Transparent, Flexible\nNanoporous Sensors with Humidity\nand Pressure Sensing Capabilities for Sports Health Status Monitoring

Abstract

Exercise can strengthen the body, but due to the difference\nin\nexercise volume, which makes people’s cardiorespiratory adaptive\ncapacity different, unreasonable exercise load intensity is very easy\nto induce cardiovascular accidents. In this paper, an electronic skin\nsensor for monitoring human exercise status is proposed, which is\na dual sensor for detecting changes in humidity and pressure by composites\nof poly(vinyl alcohol) (PVA), citric acid (CA), and silver nanoparticles\n(AgNPs). The nanoporous sensor consisting of a PVA-CA-AgNP composite\nis flexible, lightweight, sensitive, and cost-effective. The sensor\nresponds to unit humidity changes with a sensitivity as high as 0.34%\nRH^–1 when the relative humidity is increased from\n11 to 98%, and the pressure sensing/recovery time is 200/600 ms, respectively,\nwhen compressed by an external force. The sensor can be used not only\nfor monitoring human movement and breathing patterns but also for\nfurther applications in information encryption. The sensor’s\ncontinuous detection of human joint movements and breathing rhythms\nproves its effectiveness in health monitoring and confirms its stability\nand reliability in human movement and health applications.