In recent years, carbon monoxide (CO) intoxication incidents occur frequently, and the sensitive detection of CO is particularly significant. At present, most reported carbon monoxide (CO) sensors meet the disadvantage of high working temperature. It is always a challenge to realize the sensitive detection of carbon monoxide at room temperature. In this study, CuO nanosheets exposed more (111) active crystal facets and oxygen vacancy defects were synthesized by a simple and environmentally friendly one-step hydrothermal method. The sensor has good comprehensive gas sensing performance, compared with other sensors that can detect CO at room temperature. The response value to 100 ppm CO at room temperature is as high as 39.6. In addition, it also has excellent selectivity, low detection limit (100 ppb), good reproducibility, moisture resistance and long-term stability (60 days). This excellent gas sensing performance is attributed to the special structural characteristics of 2D materials and the synergistic effect of more active crystal facets exposed on the crystal surface and oxygen vacancy defects. Therefore, it is expected to become a promising sensitive material for rapid and accurate detection of trace CO gas under low energy consumption, reduce the risk of poisoning, and then effectively protect human life safety.

近年来，一氧化碳（CO）中毒事件频发，CO的灵敏检测尤为重要。目前，大多数报道的一氧化碳（CO）传感器都存在工作温度高的缺点。在室温下实现一氧化碳的灵敏检测一直是一个挑战。在这项研究中，通过简单且环保的一步水热法合成了暴露更多（111）活性晶面和氧空位缺陷的CuO纳米片。与其他可在室温下检测CO的传感器相比，该传感器具有良好的综合气体传感性能。室温下对 100 ppm CO 的响应值高达 39.6。此外，它还具有优异的选择性、低检测限（100 ppb）、良好的重现性、防潮性和长期稳定性（60天）。这种优异的气敏性能归因于二维材料的特殊结构特性以及暴露在晶体表面的更多活性晶面和氧空位缺陷的协同作用。因此，有望成为低能耗下快速准确检测痕量CO气体，降低中毒风险，进而有效保障人类生命安全的一种很有前景的敏感材料。