Multispecies-Coadsorption-Induced Rapid Preparation of Graphene Glass Fiber Fabric and Applications in Flexible Pressure Sensor Based on the Hierarchical Conductive Configuration

Abstract

Direct CVD growth of graphene on dielectric/insulating materials is a promising strategy for subsequent transfer-free applications of graphene. However, graphene growth on noncatalytic substrates is faced with thorny issues, especially the limited growth rate, which severely hinders the mass production and practical applications. Herein, graphene glass fiber fabric (GGFF) was developed by graphene CVD growth on glass fiber fabric. Dichloromethane is creatively applied as carbon precursor to accelerate graphene growth, which has a low decomposition energy barrier, and more importantly, the produced high-electronegativity Cl radical can enhance adsorption of active carbon species by Cl−CH2 coadsorption and facilitate H detachment from graphene edges. Consequently, ~3 orders of magnitude increase of growth rate and ~960 times increase of carbon utilization, compared with conventional methane precursor, were realized. The advantaged hierarchical conductive configuration of lightweight, flexible GGFF makes it a ultrasensitive pressure sensor for human motion and physiological monitoring, such as pulse and vocal signals.