with a flexible substrate in a sandwich structure,the weak bonding between them compromises the sensor's stability and sensitivity at low *** presents challenges in monitoring subtle physiological activities,such as hand bending and pulse *** this purpose,laser-induced graphene(LIG)is proposed to be used to prepare flexible sensors in order to improve the sensitivity and stability of the sensors at low ***(PDMS)with low modulus and polyimide(PI)with rich carbon content are selected as precursor materials for LIG,and graphene is formed through laser ***,silver nanowires(Ag NWs)solution is added to LIG to give the sensor low strain and high sensitivity *** the PI/PDMS ratio is 1:3,the Ag NWs/LIG flexible strain sensor exhibits excellent sensitivity(GF=778.468)over a small strain range(8.76%-11.25%).Meanwhile,the sensor still shows excellent stability after 2000 cycle *** Ag NWs/LIG flexible strain sensor shows good performance when placed on the back of the hand,around the eyes,*** is demonstrated that Ag NWs/LIG flexible strain sensors have good application potential in human physiological activity monitoring,health management and medical fields,and provide a low-strain,high-sensitivity sensor design strategy for flexible wearable devices.

关键词： flexible strain sensors high sensitivity strain range Ag NWs laser-induced graphene

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