A multifunctional sustainable ionohydrogel with excellent low-hysteresis-driven mechanical performance, environmental tolerance, multimodal stimuli-responsiveness, and power generation ability for wearable electronics

被引:46
作者
Si, Wanjie [1 ,2 ]
Liang, Yingpei [1 ,2 ]
Chen, Yukun [1 ]
Zhang, Shuidong [1 ,2 ,3 ]
机构
[1] South China Univ Technol, Coll Mech & Automot, Guangzhou 510640, Peoples R China
[2] South China Univ Technol, Guangdong Key Lab Tech & Equipment Macromol Adv M, Guangzhou 510640, Peoples R China
[3] South China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510640, Peoples R China
基金
中国国家自然科学基金;
关键词
FACILE PREPARATION; HYDROGEL SENSORS; STRAIN;
D O I
10.1039/d2ta04276b
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The defects of conductive hydrogels, such as high internal friction, poor performance at freezing temperatures, and long-term evaporation during storage, restrict their application in wearable electronics. Herein, a dual-crosslinked starch/PAM/borax/glycerol ionohydrogel is fabricated through a one-pot gelation-assisted polymerization approach. Starch supports PAM adapting to the glycerol/water binary solvent system through hydrogen-bonding interactions and graft copolymerization, while boronic ester linkages serve as cross-linking sites. Interestingly, the ionohydrogel exhibits extremely low internal friction (0.5 kJ m(-3)) and excellent environmental tolerance over a wide temperature range (-60-80 degrees C). Strikingly, the ionization of Na2B4O7 is sensitive to variations in temperature and humidity in a binary solvent system, which also facilitates the ionohydrogel achieving a lower freezing point and higher evaporation temperature. The ionohydrogel achieves appreciable conductivity (21.1 mS m(-1)) and good mechanical properties (tensile strength: 332 kPa; elongation at break: 514%) at -40 degrees C. Taking advantage of these exceptional characteristics and stable transport channels for Na+ and B(OH)(4-), an assembled sensor can effectively detect variations in humidity (20-98%), temperature, and strain with high sensitivity, simulating the sensitivity of human skin. It is noteworthy that a single-electrode TENG manufactured using the ionohydrogel displays excellent energy-harvesting capabilities under different types of deformation. This work provides an effective strategy for obtaining a multifunctional ionohydrogel with high Delta R/R-0 sensitivity for utilization in self-powered wearable electronics under extreme environmental conditions.
引用
收藏
页码:17464 / 17476
页数:13
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