Yolk-shell nanomaterials with controlled morphology have received great attention because of their promising applications in gas sensing. Here, we reported the facile synthesis of pure and 1–5 mol% Sn doped Co₃O₄ yolk-shell nanostructures by calcinating the Co based metal–organic framework (MOF, ZIF-67) prepared from hydrothermal method. The morphologies of the as-obtained samples were characterized by various experimental techniques. Furthermore, the gas sensing properties were systematically measured. Gas sensors based on 3 mol% Sn doped Co₃O₄ yolk-shell nanostructures exhibited extremely enhanced response to ethanol at 200 °C (R_g/R_a = 13.4–100 ppm at 200 °C) and low detection limit (R_g/R_a = 1.3–1 ppm ethanol at 200 °C). Most importantly, the gas response to 100 ppm ethanol is still maintained well after continuous measurement for 20 days.

具有可控形态的卵黄壳纳米材料因其在气体传感中的应用前景而备受关注。在这里，我们报道了通过煅烧由水热法制备的钴基金属-有机骨架（MOF，ZIF-67），可以轻松地合成纯的和1-5 mol％的Sn掺杂的Co ₃ O ₄卵黄壳结构。通过各种实验技术表征所获得的样品的形态。此外，系统地测量了气体感测性能。基于3 mol％的Sn掺杂的Co ₃ O ₄卵黄壳纳米结构的气体传感器在200°C（R _g / R _a 在200°C时= 13.4–100 ppm 乙醇）和低检测限（在200°C时R _g / R _a = 1.3–1 ppm乙醇）。最重要的是，连续测量20天后，对100 ppm乙醇的气体响应仍保持良好。