An ethanol gas sensor based on lead sulfide (PbS) quantum dots (QDs)-decorated zinc oxide (ZnO) nanorods were demonstrated in this article. The PbS QDs/ZnO film was fabricated via tuning PbS QDs deposition onto the hydrothermally synthesized ZnO nanorods via successive ionic-layer adsorption and reaction (SILAR) method. The PbS QDs/ZnO nanorods nanocomposite was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope and transmission electron microscope. The ethanol gas sensing properties of the PbS QDs/ZnO nanorods-based sensor with different SILAR layers of PbS QDs was investigated at room temperature. The experimental results showed that high response, short response and recovery time, and good repeatability were yielded for the PbS QDs/ZnO nanorods-based sensor, and the optimal SILAR cycle of PbS QDs was discovered to achieve the best ethanol gas sensing performance. The possible sensing mechanism of the PbS QDs/ZnO nanorods-based sensor was attributed to the porous flower-like morphologies, heterojunction nanostructure and high ratio of accessible sites for gas diffusion.

本文展示了一种基于硫化铅（PbS）量子点（QDs）修饰的氧化锌（ZnO）纳米棒的乙醇气体传感器。通过连续的离子层吸附和反应（SILAR）方法，将PbS QDs沉积到水热合成的ZnO纳米棒上，从而制备了PbS QDs / ZnO膜。通过X射线衍射，X射线光电子能谱，扫描电子显微镜和透射电子显微镜对PbS QDs / ZnO纳米棒纳米复合材料进行了表征。在室温下研究了具有不同SILAR层的PbS QDs的PbS QDs / ZnO纳米棒基传感器的乙醇气体感测特性。实验结果表明，基于PbS QDs / ZnO纳米棒的传感器具有高响应，短响应和恢复时间以及良好的重复性，并发现了最佳的PbS QDs SILAR循环可实现最佳的乙醇气体感测性能。基于PbS QDs / ZnO纳米棒的传感器的可能的传感机制归因于多孔的花状形态，异质结纳米结构和高比例的气体扩散位点。