One-dimensional hollow porous Ru–CuO nanofibers covered with ZIF-71 for H2S gas sensing and its first-principle study

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-09-06 DOI:10.1007/s12598-024-02977-2

Chang-Kun Qiu, Lin Wang, Fei An, Hao Zhang, Qing-Run Li, Hao-Zhi Wang, Ming-Jun Li, Jing-Yu Guo, Pei-Lin Jia, Zong-Wei Liu, Liang Zhu, Wei Xu, Dong-Zhi Zhang

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Abstract

Based on the unique catalytic properties of precious metals, the introduction of precious metals into metal oxide semiconductors will greatly improve the gas-sensitive properties of materials. As a new type of porous material, metal–organic frameworks (MOF) can be used for gas separation and adsorption due to their adjustable pore size and acceptable thermal stability. In this work, the ZIF-71 MOF was synthesized on CuO nanofibers doped with different concentrations of Ru to form a Ru–CuO@ZIF-71 nanocomposite sensor, which was then used for H₂S detection. The sensor shows sensitivity to trace amounts of H₂S gas (100 ppb), and the response is greatly enhanced at the optimal Ru doping ratio and operating temperature. The introduction of the ZIF-71 membrane can significantly increase the selectivity of the sensor while further improving the sensitivity. Finally, the possible sensing mechanism of the Ru–CuO@ZIF-71 sensor was explored. The enhancement of the H₂S gas sensing properties may be attributed to the catalysis of Ru and the formation of the Schottky junction at the Ru–CuO interface. Besides, the calculation based on density functional theory reveals enhanced adsorption capacities of CuO for H₂S after Ru doping. Therefore, the Ru–CuO@ZIF-71 sensor has strong application potential in exhaled gas detection and portable detection of H₂S gas in industrial environments.

Graphical abstract

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用于 H2S 气体传感的 ZIF-71 覆盖层一维中空多孔 Ru-CuO 纳米纤维及其第一原理研究

基于贵金属独特的催化特性，在金属氧化物半导体中引入贵金属将大大改善材料的气敏特性。作为一种新型多孔材料，金属有机框架（MOF）具有可调节的孔径和可接受的热稳定性，可用于气体分离和吸附。在这项工作中，在掺入不同浓度 Ru 的 CuO 纳米纤维上合成了 ZIF-71 MOF，形成了 Ru-CuO@ZIF-71 纳米复合传感器，并将其用于 H2S 检测。该传感器对痕量 H2S 气体（100 ppb）具有灵敏度，在最佳 Ru 掺杂比例和工作温度下，其响应大大增强。ZIF-71 膜的引入可以显著提高传感器的选择性，同时进一步提高灵敏度。最后，探讨了 Ru-CuO@ZIF-71 传感器可能的传感机制。H2S 气体传感性能的增强可能归因于 Ru 的催化作用和 Ru-CuO 界面肖特基结的形成。此外，基于密度泛函理论的计算显示，掺杂 Ru 后 CuO 对 H2S 的吸附能力增强。因此，Ru-CuO@ZIF-71 传感器在呼出气体检测和工业环境中 H2S 气体的便携式检测方面具有很强的应用潜力。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.