A flexible strain sensor based on laser direct writing grapefruit peel and its preparation method

Abstract

The invention is a flexible strain sensor based on laser direct writing on pomelo peel and a preparation method thereof. The sensor includes a flexible substrate, a flexible protective layer, a carbonized material film, and a pair of electrodes. The manufacturing steps are: laser direct writing on the outer surface of grapefruit peel to form a carbonized material film, using adhesive tape to adhere and tear off the carbonized material film; The precursor is coated on the side of the adhesive tape where the carbonized material film is adhered, and the flexible substrate precursor is cured to form a flexible substrate; the tape is peeled off to leave the carbonized material film on the flexible substrate; a carbonized material film is formed at both ends of the carbonized material film. For the electrode, the flexible protective layer precursor is coated on the flexible substrate in such a way that the carbonized material film and the electrode are interposed, and the flexible protective layer precursor is cured to form a flexible protective layer. The method of the invention is simple in process, low in cost and friendly to the environment, and the flexible sensor has high sensitivity, wide monitoring range and stability, and can be applied in the fields of medical health, intelligent artificial limbs, human-computer interaction and the like.

Description

technical field [0001] The invention belongs to the field of strain sensors, and in particular relates to a method for preparing a high-sensitivity strain sensor by irradiating laser light on the outer surface of pomelo peel to form a carbonized material film, and the strain sensor prepared by the method. Background technique [0002] A strain sensor is a sensor based on measuring the strain generated by the deformation of an object under the action of force. It can convert the mechanical deformation information of the measured object into electrical signals according to certain rules, for example, the resistance value of the sensor changes correspondingly with the change of strain, and is used to accurately measure the deformation characteristics of the object. Traditional strain sensors are used in machinery, automobiles, aerospace, petroleum, shipbuilding and other fields, among which resistance strain gauges are most commonly used. It is a sensing element that can conve...

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Problems solved by technology

It guarantees the sensitivity and stability of the sensor by ensuring that the geometric parameters of the structural layer and the crack structure of the sensitive layer are controllable, but the traditional photolithography technology has the disadvantage of long development time, and it is difficult to realize large-scale industrial production.

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