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Isomeric Dual-Pore Two-Dimensional Covalent Organic Frameworks.

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Researchers synthesized novel two-dimensional (2D) covalent organic frameworks (COFs) with a kagome (kgm) topology. The azulene-based COF exhibits a record-low band gap and superior performance in NO2 gas sensing.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Two-dimensional (2D) covalent organic frameworks (COFs) with hierarchical porosity are promising materials.
  • 2D COFs with kagome (kgm) topology offer unique optoelectronic properties but are challenging to synthesize.
  • Competition with square-lattice topology hinders kgm COF synthesis.

Purpose of the Study:

  • To develop a novel geometric strategy for synthesizing dual-pore 2D COFs with kgm topology.
  • To investigate the structure-property correlations of these COFs, particularly focusing on the effect of isomeric building blocks.
  • To explore the potential of these COFs as electrode materials for gas sensing applications.

Main Methods:

  • Utilized a novel geometric strategy employing four-armed naphthalene-based and azulene-based isomeric monomers.
  • Synthesized two isomeric dual-pore 2D COFs with kgm topology.
  • Characterized the COFs and evaluated the azulene-based COF (COF-Az) as an electrode material in a gas sensor for NO2 detection.

Main Results:

  • Successfully synthesized two isomeric dual-pore 2D COFs with kgm topology.
  • The azulene-based COF (COF-Az) exhibited a narrow band gap of 1.37 eV, the lowest among reported imine-linked dual-pore 2D COFs.
  • COF-Az demonstrated high selectivity for NO2, with a 58.7% response rate (10 ppm NO2), fast recovery (72 s), 10-week stability, and 80% humidity resistance.

Conclusions:

  • The novel geometric strategy enables the synthesis of 2D COFs with isometric kgm topology.
  • The large dipole moment of azulene significantly enhances the sensitivity of imine linkages, boosting gas sensor performance.
  • Azulene-based 2D COFs provide a promising platform for studying structure-property relationships and developing advanced gas sensors.