Yellow tungsten oxide, more specifically, yellow tungsten oxide film (more often known as tungsten trioxide thin film or WO3 thin film), may be applied for coal gasification system. It has been reported that WO3 films are fabricated into H2S sensors for applying in coal gasification plants.
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The reports indicate that inherent processes in coal gasification plants produce hazardous H2S, which must be continuously and efficiently detected and removed before the fuel is used for power generation. The experts fabricated WO3 thin films by radio-frequency reactive magnetron-sputter deposition, and the prepared film was used for H2S sensors in coal gasification plants.
They investigated the effect of growth temperature, which is varied in the range of 30-500 °C, on the growth and microstructure of WO3 thin films. Characterizations made using scanning electron microscopy (SEM) and x-ray diffraction (XRD) indicate that the effect of temperature is significant on the microstructure of WO3 films. XRD and SEM results indicate that the WO3 films grown at room temperature are amorphous, whereas films grown at higher temperatures are nanocrystalline. The average grain-size increases with increasing temperature. WO3 films exhibit smooth morphology at growth temperatures ≤300 °C while relatively rough at >300 °C. The analyses indicate that the nanocrystalline WO3 films grown at 100-300 °C could be the potential candidates for H2S sensor development for application in coal gasification systems.
