In this study, Pt-doped α-Fe₂O₃ mesoporous microspheres were prepared by a simple solvothermal method and used for the detection of acetone. XRD, SEM, TEM, Raman, FT-IR, XPS, UV–vis and O₂-TPD were utilized to characterize the structure and chemical properties of the samples. Different components were prepared by controlling the amount of the amount of Pt, and the corresponding sensing performance detection was carried out. The excellent sensing performance was obtained in the sample of 2 at% Pt-doped α-Fe₂O₃ (Pt_2%-Fe). At a lower operating temperature (175 °C), the Pt_2%-Fe sensor response of 100 ppm acetone reaches 105, which is 2.5 times of pure α-Fe₂O₃. Even the concentration reduces to 20 ppb acetone, the response can still reach 1.24 at 175 °C. Meanwhile, the favorable sensing performance can still be maintained under high humidity (90 % RH). The addition of Pt increases the specific surface area and reduces the band gap of the sensitive material. The excellent acetone sensing performance indicated that doping Pt effectively increases the adsorption capacity (catalytic properties) of the surface for the sensitive material and the sensitivity to the target gas (alter in the depletion layer). Hence, this high response, low detection limit and good moisture resistance sensor has a significant potential in the detection of acetone in human breath.

本研究采用简单的溶剂热法制备了Pt掺杂的α -Fe ₂ O ₃介孔微球，并用于丙酮的检测。XRD、SEM、TEM、拉曼、FT-IR、XPS、UV-vis和O ₂ -TPD用于表征样品的结构和化学性质。通过控制Pt的用量制备不同的组分，并进行相应的传感性能检测。在2 at% Pt掺杂的α -Fe ₂ O ₃ (Pt _2% -Fe)样品中获得了优异的传感性能。在较低的工作温度 (175 °C) 下，Pt _2%-Fe传感器对100 ppm丙酮的响应达到105，是纯α -Fe ₂ O _3的2.5倍. 即使浓度降低到 20 ppb 丙酮，在 175 °C 时响应仍然可以达到 1.24。同时，在高湿度（90% RH）下仍能保持良好的传感性能。Pt的添加增加了比表面积并减小了敏感材料的带隙。优异的丙酮传感性能表明，掺杂Pt有效地提高了表面对敏感材料的吸附能力（催化性能）和对目标气体的敏感性（在耗尽层发生变化）。因此，这种高响应、低检测限和良好的防潮传感器在检测人体呼吸中的丙酮方面具有显着的潜力。