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

Gunisha Jain; Conor Rocks; Paul Maguire; Davide Mariotti

doi:10.1088/1361-6528/ab72b5

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 language	English
Article number	215707
Number of pages	9
Journal	Nanotechnology
Volume	31
Issue number	21
DOIs	https://doi.org/10.1088/1361-6528/ab72b5
Publication status	Published (in print/issue) - 10 Mar 2020

Keywords

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

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

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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AU - Jain, Gunisha

AU - Rocks, Conor

AU - Maguire, Paul

AU - Mariotti, Davide

PY - 2020/3/10

Y1 - 2020/3/10

N2 - 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.

AB - 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.

KW - Hydroxy-terminated ZnO quantum dots

KW - Quantum confinement

KW - Band alignment

KW - Photoluminescence

KW - Defect-free

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JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 21

M1 - 215707

ER -

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

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