Preparation and Photoelectric Properties of Co3O4@BiVO4 Composite Thin Films
;In this paper,FTO conductive glass was used as a substrate to successfully prepare Co3O4 thin films with controlled morphology by hydrothermal method.Using the prepared Co3O4 thin films as the base,Co3O4@BiVO4 composite thin films with varying amounts of BiVO4 were successfully prepared by controlling the number of spin-coating cycles.The phase composition and microstructure were analyzed using X-ray diffraction(XRD)and field-emission scanning electron microscopy(FESEM).Additionally,their optical absorption and photoelectric properties were measured using a UV-3600 UV-Vis spectrophotometer and an electrochemical workstation.Results indicate that,based on the XRD patterns of the Co3O4@BiVO4 composite thin films,the composite materials were successfully prepared.From the FESEM images,it can be observed that the prepared Co3O4@BiVO4 composite thin films possess a continuous,uniform,and dense surface,with the Co3O4 thin films growing uniformly as nanowires,and the spin-coated BiVO4 uniformly coating the surfaces of Co3O4 nanowires in a block-like manner.The optical absorption spectrum reveals enhanced light absorption of the Co3O4@BiVO4 composite thin films compared to pure Co3O4 thin films.Under zero bias voltage and illumination,the photoelectrical performance of the Co3O4@BiVO4 composite thin films surpasses that of pure Co3O4 thin films.Electrochemical test results demonstrate that the Co3O4@BiVO4-3 composite thin films,which were spun-coated three times,showing optimal photoelectrical performance,with a maximum photocurrent approximately 18.4 times that of pure Co3O4 thin films.The responsivity of the device is 105.5 μA/W,with a detectivity of up to 1.988 × 1011 Jones.
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