In this paper, we reported the controlled synthesis of tungsten disulfide/reduced tungsten oxide (WS/WO) heterojunctions for highly efficient room temperature NO and ammonia (NH) sensors. X-ray diffraction analysis revealed the formation of the oxygen-deficient WO phase along with WS. Field-emission scanning electron microscopy and transmission electron microscopy displayed the formation of WS flakes over WO nanorods. X-ray photoelectron spectroscopy showed the presence of tungsten in W, W, and W oxidation states corresponding to WS and WO, respectively. The WS/WO heterojunction sensor exhibited sub-ppm level sensitivity to NO and NH at room temperature. The heterojunction sensor detected 0.6 ppm NO and 0.5 ppm NH, with a corresponding response of 7.1 and 3.8%, respectively. The limit of detection of the sensor was calculated to be 0.05 and 0.17 ppm for NH and NO, respectively. The cyclic stability test showed that the sensor exhibited high stability even after 24 cycles for the detection of NH and 14 cycles for NO. Compared to pristine WO and WS, the WS/WO heterojunction showed high selectivity toward NO and NH. The results could be useful for the development of room temperature NO and NH sensors.
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