DOI: https://doi.org/10.29363/nanoge.incnc.2021.036
Publication date: 8th June 2021
Surface ligands affect many properties of colloidal nanocrystals, including solubility, reactivity, and electronic structure. Therefore, unveiling their nature is crucial to design and control nanocrystal properties. Here, we investigated the synthesis of metal oxide nanocrystals by heating up metal nitrates in the presence of oleylamine as the only surfactant. Based on the precursor choice, the expected ligand in these syntheses is oleylamine. However, we found that the ligand shell of the so-produced CeO2 nanocrystals is only comprised of oleic acid, even though it is not added to the reaction. Thorough characterization with NMR spectroscopy of the particles before and after purification unveiled how oleic acid is formed, and we proposed a reaction path for the oxidation of oleylamine. We further showed that NiO, CoO, and ZnO prepared from nitrates and amines are also capped exclusively by carboxylic acids. Our findings reaffirm the importance of studying the nanocrystals surface chemistry, as one cannot assume that the ligands on the surface are the starting ones.
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