Tensile strain sensor and preparation method and application thereof

Abstract

The invention provides a tensile strain sensor and a preparation method and application thereof. The tensile strain sensor comprises a flexible substrate layer and a sensing layer. The sensing layer is partially embedded into the flexible substrate layer and comprises a conductive metal particle layer and a conductive carbon material layer, and the conductive carbon material layer is arranged between the flexible substrate layer and the conductive metal particle layer. Because of the self-locking effect at the interface of the double conductive sensing layers of the conductive carbon materiallayer and the conductive metal particle layer, a problem of continuous conduction of the strain material under large tensile strain is solved; and the sensor has the characteristics of high stretchability, high sensitivity, wide strain range, good stability and good durability.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a stretchable strain sensor and its preparation method and application. Background technique [0002] Wearable electronic sensors have attracted extensive attention in the fields of human clinical diagnosis, health monitoring, human-machine interface, electronic skin, and intelligent robots. As an important member of electronic sensors, stretchable strain sensors have developed rapidly in recent years and can be used to detect various physiological activities of the human body, including large-scale bending movements of hands, arms, legs, etc. and deep breathing, swallowing, muscle vibration, blood pressure and pulse and other small-scale deformations. In particular, stretchable strain sensors for applications in biomechanics, physiology, and kinematics are required to have high sensitivity, wide strain range, and excellent durability. [0003] Among these requirements, high st...

AI Technical Summary

Problems solved by technology

However, there are still several problems with the strain sensor: a strain sensor with high sensitivity, but its stretching range is small; or a sensor with a wide stretching range, but its low sensitivity is very low

Chinese patent CN108332647A proposes a flexible piezoresistive strain sensor. Its main technical solution is to use metal glass film as the sensitive material. Although it has good linearity, its sensitivity coefficient is only 2.5

Chinese patent CN107655398A proposes a high-sensitivity stretchable flexible strain sensor. Its main technical solution is to use polymer to encapsulate the polyurethane sponge composite material covered by graphene and nickel film with cracks. Although the largest strain sensor The gage factor can reach 3300, but its stretch range is only 65%

In 2016, Shi et al. reported a graphene Strain sensor of sheet and silicone rubber composite material, when the sensor thickness is 10 μm, it has the largest gage factor value (164.5), but its tensile limit is 12%

Based on the above, stretchable strain sensors with high stretchability and sensitivity as well as good stability and durability are still a challenge.

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