Preparation And Performance Study Of Ion Gel Wearable Flexible Pressure Senso

In recent years,with the rapid development of wearable electronic devices,flexible pressure sensors have been widely studied and further developed in the fields of human-computer interaction,electronic skin,human health detection,real-time motion monitoring and biological medicine.The growth of flexible sensors has always been challenging since the sensing behavior,mechanic performance and fatigue resistance remain to be improved.In this paper,wearable pressure sensors with fast response and high sensitivity based on ionogel were fabricated.The ionogel is a double-network（DN）structure composed of polydimethylacrylamide（PDMAAm）skeleton and silica particles,carrying ionic liquids（ILs）,which serves as a piezoresistive device.Four sorts of high performance piezoresistive sensors were fabricated through composite design and architecture construction based on the ionogel.i)By impregnating and polymerization with the ionogel-prepolymer solution,a conventional cotton knitted fabric is converted into a conductive and piezoresistive composite.The fabric serves as a ductile supporting matrix for the ionogel,supplementing the piezoresistive contribution of the brittle silica network.This ionogel/textile composite has a high sensitivity(S=86.90 k Pa^-1)and durability,continuously outputting stable electric signal during monitoring the motion states of different joints in human body.ii)Nanocellulose（NC）was induced to prepare the NC-ionogel,which strongly improved the sensitivity and applied pressure of the sensor.The NC-ionogel can work effectively to record the movement of human joints.iii)Multi-linear ionogel unidirectional alignment and longitude-latitude interleaving alignment were constructed to fabricate the sensing device with high sensitivity performance.The resulted sensors can work well without interdigital electrodes to express the gestures and following the wellness status of human being,including heat-beat,arterial fluctuation as well as joint movements.iv)Ionogel with the pyramidal array architecture was prepared and then assembled into opposite bilayers.This architecture of ionogel shows an excellent behavior in monitoring the physiological signal of human.These ionogel-based device provides a potential formula of wearable sensors,stepping toward the burgeoning diversified-technologies assisted intelligence system,including wellness assessment,rehabilitation treatment evaluation,real-time motion tracking,feature informantion recognition,interface of human-machine interaction and artifical intelligence system.