In this work, we demonstrate that solution-processed In₂Se₃ nanosheets exhibit exceptional selectivity and sensitivity to NO₂ gas, making them a promising candidate for gas detection systems. Theoretical simulations and surface-science experiments reveal the unique surface properties of In₂Se₃ nanosheets, which prevent physisorption of oxygen, carbon monoxide, and carbon dioxide, making them remarkably stable towards oxidation and CO-poisoning. Moreover, we show that NO₂ molecules adsorb stably on In₂Se₃ nanosheets, particularly on Se vacancies, even at high temperatures. The coadsorption of water further enhances NO₂ sticking on the In₂Se₃ surface, making it an ideal material for gas sensing applications in humid and harsh environments. The fabricated In₂Se₃ gas sensors exhibit excellent and reversible sensing response to NO₂ gas, with a limit of detection of 5 ppb at 300 °C, and a highly selective response to NO₂ compared to other gases and volatile organic compounds. Our sensors outperform other two-dimensional (2D) semiconductors, metal oxides, and their heterostructures, thanks to the unique surface properties of In₂Se₃ nanosheets. Importantly, the number of layers and termination of the surface almost have no impact on the sensing performance of In₂Se₃, which is advantageous for practical applications. The high sensitivity, selectivity, and stability of In₂Se₃ nanosheets make them an exciting platform for the fabrication of high-performance gas sensors, particularly in harsh environments, such as industrial settings or outdoor monitoring. Moreover, our solution processing approach enables scalable production of the sensors. Additionally, their unique surface properties make them an attractive candidate for developing complex composite nanostructures with tailored gas sensing characteristics for various applications.

中文翻译：

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用于超灵敏和高选择性 NO2 气体传感器的溶液处理 In2Se3 纳米片

在这项工作中，我们展示了溶液处理的 In ₂ Se ₃纳米片对 NO ₂气体表现出卓越的选择性和敏感性，使其成为气体检测系统的有前途的候选者。_{理论模拟和表面科学实验揭示了 In 2} Se ₃纳米片的独特表面特性，可防止氧气、一氧化碳和二氧化碳的物理吸附，使其对氧化和一氧化碳中毒非常稳定。此外，我们表明即使在高温下， NO ₂分子也能稳定地吸附在 In ₂ Se _{3纳米片上，尤其是在 Se 空位上。}水的共吸附进一步增强了NO ₂粘附在 In ₂ Se ₃表面，使其成为潮湿和恶劣环境中气体传感应用的理想材料。制造的 In ₂ Se _{3气体传感器对 NO 2}气体表现出出色的可逆传感响应，在 300 °C 下检测限为 5 ppb，与其他气体和挥发性有机化合物相比，对 NO _{2的响应具有高选择性。由于 In 2} Se ₃的独特表面特性，我们的传感器优于其他二维 (2D) 半导体、金属氧化物及其异质结构纳米片。重要的是，层数和表面终止对In ₂ Se ₃的传感性能几乎没有影响，这有利于实际应用。_{In 2} Se ₃纳米片的高灵敏度、选择性和稳定性使其成为制造高性能气体传感器的令人兴奋的平台，特别是在工业环境或室外监测等恶劣环境中。此外，我们的解决方案处理方法可实现传感器的可扩展生产。此外，它们独特的表面特性使它们成为开发具有针对各种应用的定制气体传感特性的复杂复合纳米结构的有吸引力的候选者。