期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 42, 页码 14029-14039出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c03068
关键词
Waterborne polyurethane; Carbon nanotubes; Graphene; Piezoresistive sensor; Cellulose nanocrystal; Composite aerogel
资金
- Sichuan Science and Technology Program [2021YFG0249]
- Sichuan University [2019CDYB-29]
- Yibin City [2019CDYB-29]
- National Natural Science Foundation of China
- Civil Aviation Administration of China [U1833118]
A flexible piezoresistive sensor with high sensitivity, low cost, and wide response range was developed using a composite aerogel. The sensor demonstrated remarkable mechanical properties, high sensitivity, low detection limit, and stability. It could successfully detect various human motions and extract real-time information, while also exhibiting excellent thermal insulation for potential use in high-temperature environments.
Flexible piezoresistive sensors with high sensitivity, low cost, and wide response ranges are urgently required due to the rapid development of wearable electronics. Here, carbon nanotubes (CNTs)/graphene/waterborne polyurethane (WPU)/cellulose nanocrystal (CNC) composite aerogels (CNTs/graphene/WC) were fabricated by facile solution mixing and freeze-drying technology for high-performance pressure sensors. WPU and CNC were constructed as a 3D structure skeleton, and the synergistic effect of CNTs and graphene was beneficial to enhancing the sensing performance. The obtained pressure sensor exhibits a highly porous network structure, remarkable mechanical properties (76.16 kPa), high sensitivity (0.25 kPa(-1)), an ultralow detection limit (0.112 kPa), and high stability (>800 cycles). More importantly, the piezoresistive sensor could be successfully used to detect various human motions such as finger bending, squatting-rising, walking, and running and effectively extract real-time information by the electrical signals. In addition, the CNTs/graphene/WC composite aerogel exhibits excellent thermal insulation performance, which can withstand 160 degrees C for a long time without any damage to the structure. The CNTs/graphene/WC composite aerogel, because of its thermal insulation property, endows the sensor with the potential for application in hightemperature environments. The results indicate that CNTs/graphene/WC composite aerogels possess high sensing performance and outstanding thermal insulation, which means that the aerogels could be used as flexible, wearable electronics.
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