Fig. 1. FESEM images of the Bi₂O₃ nanoblocks， g-C₃N₄ nanosheets and Bi₂O₃/g-C₃N₄ composite

Fig. 2. EDS spectrum of the Bi₂O₃/g-C₃N₄ composite

Fig. 3. XRD patterns of the Bi₂O₃ nanoblocks， g-C₃N₄ nanosheets and Bi₂O₃/g-C₃N₄ composite

Fig. 4. High-resolution XPS spectra of C 1s， N 1s， Bi 4f and O 1s of the Bi₂O₃/g-C₃N₄ composite

Fig. 5. Detection performance of the UV photodetectors based on Bi₂O₃ nanoblocks and Bi₂O₃/g-C₃N₄ composite under UV light illumination

Fig. 6. The photodetection performance of the Bi₂O₃/g-C₃N₄ UV photodetector under UV light illumination with different intensities

Fig. 7. Diagram of the detection mechanism of the Bi₂O₃/g-C₃N₄ UV photodetector