Hollow MnFe₂O₄ nanoparticles were successfully synthesized based on simple galvanic replacement reaction with Mn₃O₄ as a precursor. The chemical composition and nanostructure of the as-prepared samples were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. MnFe₂O₄ was applied to decorate interdigital electrodes and the obtained sensors were used to detect fourteen kinds of volatile organic compounds at different operation temperature from 160 °C to 280 °C.

Results show that the sensor has good sensitivity, repeatability and long-term stability for ethanol gas determination at 210 °C. The detection linear range for ethanol is 2 ∼ 400 ppm, and the response and the recovery time was 7.5 s and 8.0 s, respectively. Besides, the fabricated sensor also displayed decent performance in measuring n-decane in the concentration range of 2 ∼ 400 ppm at 260 °C. Finally, gas-sensing mechanism of the prepared sensor was clearly studied.

基于简单的电流置换反应，以Mn ₃ O ₄为前体，成功合成了空心MnFe ₂ O ₄纳米颗粒。通过扫描电子显微镜，透射电子显微镜，X射线衍射和X射线光电子能谱表征所制备样品的化学组成和纳米结构。MnFe ₂ O ₄用于装饰叉指电极，所获得的传感器用于在160℃至280℃的不同工作温度下检测14种挥发性有机化合物。

结果表明，该传感器对于210°C的乙醇气体测定具有良好的灵敏度，可重复性和长期稳定性。乙醇的检测线性范围为2〜400 ppm，响应和恢复时间分别为7.5 s和8.0 s。除此之外，在260°C的2〜400 ppm浓度范围内，所制造的传感器在正癸烷的测量中也显示出不错的性能。最后，对所制备传感器的气敏机理进行了清晰的研究。