Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.445
Publication date: 16th December 2024
Metal-organic liquids represent an emerging class of functional materials that combine the unique properties of coordination polymers with the versatility of liquid-state materials. In this work, we present the synthesis and comprehensive characterization of three novel copper-based MOLs and one silver-based MOL, all exhibiting melting temperatures below 100°C. These materials share the same [Cu] backbone structure but achieve different dimensionalities (1D, 2D, and 3D) through variation of the counter-cation, providing an unprecedented opportunity to correlate structural dimensionality with physical-chemical properties. Through detailed thermal analysis, we demonstrate glass transition temperatures ranging from -42°C to -21°C and melting points between 48°C and 88°C. Temperature-dependent Raman spectroscopy reveals the structural evolution during the solid-to-liquid transition, while computational modeling provides insights into the electronic band structures and charge transport mechanisms. The materials exhibit conductivities ranging from 10-10 to 10-6 S cm-1, with dimensionality playing a crucial role in determining transport properties. We demonstrate the practical application of these materials as hole transport materials in dye-sensitized solar cells (DSSCs) without requiring electrolyte additives. The materials' versatility is showcased through successful implementation in three different states - liquid, gel-like, and quasi-solid - offering flexible processing options for device fabrication. This work not only advances the fundamental understanding of metal organic liquids properties and phase transitions but also establishes their potential as multifunctional materials for energy applications.
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