Transition metal dichalcogenides (TMDCs)/metal oxides are increasingly recognized as competitive sensing materials for detection at room temperature (RT). However, their unsatisfactory properties caused by low sensitivity, slow response, and weak discriminating ability towards interfering gases preclude their further applications in advanced sensing platforms. Herein, a Bi₂S₃/CuO heterostructure was demonstrated for H₂S detection with a highly sensitive rapid response at RT. The Bi₂S₃/CuO sensor exhibited a greatly improved response (31.2 to 1 ppm H₂S) with impressive response kinetics (7.5 s), surpassing that of pure Bi₂S₃ by a factor of 5 and 17, respectively. Besides, the sensor exhibits outstanding selectivity, repeatability, low detection limit (25 ppb), humidity tolerance and long-term stability. The distinctive enhancement of sensing capabilities primarily results from the synergistic influence of the heterostructure configuration and increased surface-adsorbed oxygen. This strategy of constructing heterostructures between a metal oxide and TMDC provides fundamental insights for developing room-temperature sensors.

中文翻译：

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基于 Bi2S3/CuO 异质结构的快速室温 H2S 检测：增加的表面吸附氧和异质结效应的协同作用


过渡金属硫化物 （TMDC）/金属氧化物越来越被认为是在室温 （RT） 下检测的有竞争力的传感材料。然而，由于灵敏度低、响应慢和对干扰气体的鉴别能力弱，其性能不令人满意，因此无法在高级传感平台中进一步应用。在此，证明了 Bi ₂ S ₃ /CuO 异质结构用于 H ₂ S 检测，在 RT 下具有高度敏感的快速响应。Bi ₂ S ₃ /CuO 传感器表现出大大改善的响应（31.2 至 1 ppm H ₂ S）和令人印象深刻的响应动力学 （7.5 s），分别比纯 Bi ₂ S ₃ 高出 5 倍和 17 倍。此外，该传感器还具有出色的选择性、可重复性、低检出限 （25 ppb）、耐湿性和长期稳定性。传感能力的独特增强主要是由于异质结构构型和表面吸附氧的增加的协同作用。这种在金属氧化物和 TMDC 之间构建异质结构的策略为开发室温传感器提供了基础见解。