Preparation process of high-sensitivity pressure sensitive sensor

Abstract

The invention discloses a flexible pressure sensitive sensor. The sensor comprises an upper conductive electrode, a sensing medium layer and a lower conductive electrode. The sensing medium layer is obtained through the following steps that: a silver nanowire aqueous dispersion, waterborne acrylic resin, ethanol, polyvinylpyrrolidone, alkylphenol ethoxylate, polyethylene glycol 4-isooctyl phenyl ether, bismuth octoate and toluene diisocyanate are mixed, and an obtained mixture is subjected to ultrasonic dispersion, so that a mixed liquid can be obtained; the mixed liquid is injected into a polyurethane foam body, and the polyurethane foam body injected with the mixed liquid is immersed in the mixed liquid; the polyurethane foam body which has been subjected to the treatment of the second step is repeatedly pressed; the polyurethane foam body immersed with the mixed liquid which has been subjected to the treatment of the third step is placed in a baking oven so as to be dried. The flexible pressure sensitive sensor of the invention can be bent, is bend-resistant and can sense small pressure; the flexible pressure sensitive sensor has high sensitivity under high pressure; the flexible pressure sensitive sensor can be conveniently applied to the design of devices with various sensitivities and ranges; the comprehensive precision of the flexible pressure sensitive sensor is smallerthan 0.2% FS; and the reliability of the flexible pressure sensitive sensor is high.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a preparation process for a high-sensitivity pressure-sensitive sensor. Background technique [0002] Pressure sensors can be divided into piezoelectric sensors based on piezoelectric materials and piezoresistive sensors based on piezoresistive materials according to materials. Piezoelectric sensors made of piezoelectric ceramics, piezoelectric crystals, piezoelectric electrets, and organic piezoelectric films as sensitive elements generate transferable charges on the surface of the material when they are under pressure, and the voltage when the charges pass through the detection device Can directly reflect the size of the pressure. The piezoresistive sensor with alloy sensitive gate, semiconductor and other materials as sensitive elements deforms when it is under pressure, and the deformation causes the resistance of the sensitive element to change. By detecting the change in t...

AI Technical Summary

Problems solved by technology

[0003] Existing pressure sensors are often not resistant to bending, and the sensitivity is not enough. The error of measuring pressure with the sensor of pressure-sensitive material will reach about 20%, and the measurement accuracy is poor. How to overcome the above technical problems and improve them has become an effort for those skilled in the art. direction

Images