UV luminescent organic-capped ZnO quantum dots synthesized by alkoxide hydrolysis with dilute water

Takahisa Omata; Kazuyuki Takahashi; Shinichi Hashimoto; Yasuhiro Maeda; Katsuhiro Nose; Shinya Otsuka-Yao-Matsuo; Kenji Kanaori

doi:10.1016/j.jcis.2010.12.014

UV luminescent organic-capped ZnO quantum dots synthesized by alkoxide hydrolysis with dilute water

Takahisa Omata, Kazuyuki Takahashi, Shinichi Hashimoto, Yasuhiro Maeda, Katsuhiro Nose, Shinya Otsuka-Yao-Matsuo, Kenji Kanaori

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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.

Original language	English
Pages (from-to)	274-281
Number of pages	8
Journal	Journal of Colloid And Interface Science
Volume	355
Issue number	2
DOIs	https://doi.org/10.1016/j.jcis.2010.12.014
Publication status	Published - 2011 Mar 15
Externally published	Yes

Keywords

Colloidal solution
Quantum dots
Solution process
UV emission
Zinc oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

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10.1016/j.jcis.2010.12.014

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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.",

keywords = "Colloidal solution, Quantum dots, Solution process, UV emission, Zinc oxide",

author = "Takahisa Omata and Kazuyuki Takahashi and Shinichi Hashimoto and Yasuhiro Maeda and Katsuhiro Nose and Shinya Otsuka-Yao-Matsuo and Kenji Kanaori",

note = "Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research (B) (Grant No. 20360299 ) and financial support for the Japan–Korea Joint Research Project from the Japan Society for the Promotion of Science.",

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doi = "10.1016/j.jcis.2010.12.014",

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pages = "274--281",

journal = "Journal of Colloid and Interface Science",

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T1 - UV luminescent organic-capped ZnO quantum dots synthesized by alkoxide hydrolysis with dilute water

AU - Omata, Takahisa

AU - Takahashi, Kazuyuki

AU - Hashimoto, Shinichi

AU - Maeda, Yasuhiro

AU - Nose, Katsuhiro

AU - Otsuka-Yao-Matsuo, Shinya

AU - Kanaori, Kenji

N1 - Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research (B) (Grant No. 20360299 ) and financial support for the Japan–Korea Joint Research Project from the Japan Society for the Promotion of Science.

PY - 2011/3/15

Y1 - 2011/3/15

N2 - 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.

AB - 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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KW - Solution process

KW - UV emission

KW - Zinc oxide

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UV luminescent organic-capped ZnO quantum dots synthesized by alkoxide hydrolysis with dilute water

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