| Summary: | In this paper, the PdO<sub>x</sub> nanoparticles modified SnO<sub>2</sub> are prepared using sputtering and wet chemical methods. The SnO<sub>2</sub> nanoparticles are separately added to a concentration of 0.75% to 10% PdCl<sub>2</sub> to obtain a PdCl<sub>2</sub>/SnO<sub>2</sub> composite material, which is calcined for 1 to 2 h at the temperatures of 120 °C, 250 °C, 450 °C and 600 °C. The PdO<sub>x</sub>/SnO<sub>2</sub> nanocomposite was characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). Microstructural observations revealed PdO<sub>x</sub> with different chemical states attached to the surface of SnO<sub>2</sub>. Hydrogen response change tests were performed on the obtained PdO<sub>x</sub>/SnO<sub>2</sub> gas sensing materials. The results show that the high gas sensing performance may be attributed to the contribution of the PdO<sub>x</sub>-loaded SnO<sub>2</sub>. In hydrogen, the best sensitivity response was attained at 80 °C, which is 60 times that of pristine SnO<sub>2</sub>. It clarifies the role of PdO<sub>x</sub> in the gas sensing mechanisms.
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