Abstract
The room temperature gas sensor has attracted sufficient attention due to the fact that low-power products are more suitable for practical environments. However, developing gas sensors with low detection limits remains challenging. In this paper, a room-temperature sensor was prepared by in situ growth of WO3 nanospheres on SnO2 inverse opal (IO) by aerosol assisted chemical vapor deposition (AACVD) method, detecting ppb level of ammonia. The WO3 nanospheres are directly fabricated on IO, and their elemental composition, morphology and structure is characterized using XRD, SEM and TEM. The results show that WO3 nanospheres have been prepared on SnO2 IO successfully. It showes that the WO3/SnO2(WS) type sensor has a detection limit as low as 1 ppb at room temperature from the gas sensitivity data. In addition, the sensor's response value to 100 ppm NH3 reached 65 %. Its excellent sensing performance depends on the distinctive morphology features of WO3 and SnO2. The hierarchical characteristic effectively enhances the sensing performance for NH3. Consequently, this presents a feasible solution for fabricating the room temperature NH3 sensor.
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