Preparation And Research Of Stretchable Strain Sensor Based On Friction-Transfer Method

With the rapid progress of society and technology,stretchable strain sensors that can detect and monitor human motion have attracted enormous attention in the field.This paper investigated low-cost graphite-VHB strain sensors prepared by simple friction-transfer method.Representation of microstructure of the conductive path is conducted.Designed by friction-transfer method,the graphite-VHB strain sensor possesses good stretchability,light weight and high sensitivity.The addition of protection layer and pre-aging process have contributions to expand the GF of the sensor.by attaching our strain sensor to the sample of mechanical arm,the resistance change of the sensor perfectly fitted to the deformation of the arm,which shows its good sensitivity and responsibility.In order to realize the tunable properties of strain sensor,we further introduce a novel mechanical structure design to control the performance of the strain sensor.the performance of the device can be simply controlled by the structure design rather than complex materials adjustments.So the complexity of the material preparation will be greatly reduced,thus promotes the materials translation and production.By designing an asymmetric structure of elastomer substrate and protect layer with different adjustable parameters,the stain distribution in elastomer can be controlled,which finally the stretchability and sensitivity of the strain sensors.application tests on human body including subtle-scale strain like pulse and large-strain like elbow bending are conducted to prove our capability for multi-scale motion detecting.Finally,the graphite-VHB strain sensor prepared in the paper possesses outstanding stretchability,sensitivity and good responsibility,repeatability,durability.Tunable performance of strain sensor is realized by adding macro-structure mechanical design.Performance of strain sensor tested in different application tests shows its potential in wearable electronics,robot skin and human-machine interaction.