This technology involves adsorbing a cationic poly(p-phenylene vinylene) precursor onto the surface of graphene to create an aqueous dispersion, alternatingly layering it with negatively charged graphene oxide, and simultaneously converting them into a GPPV/RGO bilayer thin film through chemical treatment.
While graphene's superior electrical and optical properties make it ideal for capacitors, optoelectronic devices, and transparent electrodes, obtaining high-concentration, defect-free aqueous graphene dispersions for industrial-scale solution processing has been difficult. Consequently, reliance on defect-prone graphene oxide has limited improvements in current collection and photoresponsivity in these devices.
This technology uses ultrasonic dispersion of expanded graphite in a PPV precursor—without organic solvents or surfactants—to secure a defect-free graphene dispersion at approximately 1 mg/mL, allowing for precise thickness control via electrostatic layer-by-layer assembly. The resulting multilayer thin film exhibits high electrical conductivity, significantly enhancing capacitor capacity, cycle life, and optoelectronic device photoresponsivity. Applicable to flexible electrochemical capacitor organic current collectors, photodetector photosensitive layers, and wearable electronic electrodes, it enables the realization of high-performance, flexible energy storage devices without metal current collectors.
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