Highly\nStretchable and Wearable Graphene Strain Sensors\nwith Controllable Sensitivity for Human Motion Monitoring

Abstract

Because\nof their outstanding electrical and mechanical properties,\ngraphene strain sensors have attracted extensive attention for electronic\napplications in virtual reality, robotics, medical diagnostics, and\nhealthcare. Although several strain sensors based on graphene have\nbeen reported, the stretchability and sensitivity of these sensors\nremain limited, and also there is a pressing need to develop a practical\nfabrication process. This paper reports the fabrication and characterization\nof new types of graphene strain sensors based on stretchable yarns.\nHighly stretchable, sensitive, and wearable sensors are realized by\na layer-by-layer assembly method that is simple, low-cost, scalable,\nand solution-processable. Because of the yarn structures, these sensors\nexhibit high stretchability (up to 150%) and versatility, and can\ndetect both large- and small-scale human motions. For this study,\nwearable electronics are fabricated with implanted sensors that can\nmonitor diverse human motions, including joint movement, phonation,\nswallowing, and breathing.