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Synthesis of Organic Capped Colloidal Zinc Oxide Quantum Dots and Their UV Dominant Emission Property

Published online by Cambridge University Press:  31 January 2011

Takahisa Omata ,
Kazuyuki Takahashi ,
Shinichi Hashimoto ,
Yasuhiro Maeda ,
Katsuhiro Nose  and
Shinya Otsuka-Yao-Matsuo
Takahisa Omata
Affiliation:
omata@mat.eng.osaka-u.ac.jp
Kazuyuki Takahashi
Affiliation:
kazuyuki.takahashi@mat.eng.osaka-u.ac.jp, Osaka University, Div. Mater. & Manufct. Sci., Grad. Sch. Eng, Suita, Japan
Shinichi Hashimoto
Affiliation:
shinichi-1008@ma.medias.ne.jp, Osaka University, Div. Mater. & Manufct. Sci., Grad. Sch. Eng, Suita, Japan
Yasuhiro Maeda
Affiliation:
yasuhiro.maeda@mat.eng.osaka-u.ac.jp, Osaka University, Div. Mater. & Manufct. Sci., Grad. Sch. Eng, Suita, Japan
Katsuhiro Nose
Affiliation:
nose-k@iis.u-tokyo.ac.jp, Osaka University, Div. Mater. & Manufct. Sci., Grad. Sch. Eng, Suita, Japan
Shinya Otsuka-Yao-Matsuo
Affiliation:
shinya@mat.eng.osaka-u.ac.jp, Osaka University, Div. Mater. & Manufct. Sci., Grad. Sch. Eng, Suita, Japan
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Abstract

A novel synthesis route to organic-capped and colloidal ZnO quantum dots (QDs) has been developed. Specifically, zinc-di-butoxide was hydrolyzed with very dilute water (100˜600 mass ppm) dissolved in hydrophilic benzylamine and polymerized to ZnO by dehydration condensation. After formation of ZnO QDs with 2˜3 nm in diameter, growth of the QDs and exchange the surface capping ligand from hydroxyl groups and/or benzylamine to oleylamine were developed by heating the colloidal solution with oleylamine. The size of the ZnO QDs finally obtained was in the range 3˜5 nm in diameter. The QDs show high dispersibility in various organic solvents. Clear UV emission due to exciton recombination was observed; and its energy was varied according to the quantum size effect from 3.39 to 3.54 eV. By using lithium-free zinc-di-butoxide as a starting material, the defect-related VIS emission was successfully decreased and the UV emission becomes dominant. The influence of water concentration in benzylamine and oleylamine on UV emission intensity was also investigated.

Keywords

chemical synthesiscolloidoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1207: Symposium N – Colloidal Nanoparticles for Electronic Applications — Light Emission, Detection, Photovoltaics and Transport , 2009 , 1207-N10-49
Copyright
Copyright © Materials Research Society 2010

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