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Non‐oxidized graphene/elastomer composite films for wearable strain and pressure sensors with ultra‐high flexibility and sensitivity
Author(s) -
Meng Qingshi,
Liu Zhiwen,
Cai Rui,
Han Sensen,
Lu Shaowei,
Liu Tianqing
Publication year - 2020
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4760
Subject(s) - materials science , gauge factor , graphene , pressure sensor , fabrication , wearable computer , sensitivity (control systems) , flexibility (engineering) , composite number , elastomer , composite material , durability , wearable technology , strain gauge , piezoresistive effect , response time , strain (injury) , nanotechnology , mechanical engineering , electronic engineering , computer science , medicine , statistics , alternative medicine , mathematics , computer graphics (images) , pathology , engineering , embedded system
It remains challenging to prepare wearable strain and pressure sensors with excellent mechanical properties, ultra‐high flexibility and sensitivity. Electrically conductive graphene platelets (GnPs) with high structural integrity are used in making a composite film fabricated using robust fabrication techniques. The gauge factor for the strain is up to 100 at 0%‐5% strain and 50 at 5%‐30% strain, and the sensitivity to pressure is 2.7×10 ‐2 kPa ‐1 between 0 and 10 kPa and 1.5×10 ‐4 kPa ‐1 between 300 and 1000 kPa. In addition, the flexible sensor demonstrates good repeatability and durability after 1000 cycles of tensile and compression tests. The flexible sensor has fast response ability and a wide operating temperature range, suggesting the excellent response to temperature. The flexible sensor is applied in monitoring several human motions as a wearable device with high accuracy. The ability to detect strain, pressure and temperature of the flexible sensor extends its applications to multifunctional wearable devices.