Flexible force-sensitive sensor based on silver-embedded nanofibers and preparation method thereof

Abstract

The invention discloses a flexible force-sensitive sensor based on silver-embedded nanofibers and a preparation method thereof. The sensor comprises a flexible force-sensitive resistance film which is connected to a power supply and a current meter in series. The flexible force-sensitive resistance film comprises a silver-embedded nanofiber film which is formed by alginate / silver nanoparticle composite nanofibers. The alginate / silver nanoparticle composite nanofibers are sodium alginate nanofibers prepared by an electrostatic spinning method, alginate silver nanofibers are made through ion exchange, and the alginate / silver nanoparticle composite nanofibers are obtained through reduction of silver ions. The sensitive resistor of the sensor has good flexibility and can be directly adhered to a skin, the skin is not hurted, the temperature performance and sensitivity are good, and the monitoring of physiological activities such as a pulse, a breathing frequency and a heartbeat can be realized. At the same time, the sensor also has an antibacterial effect and is more safe to directly contact with the skin.

Description

technical field [0001] The invention belongs to the field of sensors, and in particular relates to a flexible force-sensitive sensor based on silver-loaded nanofibers and a preparation method thereof. Background technique [0002] Due to the urgent needs of modern society for health monitoring, human-computer communication, and detection of pressure distribution, flexible pressure sensors based on the working principle of pressure sensors have become an emerging research hotspot. At present, the application of pressure sensors is not limited to water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military industry, petrochemical, ships, machine tools, pipelines and other industrial production. There is also a great demand in sports health care, that is, the detection of exercise status, respiratory conditions, and health indicators. With the development of society, the miniaturization of electronic devices has be...

AI Technical Summary

Problems solved by technology

However, due to the limitation of material properties and preparation process, the research on flexible electronic devices based on pressure sensors is less, and the electronic skin with both flexibility and antibacterial properties on the skin is still blank.

The polymer material micro-nanofiber membrane prepared by electrospinning method has good flexibility, and the composite nanofiber prepared by doping conductive material particles into the electrospinning precursor has certain electrical conductivity, and has potential in flexible sensors. Application prospects, especially silver nanoparticles with antibacterial and conductive dual functions, composite fibers obtained by using silver nanoparticles as dopants can theoretically have conductivity and antibacterial properties, and have good application prospects. However, the existing electrostatic There are many shortcomings in the preparation of silver-loaded nanofibers by spinning. In the direct blending process, the doping amount of silver nanoparticles is seriously restricted by the spinnability; and the nanoparticles are easy to agglomerate, and it is difficult to obtain a uniform spinning precursor solution, resulting in The distribution of silver nanoparticles in the material is not uniform, and the diameter of the prepared nanofibers is not uniform, which affects the performance of the material

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