Research progress of intelligent wearable flexible pressure sensor

Abstract

Flexible pressure sensors can be attached to the human skin to sense external pressure signals， and have the characteristics of wide sensing range， short response time， high sensitivity， and durability. Therefore， they are widely used in the fields of electronic skin and human-computer interaction. Flexible pressure sensors are usually composed of flexible substrates， active materials and conductive electrodes. Among them， one or more of the active materials form a sensing material by compounding with a flexible substrate， and its deformation under external excitation will cause changes in parameters such as resistance， thereby achieving sensing function.In addition， by introducing microstructure， the compressibility and sensitivity to small pressure of the sensing material can be increased， and its sensing performance can be improved. In this paper， the research progress in flexible pressure sensors doped with carbon-based， metal-based， and black phosphorus-based active materials on film and fabric substrates was reviewed. The preparation methods， electromechanical properties and application scenarios of different sensors were discussed， and the advantages and disadvantages of various sensors were summarized. On this basis， the research on how to achieve wide-range pressure detection， commercialization， non-toxicity of the production process and long-term biocompatibility experiments of smart wearable flexible pressure sensors in the future is prospected.