To further improve the ethanol sensing performance of LaFeO₃ (LFO) nanoparticles, the co-doping of acceptor and donor at La and Fe sites at equal mole amount was designed to increase the oxygen adsorbing ability of the resultant nanoparticles. A series of (La,Ba)(Fe,Ti)O₃ nanoparticles, with the designed mole ratios of Ba/La (Ti/Fe) as 0, 0.25, 0.33, 0.50, and 1.0, were prepared by a citric sol–gel method. XRD confirmed the main phase of orthorhombic LFO, and the impurity phases of cubic BaTiO₃ (BTO) and orthorhombic BaCO₃. The incorporation of Ba and Ti into the LFO lattice was verified by the increased unit cell volume of LFO upon more doping. TEM, BET, and XPS measurements indicated that the appropriate co-doping of Ba and Ti into the LFO lattice and the simultaneous existence of BTO and BaCO₃ resulted in smaller grain size, larger BET surface area, and thus higher concentration of adsorbed oxygen species than those in the pristine LFO nanoparticle. Among all (La,Ba)(Fe,Ti)O₃ sensors, the sensor based on the (La,Ba)(Fe,Ti)O₃ nanoparticles with the designed Ba/La = 0.50 exhibited the highest gas response and sensitivity toward ethanol at the prime working temperature of 132 °C, which was ascribed to the higher surface oxygen coverage contributed by the synergistic effect of co-doping and impurity phases on the number of surface active sites and oxygen adsorbing ability.

为了进一步提高LaFeO ₃（LFO）纳米颗粒的乙醇感测性能，设计了以等摩尔量在La和Fe位置共掺杂受体和施主，以提高所得纳米颗粒的氧吸附能力。通过柠檬酸溶胶制备了一系列（La，Ba）（Fe，Ti）O ₃纳米粒子，其Ba / La（Ti / Fe）的设计摩尔比分别为0、0.25、0.33、0.50和1.0。凝胶法。XRD证实了正交晶LFO的主相以及立方BaTiO ₃（BTO）和正交晶BaCO ₃的杂质相。通过在更多的掺杂下增加LFO的晶胞体积，可以将Ba和Ti掺入LFO晶格中。TEM，BET和XPS测量表明，将Ba和Ti适当地共掺杂到LFO晶格中，同时存在BTO和BaCO ₃导致较小的晶粒尺寸，较大的BET表面积，并因此提高了吸附氧的浓度比原始LFO纳米颗粒中的那些要大。在所有（LA，Ba）的（铁，钛）O ₃传感器，基于（镧，钡）（铁，钛）O传感器₃ 设计的Ba / La = 0.50的纳米颗粒在132°C的主要工作温度下表现出最高的气体响应和对乙醇的敏感性，这归因于共掺杂和杂质相对金属的协同作用，从而提高了表面氧覆盖率。表面活性部位的数目和氧吸附能力。