Nanocubes derived from pure In₂O₃ and xPr-In₂O₃ (x = 1, 2, 3 and 5 mol.%) were synthesized using a facile hydrothermal method, followed by calcination. The morphological and structural characterization demonstrated that as-synthesized samples presented regular cubes that decreased in size with the increase of the Pr doping. The data showed that the sensing performances of sensors based on In₂O₃ were notably improved after the Pr doping. Among them, the sensor based on 2 mol.% Pr-In₂O₃ had the best sensing performance towards the triethylamine (TEA) gas, including a high response (R_a/R_g = 260 to 100 ppm TEA gas, which is about 12 times higher than that of the sensor based on pure In₂O₃), a short response time (2 s), and a low detection limit (0.2 ppm) at 350 °C. The mechanism responsible for the enhancement of sensing performance was attributed to the improvement of the vacancy content of 2 mol.% Pr-In₂O₃, which promoted the oxidation–reduction reaction with the TEA gas that occurred on the materials surface.

使用简便的水热法合成了由纯In ₂ O ₃和x Pr-In ₂ O ₃（x = 1、2、3和5 mol。％）衍生的纳米立方，然后进行煅烧。形态和结构表征表明，合成样品呈现规则的立方体，其尺寸随着Pr掺杂的增加而减小。数据表明，Pr掺杂后，基于In ₂ O ₃的传感器的感测性能得到明显改善。其中，基于2 mol。％Pr-In ₂ O ₃的传感器对三乙胺（TEA）气体具有最佳的传感性能，包括高响应性（R _a / R _g = 260至100 ppm TEA气体，约为基于纯In ₂ O ₃的传感器的12倍），响应时间短（2 s）和低检测限（0.2 ppm） ）在350°C。增强传感性能的机理归因于2摩尔％Pr-In ₂ O ₃的空位含量的提高，这促进了与材料表面发生的TEA气体的氧化还原反应。