Self-Healing and Highly Stretchable Gelatin Hydrogel for Self-Powered Strain Sensor.

Published on Jan 8, 2020in ACS Applied Materials & Interfaces8.758
· DOI :10.1021/ACSAMI.9B18646
Jie Wang21
Estimated H-index: 21
(USTB: University of Science and Technology Beijing),
Fu Tang15
Estimated H-index: 15
(USTB: University of Science and Technology Beijing)
+ 3 AuthorsLidong Li32
Estimated H-index: 32
(USTB: University of Science and Technology Beijing)
Hydrogels that electronically respond to mechanical changes can be used as strain sensors. However, these systems usually require external power to convert changes in strain into electrical signals. Here, a self-powered strain sensor is developed based on a gelatin-based hydrogel and a galvanic cell. In the hydrogel matrix, hydrophobic interactions and hydrogen bonding between tannic acid and gelatin give the prepared hydrogel great potential for elongation (1600%). The hydrogel also has a rapid self-healing ability (within 1s) and high self-healing efficiency (95%). The hydrogel operates as an efficient electrolyte material and forms a hydrogel battery when assembled with a thin layer of zinc and an air electrode. This device had excellent tolerance to large compressional strain without sacrificing open circuit voltage. On the basis of this hydrogel battery, we fabricated a self-powered strain sensor by connecting the hydrogel battery to a fixed resistor to form a closed loop. By converting its chemical ...
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