【摘要】 确定CO₂体积分数对于准确的碳评估至关重要，碳评估旨在减少温室气体排放。文中研究的重点是开发用于车辆排放中CO₂检测的敏感材料。为此，使用火焰喷雾热解（FSP）制备了B位掺杂的LaFe_1-xCo_xO₃纳米粒子。通过分析CO₂体积分数为5%～15%的气体混合物来评估原型CO₂传感器的动态响应性。B位掺杂的比例显著影响材料的性能。LaFe_0.95Co_0.05O₃传感器在LaFe_1-xCo_xO₃传感器（x=0,0.05,0.10,0.15）中表现出最大的灵敏度（S=2.1）和相对较短的响应时间(t₉₀=62 s)。观察到的响应增强可归因于氧空位的增加和掺杂的B位阳离子的氧化态提高。此外，该传感器除了具有很强的稳定性外，还对NH₃、NO、NO₂和CO表现出优异的选择性。最终讨论了包括氧空位参与在内的传感机制。更多还原

【Abstract】 Measuring CO₂ concentration is fundamental to carbon accounting, which seeks to reduce greenhouse gas emissions.This research focused on the development of sensitive materials for CO₂ detection in vehicle emissions.LaFe_1-xCo_xO₃ nanoparticles with B-site doping were produced using flame spray pyrolysis（FSP） for this purpose.The prototype CO₂ sensors’ dynamic responsiveness was assessed by analyzing a gas mixture containing 5%～15% CO₂.The extent of B-site doping significantly influenced the material’s performance.The LaFe_0.95Co_0.05O₃ sensor demonstrates the maximum sensitivity（S=2.1） and a comparatively short response time(t₉₀=62 s) among the series of LaFe_1-xCo_xO₃ sensors（x=0,0.05,0.10,and 0.15）.The enhancement of the response may be ascribed to the augmentation of oxygen vacancies and the elevated valence of B-site cations resulting from the introduction of B-site doping.Moreover, the sensor demonstrated excellent selectivity towards NH₃,NO,NO₂ and CO,in addition to strong repeatability.The sensing mechanism including the participation of oxygen vacancies was ultimately discussed.更多还原