Topologically Tunable Conjugated Metal–Organic Frameworks for Modulating Conductivity and Chemiresistive Properties for NH₃ Sensing

Abstract

Electrically conductive metal‐organic frameworks (cMOFs) have garnered significant attention in materials science due to their potential applications in modern electrical devices. However, achieving effective modulation of their conductivity has proven to be a major challenge. In this study, we have successfully prepared cMOFs with high conductivity by incorporating electron‐donating fused thiophen rings in the frameworks and extending their π‐conjugated systems through ring‐closing reactions. The conductivity of cMOFs can be precisely modulated ranging from 10‐3 to 102 S m‐1 by regulating their dimensions and topologies. Furthermore, leveraging the inherent tunable electrical properties based on topology, we successfully demonstrated the potential of these materials as chemiresistive gas sensors with an outstanding response toward 100 ppm NH3 at room temperature. This work not only provides valuable insights into the design of functional cMOFs with different topologies but also enriches the cMOF family with exceptional conductivity properties.

Exploring affinity between organic probes and Prussian Blue Analogues via inverse gas chromatography

“…Metal–organic Frameworks (MOFs) represent a major category of coordination polymers, which includes Prussian Blue Analogues (PBAs) as a distinctive subclass 23 . While MOFs have been extensively studied in the fields of catalysis and gas detection across various target analytes, particularly under RT conditions 24 , 25 , most PBA studies investigate their redox properties 26 within the fields of energy storage, electrocatalysis, and capacitive deionization 27 , 28 . Given their facile, scalable synthesis as well as their ease of integration with sensing devices 23 , 29 , the potential of PBAs for the purpose of gas sensing is far reaching.…”