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

Sujee Cho, Chungseong Park, Mingyu Jeon, Jae Hwa Lee, Ohmin Kwon, Seoyeon Seong, Jihan Kim, Il Doo Kim, Hoi Ri Moon

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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 functionally (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 synergetically enhanced sensing performances toward toxic H2S gas with the lowest recorded limit of detection (1.4 ppb), superior sensitivity (ΔR/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.

Original languageEnglish
Article number137780
JournalChemical Engineering Journal
StatePublished - 1 Dec 2022

Bibliographical note

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© 2022 Elsevier B.V.


  • Chemiresistive sensing
  • Conductive MOF
  • HS detection
  • Interface
  • MOF@MOF heterostructure


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