Interface-Sensitized Chemiresistor: Integrated Conductive and Porous Metal-Organic Frameworks

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Research to develop ideal sensing devices for toxic gases is on the rise, and amongst various materials, metal--organic frameworks (MOFs) have opened up promising vistas as chemiresistive sensors due to their high structural and functional tunability. Here, we report the composites of dimensionally (2D and 3D) and func-tionally (conductive and porous) different two MOFs in the form of a well-integrated core-shell structure. The hierarchically assembled 2D-MOF@3D-MOF exhibits new interfacial properties that are responsible for syn-ergetically enhanced sensing performances toward toxic H2S gas with the lowest recorded limit of detection (1.4 ppb), superior sensitivity (& UDelta;R/R0 = 3.37), and outstanding selectivity at room temperature in air. The sensing mechanisms are proposed by combinational studies of experiments and calculation, which indicates that multiple changes (e.g., local structural change of the shell MOF, secondary binding sites generation from the core MOF, and free radicals formation) play a critical role in achieving synergetic chemiresistive sensing.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2022-12
Language
English
Article Type
Article
Citation

CHEMICAL ENGINEERING JOURNAL, v.449

ISSN
1385-8947
DOI
10.1016/j.cej.2022.137780
URI
http://hdl.handle.net/10203/297449
Appears in Collection
CBE-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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