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Open AccessArticle

Ultrasensitive Wearable Strain Sensors of 3D Printing Tough and Conductive Hydrogels

1
Key Laboratory of Textile Science & Technology of Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China
2
Department of Mechanical Engineering, California State University Fullerton, Fullerton, CA 92831, USA
3
Department of Mechanical Engineering, Texas Tech University, 2500 Broadway, Lubbock, TX 79409, USA
4
Department of Systems Science and Industrial Engineering, State University of New York at Binghamton, Binghamton, NY 13902, USA
5
Department of Industrial Engineering, Texas Tech University, 2500 Broadway, Lubbock, TX 79409, USA
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(11), 1873; https://doi.org/10.3390/polym11111873
Received: 15 September 2019 / Revised: 11 November 2019 / Accepted: 11 November 2019 / Published: 13 November 2019
In this study, tough and conductive hydrogels were printed by 3D printing method. The combination of thermo-responsive agar and ionic-responsive alginate can highly improve the shape fidelity. With addition of agar, ink viscosity was enhanced, further improving its rheological characteristics for a precise printing. After printing, the printed construct was cured via free radical polymerization, and alginate was crosslinked by calcium ions. Most importantly, with calcium crosslinking of alginate, mechanical properties of 3D printed hydrogels are greatly improved. Furthermore, these 3D printed hydrogels can serve as ionic conductors, because hydrogels contain large amounts of water that dissolve excess calcium ions. A wearable resistive strain sensor that can quickly and precisely detect human motions like finger bending was fabricated by a 3D printed hydrogel film. These results demonstrate that the conductive, transparent, and stretchable hydrogels are promising candidates as soft wearable electronics for healthcare, robotics and entertainment. View Full-Text
Keywords: hydrogels; 3D printing; tough; sensor hydrogels; 3D printing; tough; sensor
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MDPI and ACS Style

Wang, J.; Liu, Y.; Su, S.; Wei, J.; Rahman, S.E.; Ning, F.; Christopher, G.; Cong, W.; Qiu, J. Ultrasensitive Wearable Strain Sensors of 3D Printing Tough and Conductive Hydrogels. Polymers 2019, 11, 1873.

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