Abstract
Functionalized α-Fe2O3 films were widely applied in electrochemical electrodes, energy conversion, and magnetic recording devices. However, the performance stability still needs be improved and evaluated, due to its high physical and chemical activity. Herein, graphene oxide (GO) was chosen to improve the structural stability of α-Fe2O3 films. The layered GO/α-Fe2O3/GO (GFG) sandwich films are successfully grown on ITO glass substrate by the self-assembly method in air-liquid interface. From cross-sectional morphologies, the double-layered GFG sandwich film displays the good stacking structures without delamination. According to XRD, UV–vis, and SEM analysis, the double-layered GFG sandwich film is uniformly composed of alternating GO and α-Fe2O3 layers with significant interlayer coupling. From cyclic voltammetry (CV) curves, these GFG sandwich films present the electrochemical oxidation and reduction peaks, which is weakened with the increasing of thickness. The Nyquist plot of double-layered GFG sandwich film has a larger semi-circle, indicating that the corrosion resistance is oubvious improved. The dielectric constant and dielectric loss of double-layered GFG sandwich film also show an obvious enhancement.
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