Rapid room-temperature H2S detection based on Bi2S3/CuO heterostructures: the synergy of increased surface-adsorbed oxygen and heterojunction effect

IF 6.1 1区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Frontiers Pub Date : 2024-11-25 DOI:10.1039/d4qi01542h

Chengcheng Hu, Meiling Yu, Zhenze Zhou, Chenda Wei, You Wang, Juanyuan Hao

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Abstract

Transition metal dichalcogenides (TMDCs)/metal oxide are increasing recognized as competitive sensing materials to detect at room temperature (RT). However, the unsatisfactory properties causing 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 highly sensitive and rapidly responding 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. The strategy of constructing heterostructures between a metal oxide and TMDC offers fundamental insights to develop room-temperature sensors.

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基于 Bi2S3/CuO 异质结构的室温 H2S 快速检测：表面吸附氧增加与异质结效应的协同作用

过渡金属二卤化物（TMDCs）/金属氧化物越来越多地被认为是具有竞争力的室温（RT）检测传感材料。然而，由于其灵敏度低、响应速度慢、对干扰气体的分辨能力弱等不尽如人意的特性，使其无法进一步应用于先进的传感平台。在此，我们展示了一种 Bi2S3/CuO 异质结构，用于 H2S 检测，在 RT 条件下具有高灵敏度和快速响应能力。Bi2S3/CuO 传感器的响应速度（31.2 至 1 ppm H2S）大大提高，响应动力学（7.5 秒）令人印象深刻，分别比纯 Bi2S3 传感器高出 5 倍和 17 倍。此外，该传感器还具有出色的选择性、可重复性、低检测限（25 ppb）、耐湿性和长期稳定性。传感能力的显著增强主要源于异质结构配置和表面吸附氧增加的协同影响。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本启示。

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