title: UV luminescent organic-capped ZnO quantum dots synthesized by alkoxide hydrolysis with dilute water.
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.
authors.affiliation: Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan. omata@mat.eng.osaka-u.ac.jp
authors.forename: Takahisa
authors.initials: T
authors.lastname: Omata
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Takahashi
authors.forename: Shinichi
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Maeda
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Nose
authors.forename: Shinya
authors.initials: S
authors.lastname: Otsuka-Yao-Matsuo
authors.forename: Kenji
authors.initials: K
authors.lastname: Kanaori
mesh_terms: D001709:Biotechnology / Q000379:methods*; D003102:Colloids / Q000138:chemical synthesis*; D003890:Desiccation; D006358:Hot Temperature; D006868:Hydrolysis; D049449:Luminescence; D015335:Molecular Probes / Q000138:chemical synthesis*; D010316:Particle Size; D058105:Polymerization; D045663:Quantum Dots; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D003102:Colloids; D015335:Molecular Probes; D014867:Water; D015034:Zinc Oxide