Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.174
Publication date: 16th December 2024
Metal-Organic Frameworks (MOFs) are crystalline, porous materials composed of metal or metal clusters bonded by polytopic organic ligands.1 These materials possess unique physicochemical properties, making them attractive for various applications such as gas storage/separation, catalysis, drug delivery, chemical sensing, and water treatment.2 On the other hand, plasmonic nanoparticles exhibit unique optical properties, including Localized Surface Plasmon Resonance (LSPR), which make them suitable for applications such as catalysis, sensing, and heating.3,4
Combining these two distinct materials presents challenges due to the functionalization of the nanoparticle core, which must fulfill two roles: adapting the nanoparticles to the high-temperature and high-pressure conditions typically required for MOF synthesis, and promoting the controlled growth of MOFs onto the cores.
However, there are limited reports in the literature regarding the growth of Zr-based MOFs, such as the UiO family, on plasmonic nanoparticles. This is primarily due to the propensity of high temperatures and long reaction times to cause reshaping or complete dissolution of the nanoparticles, resulting in either etching or undesirable changes in optical properties.
In this study, we developed synthetic methodologies aimed at preventing reshaping and etching during the synthesis of nanocomposites comprising Zr-based MOFs and Au nanoparticles functionalized with polyethylene glycol. These nanocomposites exhibit absorption around 800 nm and maintain their infrared absorption properties even at lower synthesis temperatures, thereby increasing reaction yields. Additionally, the nanocomposites demonstrate colloidal stability and have been extensively characterized.
Our findings not only provide insights into overcoming challenges associated with MOF-plasmonic nanoparticle composites but also offer a foundation for the development of stable and functional nanomaterials suitable for a wide range of applications.5
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