ZIF-67@ZnO异质复合材料对NO₂敏感性能的研究

ZIF-67@ZnO Heterocomposite for NO₂ Gas-Sensing Properties

摘要: NO₂是主要的大气污染物之一，长期暴露于一定浓度NO₂环境中会导致呼吸系统疾病，且较高浓度暴露时可能引发急性肺损伤甚至死亡。因此，开发室温下高灵敏度、低检测限的NO₂气体传感器用于实时环境污染监测和健康防护具有重要意义。本研究通过原位生长与水热反应成功制备了ZIF-67@ZnO异质结复合材料。该材料因其独特的异质结构与多孔特性显著增强了气体的表面吸附能力，优化了载流子的输运行为，所制备的传感器在0.2~50 ppmNO₂浓度范围内展现出优异的响应性能，实现室温下ppb级NO₂的高效检测，最低检测限低至200 ppb，响应值达1.2。在环境监测、医疗卫生、食品安全领域具有广泛应用，为人类健康和环境保护迈出实践性的一步。

Abstract: NO₂ is one of the major air pollutants, and prolonged exposure to NO₂ at certain concentrations can cause respiratory diseases, while exposure to high concentrations may even result in acute lung injury or death. Therefore, the development of highly sensitive NO₂ gas sensors with low detection limits at room temperature is of great significance for real-time environmental monitoring and human health protection. In this work, a ZIF-67@ZnO heterojunction composite was successfully synthesized via in situ growth combined with a hydrothermal method. Benefiting from its unique heterostructure and porous features, the composite exhibited enhanced gas adsorption capability and improved carrier transport behavior. The as-fabricated sensor showed excellent sensing performance toward NO₂ in the concentration range of 0.2~50 ppm, enabling efficient ppb-level detection at room temperature. In particular, the sensor achieved a low detection limit of 200 ppb with a response value of 1.2. These results indicate that the ZIF-67@ZnO-based sensor holds great promise for applications in environmental monitoring, healthcare, and food safety, and offers a practical approach for protecting human health and the environment.