Graduate Thesis Or Dissertation
 

Synthesis of Plasmonic-Enhanced Metal-Organic Framework Thin Films and their Infrared Sensing Application

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8p58ph587

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  • Transparent and electrically conductive metal oxide nanoparticles have attracted much attention, and can be used to improve the performance of solar cells, transparent electrode materials, and gas sensor technology. Specifically, indium tin oxide (ITO) nanocrystals (NCs) are potentially useful nanomaterials, having technological applications in enhanced sensitivity of optical spectroscopy due to their localized surface plasmon resonance (LSPR). Metal organic frameworks (MOFs) are a class of novel inorganic-organic hybrid materials with varied structure and tunable functions that award MOFs high capability of gas absorption. In this research we combine ITO NCs with highly porous Cu-BTC MOF in a sandwich-structured thin film with an end-goal to enhance the IR absorption of CO₂ in the NIR range. High quality mono-dispersed organic-ligand-capped colloidal ITO NCs are synthesized. The hydrophobic capping agents stabilize the NCs in nonpolar solvents and prevent their aggregation, but are not propitious for Cu-BTC MOF growing on the surface. The capping reagent were modified from a hydrophobic to a hydrophilic by using 3-Aminopropyl triethoxysilane (APTES) which provide an -NH₂ terminated functional group that allows for the growth of MOF crystals. Based on (3-Aminopropyl)triethoxysilane (APTES) capped ITO (APTES-ITO), a sandwich-structured film made by APTES-ITO films and Cu-BTC MOF films was fabricated on glass. The sensing capability of CO₂ was measured in the NIR range. No enhancement of signal intensity was observed. Several reasons were suggested for the no enhancement of IR absorption including the presence of water; the presence of surface ligands on ITO NCs; and the non-optimum gas cell design.
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