One-step synthesis of strongly confined, defect-free and hydroxy-terminated ZnO quantum dots

Gunisha Jain, Conor Rocks, Paul Maguire, Davide Mariotti

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Abstract

This paper reports the production of strongly confined ligand-free, defect-free, hydroxy-terminated ZnO quantum dots with a mean diameter of 1.9 nm, by radio frequency atmospheric pressure microplasma. Systematic characterization is performed to understand the surface chemistry of ZnO quantum dots. Photoluminescence studies show strong confinement effect on emission with only ultraviolet (UV) emission without any defect-related visible emission. Emission is again tested after eighteen months and confirms the QDs long-term emission stability. The mechanism responsible for this UV emission is also discussed and originates from OH-related surface terminations.
Original languageEnglish
Article number215707
Number of pages9
JournalNanotechnology
Volume31
Issue number21
DOIs
Publication statusPublished - 10 Mar 2020

Keywords

  • Hydroxy-terminated ZnO quantum dots
  • Quantum confinement
  • Band alignment
  • Photoluminescence
  • Defect-free

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