We synthesized SnO₂/NiO composite oxides by microwave-assisted liquid phase deposition to improve their surface physico-chemical properties and gas-sensing selectivity, and we investigated how the molar ratio of Ni²⁺ to Sn⁴⁺ and the microwave power affected their gas-sensing performance. The microstructure, surface physico-chemical states, and morphology of the samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy, respectively. Nitrogen adsorption–desorption isotherms were used to characterize the specific surface areas of the samples. Our results showed that microwave-assisted liquid phase deposition increased the surface-adsorbed oxygen content and the specific surface area of the SnO₂/NiO composite oxide from about 22 to 120 m²/g. When the molar ratio of Ni²⁺ to Sn⁴⁺ was 0.1, the gas response to 1000 ppm ethanol gas reached 84.7 at a lower working voltage of 3.5 V. However, the optimum working voltages for methanol and acetone gas were 4.5 and 4.0 V, respectively. Thus, a new method was found to improve the selectivity of the gas sensor. Moreover, at a working voltage of 4.0 V, the gas response of a SnO₂/NiO gas sensor synthesized by microwave-assisted liquid phase deposition with the optimum radiation power of 450 W to 1000 ppm acetone gas was 49.7, twice that of a sensor synthesized by traditional liquid phase deposition.

我们通过微波辅助液相沉积法合成了SnO ₂ / NiO复合氧化物，以改善其表面物理化学性质和气敏选择性，并研究了Ni ²⁺与Sn ⁴⁺的摩尔比以及微波功率如何影响它们。气敏性能。分别通过X射线衍射，X射线光电子能谱和扫描电子显微镜对样品的微观结构，表面物理化学状态和形态进行表征。氮气吸附-解吸等温线用于表征样品的比表面积。我们的结果表明，微波辅助液相沉积可增加表面吸附的氧含量和SnO的比表面积₂ / NiO复合氧化物为约22至120 m ² / g。当Ni ²⁺与Sn ⁴⁺的摩尔比为0.1时，在3.5 V的较低工作电压下，对1000 ppm乙醇气体的气体响应达到84.7。但是，甲醇和丙酮气体的最佳工作电压为4.5和4.0 V ， 分别。因此，发现了一种新的方法来改善气体传感器的选择性。此外，在4.0 V的工作电压下，通过微波辅助液相沉积合成的SnO ₂ / NiO气体传感器的最佳响应功率为450 W，对1000 ppm丙酮气体的气体响应为49.7，是传感器的两倍。由传统的液相沉积合成。