High-stretchable flexible strain sensor based on two-component polyurethane line and preparation method of sensor

Abstract

The invention discloses a high-stretchable flexible strain sensor based on a two-component polyurethane line. The two-component polyurethane line serves as a base, the surface of the base is coated with an internal conducting layer (short hydroxyl carbon nanotube layer) after KH-550 modification, and the surface of the internal conducting layer is coated with an external conducting layer (hydroxylated graphene nanosheet / silver / silicon rubber cooperative conducting network layer) after KH-550 modification. The strain sensor has the advantages of high stretchability, high stability, high durability, rapid response characteristic and the like and can be used for electronic skin monitoring of human joint movement and gait detection.

Description

technical field [0001] The invention belongs to the field of sensors, in particular to a highly stretchable flexible strain sensor based on two-component polyurethane wires and a preparation method thereof. Background technique [0002] Electronic applications of strain sensors in human motion monitoring, healthcare, speech recognition, robotics, etc. have attracted extensive attention. The strain sensor is the change of resistance or capacitance of the sensitive layer under the action of stress (strain), which can be interpreted as geometric change, tunnel effect, crack formation and expansion, etc. Traditional metal foils and semiconductors (such as zinc oxide, silicon) are the most common strain sensors with ideal sensitivity, but they also have many disadvantages: high cost, poor flexibility, incompatibility with human body, poor strain sensitivity, etc. [0003] In recent years, with the widespread application of wearable devices in human motion monitoring and human be...

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Problems solved by technology

[0006] In order to avoid the deficiencies in the above-mentioned prior art, the present invention proposes a highly stretchable flexible strain sensor based on a two-component polyurethane wire and a preparation method thereof based on a chemically bonded layered dip-coating process. Solve the problems of low stretch, poor stability, and poor durability of existing strain sensors, and improve the ability of strain sensors as wearable devices

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