[ACS Applied Materials & Interfaces]Capacitive Pressure Sensors Containing Reliefs on Solution-Processable Hydrogel Electrodes
作者：ongwei Zhou,* Mingcheng Wang, Xilang Jin, Hanbin Liu, Jialiang Lai, Haotian Du, Weixing Chen,* Aijie
關鍵字：pressure sensor, hydrogel, high sensitivity, relief, polyaniline, PVA
論文來源：期刊
具體來源：ACS Applied Materials & Interfaces
發表時間：2021年
Highly sensitive capacitive-type pressure sensor has been achieved by fabricating reliefs on solution-processable hydrogel electrodes. Hybrid PVA/PANI hydrogels (PVA, poly-(vinyl alcohol); PANI, polyaniline) with a fully physically crosslinked binary network are selected as the electrodes of the pressure sensors. On the basis of the solution processability, reliefs are fabricated on the surface of PVA/PANI hydrogel electrodes by a template method. The gauge factor (GF) is enhanced by introducing reliefs and regulated by controlling the composition and relief dimension of hydrogel electrodes. The optimized pressure sensor containing reliefs achieves the highest GF of 7.70 kPa?1 and a sensing range of 0?7.4 kPa. Furthermore, the freezing and drying problems of the hydrogel sensors are overcome by introducing a binary solvent of water/glycerol and the pressure sensing ability at ?18 °C has been achieved. Finally, monitoring of various pressures in daily life, such as joint bending, blowing, and brush writing, is demonstrated using such pressure sensors.