Strategies to Improve Electrical Conductivity in Metal–Organic Frameworks: A Comparative Study

Strategies to Improve Electrical Conductivity in Metal–Organic Frameworks: A Comparative Study

February 26, 2024 | Rajat Saha, Kajal Gupta, and Carlos J. Gómez García
This review discusses strategies to improve the electrical conductivity of metal–organic frameworks (MOFs) for their application in electronic devices. MOFs, composed of inorganic and organic components, are known for their tunable porous structures and diverse applications in gas storage, catalysis, sensing, and more. However, their low electrical conductivity limits their use in electronic applications such as electrocatalysis, supercapacitors, and batteries. To address this, various strategies have been developed to enhance the electronic conduction in both intrinsically (framework-modulated) and extrinsically (guest-modulated) conducting MOFs. The review outlines the different charge transport mechanisms in MOFs, including band-like charge transport and redox hopping. It also discusses the different charge transport pathways, such as through-bond, through-layer, through-space, through-guest, and redox hopping. The review highlights the importance of selecting appropriate metal ions and organic ligands through crystal engineering to achieve high charge mobilities in MOFs. Several strategies have been developed to enhance the electrical conductivity of MOFs. These include the incorporation of redox-active ligands, the use of extended conjugated organic ligands, and the use of hard/soft donor atoms. Redox-active ligands, such as 2,5-dihydroxybenzoquinone (H₂dhbq), can facilitate electron hopping between metal ions and ligands, leading to increased conductivity. Extended conjugated organic ligands, such as triphenylene, phthalocyanine, and naphthalocyanine, can enhance charge transport through their conjugated π-electron systems. The use of hard/soft donor atoms, such as oxygen and sulfur, can improve the metal–donor atom overlap, leading to better charge transport. The review also discusses the synthesis and characterization of various conducting MOFs, including those with redox-active ligands, extended conjugated ligands, and different donor atoms. These MOFs have shown varying levels of electrical conductivity, with some exhibiting metallic conductivity. The review highlights the importance of understanding the charge transport mechanisms and the role of the dimensionality of MOFs in determining their electrical conductivity. Overall, the review provides a comprehensive overview of the strategies to improve the electrical conductivity of MOFs, emphasizing the importance of selecting appropriate metal ions and organic ligands, as well as the role of different charge transport mechanisms in achieving high conductivity in MOFs.This review discusses strategies to improve the electrical conductivity of metal–organic frameworks (MOFs) for their application in electronic devices. MOFs, composed of inorganic and organic components, are known for their tunable porous structures and diverse applications in gas storage, catalysis, sensing, and more. However, their low electrical conductivity limits their use in electronic applications such as electrocatalysis, supercapacitors, and batteries. To address this, various strategies have been developed to enhance the electronic conduction in both intrinsically (framework-modulated) and extrinsically (guest-modulated) conducting MOFs. The review outlines the different charge transport mechanisms in MOFs, including band-like charge transport and redox hopping. It also discusses the different charge transport pathways, such as through-bond, through-layer, through-space, through-guest, and redox hopping. The review highlights the importance of selecting appropriate metal ions and organic ligands through crystal engineering to achieve high charge mobilities in MOFs. Several strategies have been developed to enhance the electrical conductivity of MOFs. These include the incorporation of redox-active ligands, the use of extended conjugated organic ligands, and the use of hard/soft donor atoms. Redox-active ligands, such as 2,5-dihydroxybenzoquinone (H₂dhbq), can facilitate electron hopping between metal ions and ligands, leading to increased conductivity. Extended conjugated organic ligands, such as triphenylene, phthalocyanine, and naphthalocyanine, can enhance charge transport through their conjugated π-electron systems. The use of hard/soft donor atoms, such as oxygen and sulfur, can improve the metal–donor atom overlap, leading to better charge transport. The review also discusses the synthesis and characterization of various conducting MOFs, including those with redox-active ligands, extended conjugated ligands, and different donor atoms. These MOFs have shown varying levels of electrical conductivity, with some exhibiting metallic conductivity. The review highlights the importance of understanding the charge transport mechanisms and the role of the dimensionality of MOFs in determining their electrical conductivity. Overall, the review provides a comprehensive overview of the strategies to improve the electrical conductivity of MOFs, emphasizing the importance of selecting appropriate metal ions and organic ligands, as well as the role of different charge transport mechanisms in achieving high conductivity in MOFs.
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[slides and audio] Strategies to Improve Electrical Conductivity in Metal%E2%80%93Organic Frameworks%3A A Comparative Study