Flexible stress sensor and preparation method thereof

Abstract

The invention discloses a flexible stress sensor. The flexible stress sensor comprises a strain sensing layer, an electrode and a flexible packaging layer, wherein the strain sensing layer is electrically connected with the electrode; the flexible packaging layer wraps the strain sensing layer and the electrode; the electrode comprises silver paste and a wire; one end of the wire is adhered to thestrain sensing layer through the silver paste; and the other end of the wire is led to the outside of the flexible packaging layer. A preparation method of the flexible stress sensor comprises the following steps: coating a lower flexible polymer substrate with graphene ink, and naturally air-drying the graphene ink to form a graphene film; coating the two ends of the graphene film with the silver paste respectively, adhering one end of the wire to the silver paste coated at one end of the graphene film, and leading the other end of the wire to the outside of the flexible packaging layer; andperforming insulated packaging on the naturally air-dried graphene film and the electrode by the flexible polymer substrate. The flexible stress sensor is low in cost, simple and feasible, high in durability and suitable for large-scale production regardless of size.

Description

Technical field[0001]The invention belongs to the field of sensors, and specifically relates to a flexible stress sensor and a preparation method thereof.Background technique[0002]In recent years, with the continuous development of flexible wearable electronics, flexible stress sensors have been effectively developed as the basic detection unit of flexible wearable devices. The flexible stress sensor has the characteristics of large measurable strain range, high sensitivity, stability, and convenient processing. However, there is a contradiction between the measurable strain range and sensitivity. When the measurable strain range of the sensor is large enough, its response sensitivity to small stress is often not good; and when the sensitivity of the sensor is high, it is often greater than 30%. Under strain, the measurable range of the sensor is exceeded. Therefore, how to solve the contradiction between the measurable strain range and the sensitivity, and achieve a wide strain ran...

AI Technical Summary

Problems solved by technology

However, there is a contradiction between the measurable strain range and sensitivity. When the measurable strain range of the sensor is large enough, its response sensitivity to small stress is often poor; Under strain, beyond the measurable range of the sensor

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