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 journalArticlepeer-review

16 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 languageEnglish
Pages (from-to)274-281
Number of pages8
JournalJournal of Colloid And Interface Science
Volume355
Issue number2
DOIs
Publication statusPublished - 2011 Mar 15
Externally publishedYes

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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