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Fabricating flexible and large-scale graphene-based films through a simple process to achieve excellent electromagnetic interference (EMI) shielding performance is still a daunting challenge. Herein, the flexible and large-area EMI shielding films with ultrathin coating thickness (i.e., 10 μm) and low coating density (i.e., 2.4 mg/cm2) were fabricated through a simple drop-casting approach by using graphene-based conductive ink at room temperature. With the aid of electromagnetic simulation, the optimal square resistance of conductive film for desirable EMI shielding effectiveness is predicted, avoiding the unnecessary costs of error and trial. To solve the vital issue of poor conductivity of reduced graphene oxide (RGO) arising from defects and the serious agglomeration of each filler in ink, a three-dimensional network was constructed by connecting RGO with flexible one-dimensional (1D) conductive fibers (i.e., carbon nanotubes (CNT) and Ag nanowire (AgNW)). The square resistance of the RGO/CNT@Epoxy/AgNW composite film could reach as low as 1.94 ± 0.63 Ω/sq, which exhibited the shielding effectiveness value of 40 dB at a minimum in 8.2–12.5 GHz. These attributes could satisfy the EMI shielding and flexibly conformal demands of most communication equipment.

Surface engineering of one-dimensional (1D) TiO2-based heterostructures is extremely vital to the development of new photocatalysts with superior performances. Herein, the Al2O3heterojunctions onto TiO2nanofibers were facilely fabricated by a surfactant-free approach, viaemploying graphene oxide (GO) sheets as a reliable catalyst of regulating the growth kinetics of heterojunctions. Through adjusting the GO content, the oxygen-containing functional groups of GO provided nucleation sites of Al2O3species while restricting their growth in the limited space. As a result, the morphology of Al2O3heterojunctions evolved from nanoflakes to nanospikes outside the TiO2nanofibers that served as robust skeletons. Owing to the distinctive morphology and the effective electron transfer pathway, the photocurrent density of the spiny RGO/Al2O3/TiO2nanofibers was 3.5-times higher than that of pure Al2O3/TiO2nanofibers counterparts toward photoelectrochemical reaction under visible-light irradiation. The present work highlights the pivotal role of graphene sheets in controlling the hierarchical growth of TiO2-based heterostructures with tunable morphology and compositions.