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

Jain, Gunisha and Rocks, Conor and Maguire, Paul and Mariotti, Davide (2020) One-step synthesis of strongly confined, defect-free and hydroxy-terminated ZnO quantum dots. Nanotechnology, 31. 215707. ISSN 0957-4484 (https://doi.org/10.1088/1361-6528/ab72b5)

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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.

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