TY - GEN
T1 - Synthesis of organic capped colloidal zinc oxide quantum dots and their UV dominant emission property
AU - Omata, Takahisa
AU - Takahashi, Kazuyuki
AU - Hashimoto, Shinichi
AU - Maeda, Yasuhiro
AU - Nose, Katsuhiro
AU - Otsuka-Yao-Matsuo, Shinya
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77957817039&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957817039&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:77957817039
SN - 9781617387623
T3 - Materials Research Society Symposium Proceedings
SP - 31
EP - 36
BT - Colloidal Nanoparticles for Electronic Applications - Light Emission, Detection, Photovoltaics, and Transport
T2 - 2009 MRS Fall Meeting
Y2 - 30 November 2009 through 4 December 2009
ER -