Fig. 1. XRD pattern of Pt-WO₃ nano film

Fig. 2. FE-SEM image of Pt-WO₃ nano film(×50000)

Fig. 3. FE-SEM image of Pt-WO₃ nano film (×1000)

Fig. 4. EDS spectrum of Pt-WO₃ nano film

Fig. 5. Transmission hydrogen sensor system diagram

Fig. 6. Transmission power curves of Pt-WO₃ nano-films at different annealing temperatures

Fig. 7. Photograph of Pt-WO₃ nano film when annealing at 400 ℃. (a)Film is placed in the air; (b) film is placed in a hydrogen gas chamber with a volume fraction of 5% for about 5 min

Fig. 8. Hydrogen response amplitude change rate curve of the film at different annealing temperatures

Fig. 9. Film repeatability test results at 400 ℃ annealing temperature

Fig. 10. Reduction time curve of thin films under different hydrogen volume fractions