Laboratorio de Investigación y Posgrado en Tecnología Farmacéutica, Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Av. 1o. de Mayo S/N, Cuautitlán Izcalli, Estado de Mexico 54740, Mexico.
Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Ave. Eugenio Garza Sada 2501, Monterrey, Nuevo León 64849, Mexico.
Sensors (Basel). 2021 Jun 28;21(13):4425. doi: 10.3390/s21134425.
Monitoring and detecting carbon monoxide (CO) are critical because this gas is toxic and harmful to the ecosystem. In this respect, designing high-performance gas sensors for CO detection is necessary. Zinc oxide-based materials are promising for use as CO sensors, owing to their good sensing response, electrical performance, cost-effectiveness, long-term stability, low power consumption, ease of manufacturing, chemical stability, and non-toxicity. Nevertheless, further progress in gas sensing requires improving the selectivity and sensitivity, and lowering the operating temperature. Recently, different strategies have been implemented to improve the sensitivity and selectivity of ZnO to CO, highlighting the doping of ZnO. Many studies concluded that doped ZnO demonstrates better sensing properties than those of undoped ZnO in detecting CO. Therefore, in this review, we analyze and discuss, in detail, the recent advances in doped ZnO for CO sensing applications. First, experimental studies on ZnO doped with transition metals, boron group elements, and alkaline earth metals as CO sensors are comprehensively reviewed. We then focused on analyzing theoretical and combined experimental-theoretical studies. Finally, we present the conclusions and some perspectives for future investigations in the context of advancements in CO sensing using doped ZnO, which include room-temperature gas sensing.
监测和检测一氧化碳（CO）至关重要，因为这种气体对生态系统具有毒性和危害性。在这方面，设计用于 CO 检测的高性能气体传感器是必要的。氧化锌基材料因其良好的传感响应、电性能、成本效益、长期稳定性、低功耗、易于制造、化学稳定性和无毒等特性，有望用作 CO 传感器。然而，为了提高气体传感的选择性和灵敏度，并降低工作温度，气体传感还需要进一步发展。最近，已经实施了不同的策略来提高 ZnO 对 CO 的灵敏度和选择性，其中包括 ZnO 的掺杂。许多研究表明，掺杂 ZnO 在检测 CO 方面比未掺杂 ZnO 具有更好的传感性能。因此，在本综述中，我们详细分析和讨论了用于 CO 传感应用的掺杂 ZnO 的最新进展。首先，我们全面回顾了用过渡金属、硼族元素和碱土金属掺杂 ZnO 作为 CO 传感器的实验研究。然后，我们重点分析了理论和结合实验-理论研究。最后，我们提出了结论和一些关于使用掺杂 ZnO 进行 CO 传感的未来研究的观点，包括室温气体传感。
