Flexible pressure-sensitive sensor

Abstract

The invention discloses a flexible pressure-sensitive sensor, which comprises an upper conductive electrode, a sensing medium layer and a lower conductive electrode, wherein the upper conductive electrode and the lower conductive electrode are respectively connected with the upper surface and the lower surface of the sensing medium layer through a first conductive adhesive layer and a second conductive adhesive layer, the sensing medium layer includes a polyurethane foam body and an inductive coating filled in the surface and pores of the polyurethane foam body, the inductive coating is composed by the following components: 100 parts of a silver nanowire aqueous dispersion, 3-5 parts of waterborne acrylic resin, 20-30 parts of ethyl alcohol, 0.4-0.6 part of polyvinylpyrrolidone, 0.2-0.5 part of alkylphenol polyoxyethylene ether, polyethylene glycol p-isooctyl phenyl ether, bismuth isocaprylate and toluene diisocyanate. The flexible pressure-sensitive sensor is flexible, bending-resistant and capable of sensing micro-pressure. Meanwhile, the flexible pressure-sensitive sensor has high sensitivity under high pressure, good in detection accuracy repeatability, and is also convenient for designing devices with various sensitivities and ranges.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a flexible 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 the resistance of the sensitive ele...

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

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