Preparation Of Self-Healing Stretchable Conductors As Strain Sensors

In recent years,the synthesis of three-dimensional aerogels using silver nanowires as materials and the orientation freezing method has become a research hotspot.Based on this,this paper uses silver nanowires and graphene materials,through orientation freezing and vacuum filling method to obtain a stretchable self-repairing elastic conductor.The elastic conductor is prepared into a flexible capacitive sensor that can be stretched,self-healing,and capable of sensing human behavior.The specific research contents of this article are as follows:1.The silver nanowires and graphene are used to freeze the silver nanowires and partially reduced graphene,and then continue to reduce the graphene,and freeze-drying to obtain an aerogel.Hydrogels with excellent electrical conductivity were synthesized by vacuum filling and introducing silver-sulfur coordination bonds.The elastic conductor has good flexibility and stable mechanical properties.The tensile strain of the elastic conductor is 3000% and when the strain is 2600%,the resistance changes by 684%;and after 100 cycles,when the strain is 2600%,the resistance changes by 1088%,demonstrating stable conductivity.Based on the dynamic effect of the silver-sulfur bond,the elastic conductor not only maintains good electrical conductivity but also has a 90% self-healing efficiency after being irradiated under near infrared light and placed in an energized circuit.The elastic conductor after healing still maintains excellent mechanical properties and stable conductivity.2.In this paper,an oil gel is synthesized through polymerization,and the tensile strain is 1000%.Because the oil gel has a gold-sulfur coordination bond,it can realize self-healing,and the tensile strain is up to 900%.The oil gel is used as the dielectric layer material of the capacitor,and the elastic conductor is used as the electrode material.The two are stacked together to obtain an integrated stretchable capacitive sensor with self-healing properties.The strain of the sensor can be up to 1000%,and during the stretching process,the capacity has a linear relationship with the stretching ratio.The capacitive sensor exhibits high sensitivity under low strain.In addition,the capacity value of the capacitive sensor can remain stable even after 1000 cycles of stretching.What's more,when the sensor is placed in the joints of the human body,the capacity will change to detect human behavior.Irradiated under the near infrared laser and placed in the energized circuit,the sensor device can realize self-repair.The sensor also has stable electromechanical performance since it is repaired,and maintains a highly consistent sensing performance with the original sensor.Therefore,the sensor has great application prospects in the field of wearable electronic devices.