High-Sensitivity Wearable and Flexible Humidity Sensor\nBased on Graphene Oxide/Non-Woven Fabric for Respiration Monitoring

Abstract

The popularity of\nhumidity sensing for respiratory analysis of\npatients is gradually increasing because of its portability and cost-effectiveness.\nHowever, current flexible humidity sensors are mainly made of polymer\nfilms, whose poor hygroscopicity and breathability reduce their sensitivity\nand comfort. In this study, a highly sensitive humidity sensor was\ndeveloped using non-woven fabric (NWF) coated with graphene oxide\n(GO). Bovine serum albumin was used to improve the adsorption of GO\nonto the NWF, and its effect on sensitivity was investigated by adjusting\nits concentration. High-humidity sensitivity was experimentally validated\nby testing different relative humidity levels, and its fast response\nand excellent feasibility under diverse breathing conditions were\nverified by successful monitoring of fast and deep breathing, differentiating\nnose and mouth breathing, and even identifying simple spoken words.\nThis study developed a breathable and skin-friendly humidity sensor\nbased on GO/NWF, which is a promising device for human healthcare.