Fig. 1. Structure of UV detector based on WO₃ nanosheets

Fig. 2. SEM images and EDS spectrum of WO₃ nanosheets

Fig. 3. XRD patterns of FTO substrate and WO₃ nanosheets

Fig. 4. Raman spectrum of WO₃ nanosheets

Fig. 5. UV-visible absorption spectrum and corresponding plot of （αhν）² versus hν of WO₃ nanosheets

Fig. 6. Photocurrent response and enlarged view of rising and decaying edges of WO₃ nanosheets UV detector with UV light on and off

Fig. 7. UV photoresponse transients with different UV light intensities， corresponding plot of photocurrent densities versus light intensities， rising and decaying time and responsibility as well as detectivity of WO₃ nanosheets UV detector

Fig. 8. Photocurrent responses of WO₃ nanosheets UV detector illuminated with UV light on/off for 50 cycles