In recent years, the use of metal ferrites as sensing materials has aroused more and more interest. However, there is a challenge in the use of cobalt ferrite as ethanol sensor with good gas-sensing properties. In this paper, CoFe₂O₄ was successfully synthesized by using a facile route. The as-synthesized CoFe₂O₄ exhibited n-type gas-sensing behavior that the resistance decreases in a reducing gas atmosphere. When applied as sensing materials, CoFe₂O₄ sensors show good sensitivity to ethanol. At 200 °C working temperature, the response value of CoFe₂O₄ calcined at 400 °C (CFO-400) sensor to 100 ppm ethanol gas is 110, which is much higher than that of CoFe₂O₄ ethanol sensor in other studies. Additionally, the CFO-400 sensor shows satisfactory repeatability and stability, as well as high selectivity to ethanol detection compared to other gases. The possible sensing mechanism is investigated in this paper. This work not only displays a facile way to synthesize CoFe₂O₄, but also provides potential material for gas sensors in future applications.

近年来，使用金属铁氧体作为传感材料引起了越来越多的兴趣。然而，使用钴铁氧体作为具有良好气敏特性的乙醇传感器存在挑战。本文采用简便的路线成功合成了CoFe ₂ O _{4 。}合成后的CoFe ₂ O ₄表现出在还原气体气氛中电阻降低的n型气敏行为。当用作传感材料时，CoFe ₂ O ₄传感器对乙醇表现出良好的灵敏度。在200℃工作温度下，CoFe ₂ O _{4的响应值}400℃煅烧（CFO-400）传感器对100 ppm乙醇气体为110，远高于其他研究中的CoFe ₂ O ₄乙醇传感器。此外，与其他气体相比，CFO-400 传感器显示出令人满意的重复性和稳定性，以及对乙醇检测的高选择性。本文研究了可能的传感机制。这项工作不仅展示了一种合成CoFe ₂ O ₄的简便方法，而且为未来应用中的气体传感器提供了潜在的材料。