MOF template catalysts derived dual heterojunction sensitization: PdO@ZnWO4–WO3 composite nanofibers with enhanced acetone sensing properties

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-12-13 DOI:10.1016/j.jallcom.2024.178086

Jie Sun, Yulin Tao, Jinniu Zhang, Jianzhi Gao, Hongbing Lu, Yaojie Sun

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Abstract

The construction of multiple effective heterostructures and the catalytic effects of noble metal catalysts can significantly enhance the sensing response, accelerate response and recovery rates, and reduce the operating temperature of metal oxide-based gas sensors. In this study, metal–organic framework (MOF)-derived PdO@ZnWO₄–WO₃ (PZW) dual heterojunction nanofibers (NFs) were constructed using Pd@ZIF-8 as a novel catalyst loading platform to effectively sensitize porous WO₃ NFs. The PZW-2 NFs prepared with an optimal volume of 2.0 mL Pd@ZIF-8 solution possessed enhanced resistance modulation capacity and reduced sensing reaction activation energy. Consequently, the PZW-2 NFs demonstrated excellent sensing properties characterized by high acetone responses (R_a/R_g = 24.6 to 20 ppm) and short response/recovery times (4 s/6 s). The PZW-2 NFs also exhibited good selectivity and stability towards acetone. These improved sensing performances were attributed to the synergistic interactions in several aspects, including the generation of dual heterojunctions, the catalytic effects of PdO nanoparticles, and the unique porous nanofiber structure with a high specific surface area. This work provides a new strategy to fabricate noble metal@MOF-derived dual heterojunction NFs with high gas-sensing performances.

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MOF模板催化剂衍生的双异质结敏化：PdO@ZnWO4 -WO3复合纳米纤维与增强的丙酮传感性能

多种有效异质结构的构建和贵金属催化剂的催化作用可以显著增强传感响应，加快响应和回收率，降低金属氧化物基气体传感器的工作温度。在本研究中，以Pd@ZIF-8作为新型催化剂负载平台，构建了金属有机骨架（MOF）衍生的PdO@ZnWO4 -WO3 （PZW）双异质结纳米纤维（NFs），以有效敏化多孔WO3 NFs。以2.0 mL Pd@ZIF-8溶液为最优体积制备的PZW-2 NFs具有增强的电阻调制能力和降低的感应反应活化能。结果表明，PZW-2 NFs具有高的丙酮响应（Ra/Rg = 24.6 ~ 20 ppm）和短的响应/恢复时间（4 s/6 s），对丙酮具有良好的选择性和稳定性。这些改进的传感性能归因于几个方面的协同作用，包括双异质结的产生，PdO纳米颗粒的催化作用，以及具有高比表面积的独特多孔纳米纤维结构。本工作为制备具有高气敏性能的metal@MOF-derived双异质结NFs提供了新策略。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.