Abstract
In this paper, we synthesized a WO3/MoO3 porous and hollow microsphere. Firstly, the WO3 nanorods were synthesized by one-step hydrothermal method. Secondly, the WO3 nanorods were added to the MoS2 precursor solution, and the mixture was further hydrothermally treated. Finally, the obtained samples were heated and oxidized in air to obtain WO3/MoO3 hollow nanospheres. The morphology and microstructure of the composite were observed by SEM and TEM, and its crystal structure was characterized by XRD. The results showed that the gas response of WO3/MoO3 is greatly improved by the addition of MoO3. The response is up to 28000 to 100 ppm ammonia and the limit of detection is 100 ppb when the WO3/MoO3 sensor is operated at the optimum operating temperature. It has basically no response to other volatile organic gases, which indicates that the sensor has an excellent selectivity. Furthermore, we also studied the gas sensing mechanism of WO3/MoO3 porous and hollow sphere and the effect of different amount of WO3 on the gas response of the composite.
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