The gas sensing properties of Al-doped ZnO nanoparticles (NPs), which were synthesized via a hydrothermal method, have been described for the detection of volatile organic compounds (VOCs) such as acetaldehyde, toluene, and benzene. The maximum sensing response (R = 2250) of these Al-doped ZnO NPs was observed upon exposure to 10 ppm acetaldehyde at an optimal operating temperature of 500 °C, which was almost 173 and 125 times higher than that observed for toluene and benzene, respectively. The highest dipole moment of acetaldehyde among the three VOCs is responsible for its highest sensitivity. The Al-doped ZnO NPs also show a higher selectivity toward acetaldehyde than that of different interfering gases and their response to acetaldehyde was superior compared with the previously reported responses of other materials. The enhanced sensing performance of Al-doped ZnO NPs to acetaldehyde compared to undoped ones may be explained by an increase in specific surface area, oxygen vacancies, and conductivity after Al doping.

已经描述了通过水热法合成的Al掺杂的ZnO纳米颗粒（NPs）的气敏特性，用于检测挥发性有机化合物（VOC），例如乙醛，甲苯和苯。这些铝掺杂的ZnO NP的最大传感响应（R = 2250）在500°C的最佳工作温度下暴露于10 ppm乙醛时观察到，比甲苯和苯所观察到的分别高173倍和125倍，分别。三种VOC中乙醛的最高偶极矩是其最高灵敏度的原因。与其他干扰气体相比，掺铝的ZnO NPs对乙醛的选择性也比不同的干扰气体高，并且它们对乙醛的响应也优于先前报道的其他材料。