Tough, Antifreezing, and Piezoelectric Organohydrogel as a Flexible Wearable Sensor for Human-Machine Interaction

被引:20
|
作者
Shi, Yongdong [1 ]
Guan, Youjun [1 ]
Liu, Mingjie [1 ]
Kang, Xinchang [1 ]
Tian, Yu [1 ]
Deng, Weicheng [1 ]
Yu, Peng [2 ,3 ]
Ning, Chengyun [2 ,3 ]
Zhou, Lei [4 ]
Fu, Rumin [2 ,3 ]
Tan, Guoxin [1 ]
机构
[1] Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou 510006, Peoples R China
[2] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China
[3] South China Univ Technol, Natl Engn Res Ctr Tissue Restorat & Reconstruct, Guangzhou 510641, Peoples R China
[4] Guangzhou Med Univ, Affiliated Hosp 3, Guangzhou Key Lab Spine Dis Prevent & Treatment, Dept Spine Surg, Guangzhou 510150, Peoples R China
基金
中国国家自然科学基金;
关键词
organohydrogel; piezoelectricpolymer; low-temperaturetolerance; wearable sensor; human-machineinteraction; DIPOLE; CRYSTALLINE; GENERATION; STABILITY; PHASES;
D O I
10.1021/acsnano.3c11578
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Piezoelectric hydrogel sensors are becoming increasingly popular for wearable sensing applications due to their high sensitivity, self-powered performance, and simple preparation process. However, conventional piezoelectric hydrogels lack antifreezing properties and are thus confronted with the liability of rupture in low temperatures owing to the use of water as the dispersion medium. Herein, a kind of piezoelectric organohydrogel that integrates piezoelectricity, low-temperature tolerance, mechanical robustness, and stable electrical performance is reported by using poly-(vinylidene fluoride) (PVDF), acrylonitrile (AN), acrylamide (AAm), p-styrenesulfonate (NaSS), glycerol, and zinc chloride. In detail, the dipolar interaction of the PVDF chain with the PAN chain facilitates the crystal phase transition of PVDF from the alpha to beta phase, which endows the organohydrogels with a high piezoelectric constant d (33) of 35 pC/N. In addition, the organohydrogels are highly ductile and can withstand significant tensile and compressive forces through the synergy of the dipolar interaction and amide hydrogen bonding. Besides, by incorporating glycerol and zinc chloride, the growth of ice crystals is inhibited, allowing the organohydrogels to maintain stable flexibility and sensitivity even at -20 C-degrees. The real-time monitoring of the pulse signal for up to 2 min indicates that the gel sensor has stable sensitivity. It is believed that our organohydrogels will have good prospects in future wearable electronics.
引用
收藏
页码:3720 / 3732
页数:13
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