Journal
CARBOHYDRATE POLYMERS
Volume 211, Issue -, Pages 322-328Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.01.094
Keywords
Ionic hydrogel; Double network; Injectable; High mechanical properties; Flexible sensor; High sensitivity
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Funding
- National Natural Science Foundation of China [51573080, 51873094]
- Key Research and Development Project of Shandong Province [2016GGX102005]
- Technology Development Project of Shinan District of Qingdao [2018-4-007-ZH]
- Program for Taishan Scholar of Shandong Province
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High performance strain sensors have recently attracted immense interest because of their potential applications in wearable devices. However, it remains a challenge in achieving critical feature combinations (e.g., high sensitivity, high mechanical properties, and easy fabrication) for soft wearable sensors. Herein, we fabricated new ionic strain sensors based on agar/NaCl/polyacrylamide double network hydrogels. By taking the advantage of the electric neutrality of agar, we can easily combine the sensitivity and mechanical properties into same ionic hydrogel by tuning the chemical compositions of the hydrogels. Moreover, thanks to the thermoreversible sol-gel properties of agar, the pregel can be injected into various complex shapes. The ionic hydrogels exhibit high strain sensitivity and many superior mechanical properties. The ionic sensor can monitor human motions such as joint motions, slight wrist pulse and subtle muscle movements of throat. Thus, this study demonstrates that the ionic hydrogels have potential applications as high performance strain sensors.
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