Freezing-Tolerant, Highly Sensitive Strain and Pressure Sensors Assembled from Ionic Conductive Hydrogels with Dynamic Cross-Links

Liu，Hongyan1; Wang，Xing2; Cao，Yanxia1; Yang，Yanyu1; Yang，Yatian1; Gao，Yafei1; Ma，Zhanshan1; Wang，Jianfeng1; Wang，Wanjie1; Wu，Decheng2,3

2020

10.1021/acsami.0c06067

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

1944-8252

Conductive hydrogels have attracted intensive attention for versatile functions in flexible electronics because of their unique combination of mechanical flexibility and conductivity. However, hydrogels containing plenty of water inevitably freeze at subzero temperature, leading to invalid electronics with failed mechanical advantages and negligible conductivity. Moreover, the inferior elasticity and fatigue resistance of hydrogels result in unstable sensing performance and poor reusability of hydrogel-based electronics. Herein, a freezing-tolerant, high-sensitive, durable strain and pressure sensor was constructed from an ionic conductive chitosan-poly(acrylamide-co-acrylic acid) double-network [CS-P(AM-co-AA) DN] hydrogel with dual-dynamic cross-links (chitosan physical network and ionic coordination [COLFe]), which was feasibly fabricated by soaking the CS-P(AM-co-AA) composite hydrogel in FeCl solution. The ions immobilized in dynamic cross-links exerted crucial effects on improving mechanics [prominent tensile performance, supercompressibility, extraordinary elasticity, fast self-recovery capacity, and remarkable fatigue resistance (1000 cycles)]; meanwhile, the free ions in the hydrogel rendered the hydrogel excellent conductivity and strong freezing tolerance concurrently. The sensor assembled from the DN hydrogel exhibited cycling stability and good durability in detecting pressure, various deformations (elongation, compression, and bend), and human motions even at a low temperature (-20 °C). Notably, the sensitivity on detecting strain and pressure at both room and subzero temperature was superior than most of the reported organohydrogel and hydrogel sensors. Thus, we believe that this work will provide a platform for construction and application of high-sensitive strain and pressure hydrogel sensors with cycling stability and good durability in a wide temperature range.

conductive hydrogel cycling stability flexible wearable sensor freezing resistance high sensitivity

SCI ; EI

英语

ESI高被引

其他

WOS:000538515700085

20202308783923

Dynamics ; Flexible electronics ; Temperature ; Iron compounds ; Reusability ; Chlorine compounds ; Durability ; Elasticity ; Wearable sensors ; Amides ; Cost effectiveness ; Freezing

Thermodynamics:641.1 ; Electronic Equipment, General Purpose and Industrial:715 ; Colloid Chemistry:801.3 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Industrial Economics:911.2

2-s2.0-85085707027

Scopus

1.College of Materials Science and Engineering,Zhengzhou University,Zhengzhou, Henan,450001,China
2.Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing,100190,China
3.Department of Biomedical Engineering,Southern University of Science and Technology,Shenzhen, Guangdong,518055,China

Liu，Hongyan,Wang，Xing,Cao，Yanxia,et al. Freezing-Tolerant, Highly Sensitive Strain and Pressure Sensors Assembled from Ionic Conductive Hydrogels with Dynamic Cross-Links[J]. ACS Applied Materials & Interfaces,2020,12:25334-25344.

Liu，Hongyan.,Wang，Xing.,Cao，Yanxia.,Yang，Yanyu.,Yang，Yatian.,...&Wu，Decheng.(2020).Freezing-Tolerant, Highly Sensitive Strain and Pressure Sensors Assembled from Ionic Conductive Hydrogels with Dynamic Cross-Links.ACS Applied Materials & Interfaces,12,25334-25344.

Liu，Hongyan,et al."Freezing-Tolerant, Highly Sensitive Strain and Pressure Sensors Assembled from Ionic Conductive Hydrogels with Dynamic Cross-Links".ACS Applied Materials & Interfaces 12(2020):25334-25344.