Research On Tactile Sensors Based On Highly Flexible And Elastic Porous Materials

Three-dimensional porous conductive material is a combination of excellent electrical characteristics and mechanical flexibility of the new material. The direct infiltration method based on porous material as template has the advantages of simple process and low cost,which is a promising method for preparing three-dimensional porous conductive material. It is of practical significance to study the tactile sensor based on three-dimensional porous conductive material to develop new tactile sensor and broaden its application field.In this paper, through dip-coating processes, we fabricated PUS- CB / GNPs / SR and PDA-PUS-CB / GNPs / SR composites with dual network structure by using polymer sponge as the template with carbon black and graphene nanosheets conductive filler, Two kinds of methods including blend coating method and layer by layer method assembly method were used to fabricate those composites, and the porous composite materials were analyzed by scanning electron microscopy and fourier transform infrared spectroscopy. The influence of the size of the template structure on the mechanical properties was studied. The effects of two-phase packing,three-dimensional sponge skeleton, modification and preparation method on the electrical and mechanical properties of the porous elastomer were also investigated. And the process parameters of high performance porous conductive sponge composites were optimized.A small-scale tactile sensor with high sensitivity and high flexibility based on PDA-PUS-CB / GNPs / SR conductive sponge was designed and fabricated. The anti-jamming effect of the tactile sensor based on three-dimensional conductive sponge on the temperature and humidity in the environment was studied. Using signal acquisition and processing system, the sensor was integrated in the throat, back of the hand,knuckle to achieve a small tactile perception(<2kPa). The results show that the sensor can be widely used in electronic skin and wearable devices, which has great potential applications in the future...