Liu Yinzhong, Wei Xiaoshun, Guo Yun, Wang Lingchao, Guo Hui, Wang Qingjie, Qiao Yiyu, Zhu Xiaotao, Yang Xuechun, Cheng Lingli, Jiao Zheng
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
Key Laboratory of Organic Compound Pollution Control Engineering, Ministry of Education, Shanghai University, Shanghai 200444, China.
Sensors (Basel). 2025 Jul 18;25(14):4480. doi: 10.3390/s25144480.
Volatile organic compounds (VOCs) are presently posing a rather considerable threat to both human health and environmental sustainability. Among these, n-butanol is commonly identified as bringing potential hazards to environmental integrity and individual health. This study presents the creation of a highly sensitive n-butanol gas sensor utilizing cobalt-doped zinc oxide (ZnO) derived from a metal-organic framework (MOF). A series of x-Co/MOF-ZnO (x = 1, 3, 5, 7 wt%) nanomaterials with varying Co ratios were generated using the homogeneous co-precipitation method and assessed for their gas-sensing performances under a low operating temperature (191 °C) and UV excitation (220 mW/cm). These findings demonstrated that the 5-Co/MOF-ZnO sensor presented the highest oxygen vacancy (O) concentration and the largest specific surface area (SSA), representing the optimal reactivity, selectivity, and durability for n-butanol detection. Regarding the sensor's response to 100 ppm n-butanol under UV excitation, it achieved a value of 1259.06, 9.80 times greater than that of pure MOF-ZnO (128.56) and 2.07 times higher than that in darkness (608.38). Additionally, under UV illumination, the sensor achieved a rapid response time (11 s) and recovery rate (23 s). As a strategy to transform the functionality of ZnO-based sensors for n-butanol gas detection, this study also investigated potential possible redox reactions occurring during the detection process.
挥发性有机化合物（VOCs）目前对人类健康和环境可持续性构成了相当大的威胁。其中，正丁醇通常被认为会对环境完整性和个人健康带来潜在危害。本研究展示了一种利用源自金属有机框架（MOF）的钴掺杂氧化锌（ZnO）创建的高灵敏度正丁醇气体传感器。采用均匀共沉淀法制备了一系列具有不同钴比例的x-Co/MOF-ZnO（x = 1、3、5、7 wt%）纳米材料，并在低工作温度（191°C）和紫外线激发（220 mW/cm）下评估了它们的气敏性能。这些结果表明，5-Co/MOF-ZnO传感器具有最高的氧空位（O）浓度和最大的比表面积（SSA），在正丁醇检测方面表现出最佳的反应活性、选择性和耐久性。关于该传感器在紫外线激发下对100 ppm正丁醇的响应，其值达到1259.06，比纯MOF-ZnO（128.56）高9.80倍，比在黑暗中（608.38）高2.07倍。此外，在紫外线照射下，该传感器实现了快速的响应时间（11秒）和恢复率（23秒）。作为一种改变基于ZnO的传感器用于正丁醇气体检测功能的策略，本研究还研究了检测过程中可能发生的潜在氧化还原反应。
