Abstract
Graphene-functionalized fibers have attracted substantial attention due to their potential applications in flexible wearable electronics. However, these conventional conductive materials face difficulties in mass production, which limits their large-scale fabrication. In this paper, we report a graphene-coated Calotropis gigantea yarn by pad dyeing with graphene oxide and a reduction process, which endows it with high conductivity, outstanding conducting stability, and scale production capacity. By optimizing the dyeing parameters, the modified yarns display a high electrical conductivity of 6.9 S/m. Range analysis results indicate that the electrical conductivity of the graphene-coated yarns exhibits a strong dependence on the concentration of graphene oxide and pad dyeing cycles. The hydrogen bonding between the fiber and graphene during the dyeing process renders the functionalized yarns stable conductivity to washing and bending. Based on the simple fabrication process and fascinating performance, the graphene-coated yarn show great potential in facile scale production of conductive yarns.
Highlights
In recent years, the research about multifunctional flexible wearable electronic textiles in flexible sensors (Liu et al 2021a; Gandla et al 2020; Wang et al 2020; Lu et al 2020), health indicators (Liu et al 2021b, c; Won et al 2020; Zhao et al 2020), and electromagnetic interference shielding (Ren et al 2018; Ozen et al 2018; Jia et al 2019) has attracted extensive attention due to their great potential as next-generation electronics with the advantages of lightweight, flexibility, and portability, which can be applied for personal motion detection and healthcare, man-machine interaction, artificial intelligence and so forth (Lin et al 2018)
After graphene oxide (GO) modification, we reduced GO into rGO by transferring the GO-coated yarn into the ascorbic acid solvent at 80 °C
We show the samples with good volume conductivity (Sample 2, Sample 5, and Sample 8) to present the performance and make comparisons, which are denoted as rGO-Calotropis gigantea yarns (CGYs)-4, rGO-CGY-7, and rGO-CGY-10 respectively
Summary
The research about multifunctional flexible wearable electronic textiles in flexible sensors (Liu et al 2021a; Gandla et al 2020; Wang et al 2020; Lu et al 2020), health indicators (Liu et al 2021b, c; Won et al 2020; Zhao et al 2020), and electromagnetic interference shielding (Ren et al 2018; Ozen et al 2018; Jia et al 2019) has attracted extensive attention due to their great potential as next-generation electronics with the advantages of lightweight, flexibility, and portability, which can be applied for personal motion detection and healthcare, man-machine interaction, artificial intelligence and so forth (Lin et al 2018). The hydrogen bonding between the fiber and graphene during the dyeing process renders the functionalized yarns stable conductivity to washing and bending.
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