Detection of Ammonia Using ZnCo₂O₄/Co₃O₄ Hollow Nanocages

氨是一种常见的空气污染物，同时也是人体呼出气体中的重要成分，在多个领域中具有广泛应用。因此，开发一款能够在室温下工作的高灵敏氨气传感器对于工业安全和人类健康监控至关重要。本研究采用MOF模板法，通过快速煅烧Zn/ZIF-67前驱体成功制备了具有中空纳米笼结构的ZnCo2O4/Co3O4混合金属氧化物。通过SEM、TEM、XRD和XPS手段对该材料结构、组成和形貌进行了表征。所制备的传感器在1~100 ppm氨气浓度范围内表现出良好的响应性能，随着氨气浓度的增加，传感器的响应度逐渐增大，在50 ppm时响应度达到26%，响应和恢复时间分别为15秒和70秒，且在室温下能够重复使用，显示出良好的稳定性。该研究为室温下高效实时检测氨气提供了有效的解决方案，并有望在实际应用中发挥重要作用。Ammonia is a common air pollutant and also an important component of human exhaled gases, with wide applications in various fields. Therefore, the development of a highly sensitive ammonia sensor capable of operating at room temperature is crucial for industrial safety and human health monitoring. In this study, the MOF template method was adopted, and a mixed metal oxide of ZnCo2O4/Co3O4 with a hollow nanocage structure was successfully prepared by rapidly calcining the Zn/ZIF-67 precursor. The structure, composition, and morphology of this material were characterized using SEM, TEM, XRD, and XPS. The prepared sensor exhibited good response performance within the ammonia concentration range of 1~100 ppm. As the ammonia concentration increased, the response of the sensor gradually increased. The response reached 26% at 50 ppm, with the response time and recovery time being 15 seconds and 70 seconds, respectively. Moreover, it could be reused at room temperature, demonstrating good stability. This study provides an effective solution for the efficient and real-time detection of ammonia at room temperature and is expected to play an important role in practical applications.