Air pollution is a global problem, which poses serious environmental concerns and health risks. In light of this, a key aspect of the challenge of managing air pollution is effective monitoring, which requires reliable high‐sensitivity sensors with strong selectivity and long‐term stability. Layered materials represent an emergent class of materials with extraordinary electronic properties and physicochemical properties, and, therefore, are a highly attractive prospect for this field. Here, such a sensor for NO₂ based on GaSe is presented. An ultrahigh sensitivity of 0.5 part per billion (p.p.b.) is achieved at room temperature, and the NO₂ selectivity ratios with respect to other likely interfering environmental gases are larger than 100. Moreover, no great degradation is observed after 10 days of air exposure. As a practical demonstration, the GaSe‐based sensors are also used to detect vehicle exhaust emission, and wearable GaSe‐based NO₂ sensors are presented and tested. Based on the results obtained in this work, it is believed that GaSe‐based sensors can be used for the detection of NO₂ in real‐world applications.

中文翻译：

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基于GaSe的高灵敏度，选择性，稳定和灵活的NO2传感器

空气污染是一个全球性问题，带来了严重的环境问题和健康风险。因此，应对空气污染挑战的一个关键方面是有效的监测，这需要可靠的，具有高选择性和长期稳定性的高灵敏度传感器。层状材料代表了新兴的一类具有非凡的电子性能和物理化学性能的材料，因此，在该领域具有很高的吸引力。在此，提出了一种基于GaSe的NO ₂传感器。室温和NO ₂达到0.5十亿分之一（ppb）的超高灵敏度相对于其他可能干扰的环境气体的选择性比大于100。此外，暴露于空气10天后未观察到严重的降解。作为实际演示，基于GaSe的传感器也可用于检测车辆废气排放，并介绍并测试了基于GaSe的可穿戴式NO ₂传感器。根据这项工作获得的结果，可以认为基于GaSe的传感器可用于现实应用中的NO ₂检测。