Honors College Thesis
 

UV-assisted lipoic acid ligand exchange of copper indium disulfide-zinc sulfide core-shell quantum dots

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https://ir.library.oregonstate.edu/concern/honors_college_theses/7m01bn628

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  • Water-soluble quantum dots obtained through ligand exchange are widely applicable for biological imaging and marking, LEDs, and photovoltaics. Lipoic acid (LA) was reduced to dihydrolipoic acid (DHLA) using 365-nm soft UV light in a process known as photoligation, and ligand exchange with dodecanethiol-capped CuInS₂-ZnS core-shell quantum dots occurred. The reaction was allowed to proceed 24-48 hours when using 50 mM LA in methanol and quantum dots dissolved in hexane. Reaction success was confirmed by continued solubility of quantum dots in methanol following high-speed centrifugation. The product was characterized using UV-visible spectroscopy, photoluminescence, and Raman spectroscopy. Quantum yield decreased from approximately 25% to 3% and a small red shift in peak location was observed after ligand exchange. The process described shows great promise for producing water-soluble quantum dots. Functionalization and end uses can be explored following additional experiments to improve water solubility and quantum yield.
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