Abstract

Fe-doped ZnO (Fe–ZnO) mesoporous nanoparticles have been synthesized via a facile hydrothermal method, which utilizes pluronic triblock copolymer polyethylene glycol–polypropylene glycol–polyethylene glycol (PEO-PPO-PEO) as the pore-forming agent. Fe–ZnO composites have an unique porous structure. Their pore sizes increase with Fe-doping concentration and reach a maximum as Fe concentration is 15 at.%; the specific surface area of synthesized mesoporous Fe–ZnO nanoparticles reaches a maximum as the Fe concentration is about 11 at.%. Electron microscopy, vapor pressure isotherm measurements and photoluminescence (PL) were used to characterize synthesized Fe–ZnO composites. Fe–ZnO-based gas sensors exhibit excellent response in detecting ethanol; the sensing response of Fe(11 at.%)–ZnO reaches 319.8, which is significantly higher than most of the ZnO-based gaseous sensors. The improved sensitivity is ascribed to the increase of oxygen-related defects and specific surface area of Fe–ZnO composites.

中文翻译：

---

最佳Fe-ZnO介孔纳米粒子的乙醇气敏特性改善

摘要

掺铁的ZnO（Fe–ZnO）介孔纳米粒子是通过简便的水热方法合成的，该方法利用普朗尼克三嵌段共聚物聚乙二醇–聚丙二醇–聚乙二醇（PEO-PPO-PEO）作为成孔剂。Fe-ZnO复合材料具有独特的多孔结构。它们的孔径随Fe掺杂浓度的增加而增加，并在Fe浓度为15 at。％时达到最大值。当Fe浓度约为11 at。％时，合成的中孔Fe-ZnO纳米粒子的比表面积达到最大值。电子显微镜，蒸气压等温线测量和光致发光（PL）用于表征合成的Fe–ZnO复合材料。基于Fe–ZnO的气体传感器在检测乙醇中表现出出色的响应；Fe（11 at。％）– ZnO的传感响应达到319.8，远高于大多数基于ZnO的气态传感器。灵敏度的提高归因于与氧有关的缺陷和Fe-ZnO复合材料比表面积的增加。