1. A highly sensitive, multifunctional, and wearable mechanical sensor based on RGO/synergetic fiber bundles for monitoring human actions and physiological signals.
- Author
-
Yin, Fuxing, Li, Xinxin, Peng, Huifen, Li, Fang, Yang, Kai, and Yuan, Wenjing
- Subjects
- *
DETECTION limit , *GRAPHENE oxide , *WEARABLE technology , *TENSILE strength , *MEDICAL care - Abstract
Highlights • A simple process to fabricate flexible and highly sensitive mechanical sensors based on RGO/synergetic fiber bundles with various sensing functions including stretching, pressing, bending, vibration and torsion. • The mechanical sensor exhibited a high sensitivity (GF = −8.9), low limit of detection (0.05%) and wide sensing range (up to 75%) for tensile strain. • The sensor can be employed to detect full-range human actions from subtle physiological signals e.g. phonation, respiration, and real-time pulse wave to human physical activities e.g. finger joint bending, typing or grasping. • Large-area sensor arrays are successfully fabricated to spatially map pressure stimuli. Abstract We propose a flexible, multifunctional and highly sensitive mechanical sensor that can monitor various mechanical strains induced via stretching, pressing, bending, vibration and torsion. The sensor demonstrates a well-designed conductive fiber alignment based on synergetic fiber bundles coated with a thin reduced graphene oxide (RGO) layer (SF/RGO). When stretched, the fiber bundles fracture into gaps, islands, and bundles bridging the gaps; thus, allowing the conductive fiber bundles to serve as mechanical sensors capable of detecting trace tensile strain down to 0.05% with a high sensitivity (Gauge Factor = −8.9). Furthermore, the sensor also demonstrated high durability, wide sensing range (75% for strain, and 36 kPa for pressure). These remarkable features endow our sensing devices to monitor full-range human motions from subtle bio-signals e.g. pulse wave, phonation and respiration to human physical actions e.g. finger typing, bending or grasping. Furthermore, large-area sensor arrays are successfully fabricated to spatially map pressure stimuli, demonstrating great potential for applications in wearable electronics and healthcare. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF