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  • Title: UV luminescent organic-capped ZnO quantum dots synthesized by alkoxide hydrolysis with dilute water.
    Author: Omata T, Takahashi K, Hashimoto S, Maeda Y, Nose K, Otsuka-Yao-Matsuo S, Kanaori K.
    Journal: J Colloid Interface Sci; 2011 Mar 15; 355(2):274-81. PubMed ID: 21215412.
    Abstract:
    A novel synthesis route to organic-capped and colloidal ZnO quantum dots (QDs) has been developed. Specifically, zinc-di-t-butoxide and zinc-di-n-butoxide are hydrolyzed by very dilute water (400-600 mass ppm) in hydrophilic benzylamine and polymerized to ZnO by dehydration and/or a butanol elimination reaction. Growth of the ZnO QDs and exchange of the surface capping ligand from the hydroxyl groups and/or benzylamine to the oleylamine occur by heating the colloidal solution after addition of the oleylamine at 100-180°C. The final ZnO QDs with diameters in the range of 3-7 nm are highly dispersible in various organic solvents. The ZnO QDs exhibit the quantum size effect upon UV emission; it was controlled between 3.39 and 3.54 eV in the present study. The defect-related Vis emission decreased and the UV emission becomes dominant when zinc-di-n-butoxide with a 99.99% zinc purity is used as the starting material. The intensity of the photoluminescence UV emission is 1.5 times higher than that of the Vis emission.
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