Sustainable Engineering\nof the Wearable Sensor for\nNoninvasive Health Monitoring Using Exfoliated Layered Double Hydroxide/Reduced\nGraphene Oxide/Poly(vinyl alcohol) Electrospun Fiber Composites

Effective wearable sensors have substantial opportunities\nin robot–human\ncommunication, human motion monitoring, and implantable devices. Strain\nsensors are believed to detect physiological activity and play a significant\nrole in the personalized biomedical industry and flexible electronics.\nElectromechanical sensors with high sensitivity and linearity attain\ngreat scientific attention. A fabricated wearable sensor based on\nlayered double hydroxide and rGO integrated into the PVA fiber utilizing\nelectrospinning is highlighted herein. The resultant film encapsulated\nwith PDMS is a sensing device to monitor human joints efficiently.\nOwing to its unique structure and chemical environment, this sensor\nexhibits a wide sensing range of up to 29% stretching while retaining\nhigh sensitivity as high as ∼430.60. Under stretching conditions,\nthe microstructure and conductive pathway rearrange their position,\nsignifying high responsiveness in periodic operation. Due to the fibrous\nmorphology and superior dispersion of the nanohybrid, the tensile\nstrength and elongation at break improved by ∼286 and 29%,\nrespectively. The fabricated sensor exhibited repeated piezoresistive\nperformance under strains of up to 26%, resulting in low hysteresis\n(18%). In addition, the fabricated sensor showed quick response time\n(<100 ms) and long cyclic stability, which is beneficial for real-time\nhuman motion monitoring. The potential applications in various human\njoint movements, including the finger, elbow, wrist, and knee, have\npaved the way for human motion detection and wearable devices.