Energy-dissipative dual-crosslinked hydrogels for dynamically super-tough sensors  

基于能量耗散型双交联水凝胶的超韧性动态传感器

作　　者：Funian Mo Zifeng Wang Ruijuan Jiang Weiming Gai Qing Li Shuangkun Lv Chunyi Zhi 莫富年;王子峰;姜瑞娟;盖卫明;李清;吕双坤;支春义(Flexible Printed Electronics Technology Center,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong 999077,China;Shenzhen Municipal Engineering Design&Research Institute Co.,Ltd,Shenzhen 518055,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Flexible Printed Electronics Technology Center,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [2]Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong 999077,China [3]Shenzhen Municipal Engineering Design&Research Institute Co.,Ltd,Shenzhen 518055,China [4]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Science China Materials》2021年第11期2764-2776,共13页中国科学（材料科学（英文版）

基　　金：the Science Technology and Innovation Committee of Shenzhen Municipality under Shenzhen Technology Project(JSGG20180508151728414);the Department of Science and Technology of Guangdong Province under Guangdong Science and Technology Project(2018B020208001)。

摘　　要：In the fields of electronic skin and soft wearable sensors,intrinsically stretchable conductors undergo rapid development;however,practical applications of artificial skinlike materials/devices have not been realized because of the difficulty in combining the electromechanical properties and sensing performance.Contrarily,insoluble inorganic conductive domains in the hydrogel matrix are generally incompatible with surrounding elastic networks,decreasing the mechanical strength.Usually,the hydrogels are vulnerable either to severe mechanical stimuli or large deformation,especially when notches are induced.In this study,based on an energy-dissipative dual-crosslinked conductive hydrogel,a mechanically durable and super-tough strain sensor was developed.The highly soft yet dynamically tough hydrogel demonstrated high ionic conductivity(30.2 mS cm^(-1)),ultrastretchability(>600%strain),and superior linear dependence of strain sensitivity with a maximum gauge factor of 1.2 at 500%strain.Because of these advantageous synergistic effects,the resultant hydrogel strain sensor demonstrated reliable and stable detection of a large range of human motion and subtle vibrations.Moreover,it impressively exhibited super toughness that could endure consecutive treading pressure and even retain normal operation after 20 times of car run-over on the road.These demonstrations highly confirm the sensor’s superior mechanical durability and reliability,displaying great potential in developing next-generation mechanically adaptable sensors.本征可拉伸导体在电子皮肤和柔性可穿戴传感器领域中正在快速发展.然而,由于电子-机械性能和传感性能难以完美结合,人造皮肤材料/器件的实际应用尚未实现.一方面是由于传统的水凝胶导体中掺杂的无机导电剂通常与周围的弹性网络不相容,从而导致机械强度降低.另一方面由于水凝胶通常受到严重的机械撞击或较大的变形,特别是当缺口出现时,容易受到损坏.本研究中,我们基于具有耗散能力的双交联导电水凝胶,开发出一种机械强度高且柔韧性好的应变传感器.具有动态韧性的水凝胶导体显示出较高的离子电导率(30.2 mS cm^(-1)),超长的拉伸性(>600%应变)和优异的线性正相关的应变敏感性,在500%应变下其最大应变灵敏因数为1.2.基于这些协同作用,制备的水凝胶应变传感器能够可靠稳定地检测人体的大幅度运动和小幅度动作的微小振动.此外,它还具有超强的柔韧性,可以承受连续的踩踏压力,甚至在道路上被行驶的车辆碾压20次后仍能保持正常运行.这些表征证实了其卓越的机械耐久性和可靠性,在开发下一代实用性传感器方面显示出巨大潜力.

关 键 词：energy-dissipative HYDROGELS SUPER-TOUGH wearable strain sensors 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TQ427.26[自动化与计算机技术—控制科学与工程]