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Graphene oxide (GO) was in-situ reduced on cotton fabrics by a simple heat treatment, which endowed cotton fabrics with multi-functions. GO was coated on the surface of cotton fabric through a conventional “dip and dry” approach. Reduced graphene oxide (RGO) was obtained from GO in the presence of cotton by heating under the protection of nitrogen. Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and scanning electron microscopy were employed to characterize the complexes of RGO and cotton (RGO/cotton). The RGO/cotton fabrics showed good electrical conductivity, surface hydrophobicity and ultraviolet (UV) protection properties. These properties did not deteriorate significantly after repeated fabric bending and washing. [ABSTRACT FROM AUTHOR]

Graphene/cotton fibers show significant promise in wearable energy storage due to their low cost, porous structure, and exceptional integration ability into wearable systems. However, the eco-unfriendly reductants and standalone electric double-layer capacitor hindered their application. Herein, a green and rapid hydrothermal-electrodeposition method was proposed to fabricate polyaniline (PANI) decorated reduced graphene oxide (rGO)/cotton yarns without using any chemical reductants and oxidants. The PANI/rGO/cotton (PRC) yarn exhibited porous conductive network, structural controllability, and mechanical flexibility. Additionally, the PRC yarn electrode delivers a fast electron transport and ion migration, synergistic energy storage contribution, and a controllable capacitance (up to 81.2 mF cm−1 at 0.2 mA cm−1). The assembled yarn supercapacitor shows a good capacitance (19.8 mF cm−1 at 0.08 mA cm−1), excellent energy-power density (2.7 μWh cm−1 at 40 μW cm−1), and great capacitance retention. This green fabrication of PRC yarns brings new insights into the development of wearable energy storage. [Display omitted] • Polyaniline/reduced graphene oxide/cotton (PRC) composite yarn was made. • A green and rapid hydrothermal-electrodeposition method was proposed. • PRC yarn shows porous conductive network, structural controllability, and flexibility. • PRC yarn electrode shows fast electron/ion transport and synergistic capacitance. • PRC yarn supercapacitor shows good specific capacity, power density and cycle ability. [ABSTRACT FROM AUTHOR]

Despite the strong application potential of graphene in various areas, incorporation of graphene into fibrous system for durable, flexible and reliable wearable applications is still of challenge. We hereby propose the fabrication of reduced graphene oxide (rGO) on PET fabrics through polydopamine (PDA) templating. Dopamine was self-polymerized on PET fabrics to for a PDA layer as a secondary platform for loading graphene oxide (GO) via vacuum filtration, and the as-prepared PET/PDA/GO was immediately reduced to PET/PDA/rGO by hot-pressing. The surface morphology, structure and properties were investigated with the mechanism proposed. The UV protective property and electrical conductivity of the prepared PET/PDA/rGO together with the durability against washing and bending and twisting were studied, and the application of the coated fabrics as wearable sensor was demonstrated. • Reduced graphene oxide (rGO) on PET fabrics was achieved through polydopamine templating. • The coating was completed via vacuum filtration followed by hot-pressing reduction. • PET/PDA/rGO showed excellent UV protective property and electrical conductivity. • The PET/PDA/rGO showed durability against washing, bending and twisting. • The application of the coated fabrics as wearable sensor was demonstrated. [ABSTRACT FROM AUTHOR]