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Gelatin Methacryloyl‐Based Tactile Sensors for Medical Wearables
Author(s) -
Li Zhikang,
Zhang Shiming,
Chen Yihang,
Ling Haonan,
Zhao Libo,
Luo Guoxi,
Wang Xiaochen,
Hartel Martin C.,
Liu Hao,
Xue Yumeng,
Haghniaz Reihaneh,
Lee KangJu,
Sun Wujin,
Kim HanJun,
Lee Junmin,
Zhao Yichao,
Zhao Yepin,
Emaminejad Sam,
Ahadian Samad,
Ashammakhi Nureddin,
Dokmeci Mehmet R.,
Jiang Zhuangde,
Khademhosseini Ali
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202003601
Subject(s) - materials science , biosensor , gelatin , wearable computer , capacitive sensing , dielectric , nanotechnology , pressure sensor , tactile sensor , biomedical engineering , optoelectronics , computer science , mechanical engineering , embedded system , medicine , biochemistry , artificial intelligence , robot , engineering , operating system , chemistry
Gelatin methacryloyl (GelMA) is a widely used hydrogel with skin‐derived gelatin acting as the main constituent. However, GelMA has not been used in the development of wearable biosensors, which are emerging devices that enable personalized healthcare monitoring. This work highlights the potential of GelMA for wearable biosensing applications by demonstrating a fully solution‐processable and transparent capacitive tactile sensor with microstructured GelMA as the core dielectric layer. A robust chemical bonding and a reliable encapsulation approach are introduced to overcome detachment and water‐evaporation issues in hydrogel biosensors. The resultant GelMA tactile sensor shows a high‐pressure sensitivity of 0.19 kPa −1 and one order of magnitude lower limit of detection (0.1 Pa) compared to previous hydrogel pressure sensors owing to its excellent mechanical and electrical properties (dielectric constant). Furthermore, it shows durability up to 3000 test cycles because of tough chemical bonding, and long‐term stability of 3 days due to the inclusion of an encapsulation layer, which prevents water evaporation (80% water content). Successful monitoring of various human physiological and motion signals demonstrates the potential of these GelMA tactile sensors for wearable biosensing applications.