Journal
CHEMICAL ENGINEERING JOURNAL
Volume 370, Issue -, Pages 1039-1047Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.03.287
Keywords
Organohydrogel; Sulfonated lignin; Solvent replacement; Antifreezing; Strain sensor
Categories
Funding
- National Natural Science Foundation of China - Fujian Education Department for the Excellent Talents Support Plan in Fujian Universities [31770632]
- School Outstanding Youth Fund from Fujian Agriculture and Forestry [XJQ201506]
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Gel-based strain sensors have great potential in the fields of motion detection and real-time healthcare. Nevertheless, the relatively low strain sensitivity and inferior anti-freezing property limit the utilization of these sensors. In this work, a novel multifunctional organohydrogel sensor was developed based on a poly (acrylic acid) (PAA) skeleton with poly (3,4-ethylenedioxythiophene): sulfonated lignin (PEDOT:SL) as the conducive material and a water/glycerol binary solvent as the dispersion medium. The conducive, self-wrinkled, soft and elastic properties endue the organohydrogel sensor with a superior gauge factor (GF) of up to 7 (strain: 100%), while the freezing tolerance of the water/glycerol solvent endows the organohydrogel with an excellent antifreezing property. The organohydrogel sensor senses not only the movement of limbs, but also a weak pulse and throat vibrations. Moreover, physiological signals such as those used for electrocardiography (ECG) and electromyography (EMG) can be readily detected. In addition, the cell culture test shows that the organohydrogel is nontoxic, and the animal experiments demonstrate that the organohydrogel can protect skin from frostbite. Overall, this work presents a new concept to use lignin for conducive PEDOT polymerization and integrates the fabrication of conducive organohydrogel materials for precise strain sensing.
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