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Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

Despite many dedicated efforts, the fabrication of high-quality ZnO-incorporated Zinc@Silicon (Zn@Si) core–shell quantum dots (ZnSiQDs) with customized properties remains challenging. In this study, we report a new record for the brightness enhancement of ZnSiQDs prepared via a unified top-down and...

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Autores principales: Almomani, Mohammad S., Ahmed, Naser M., Rashid, Marzaini, Ali, M. K. M., Akhdar, H., Aldaghri, O., Ibnaouf, K. H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8623329/
https://www.ncbi.nlm.nih.gov/pubmed/34835923
http://dx.doi.org/10.3390/nano11113158
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author Almomani, Mohammad S.
Ahmed, Naser M.
Rashid, Marzaini
Ali, M. K. M.
Akhdar, H.
Aldaghri, O.
Ibnaouf, K. H.
author_facet Almomani, Mohammad S.
Ahmed, Naser M.
Rashid, Marzaini
Ali, M. K. M.
Akhdar, H.
Aldaghri, O.
Ibnaouf, K. H.
author_sort Almomani, Mohammad S.
collection PubMed
description Despite many dedicated efforts, the fabrication of high-quality ZnO-incorporated Zinc@Silicon (Zn@Si) core–shell quantum dots (ZnSiQDs) with customized properties remains challenging. In this study, we report a new record for the brightness enhancement of ZnSiQDs prepared via a unified top-down and bottom-up strategy. The top-down approach was used to produce ZnSiQDs with uniform sizes and shapes, followed by the bottom-up method for their re-growth. The influence of various NH(4)OH contents (15 to 25 µL) on the morphology and optical characteristics of ZnSiQDs was investigated. The ZnSiQDs were obtained from the electrochemically etched porous Si (PSi) with Zn inclusion (ZnPSi), followed by the electropolishing and sonication in acetone. EFTEM micrographs of the samples prepared without and with NH(4)OH revealed the existence of spherical ZnSiQDs with a mean diameter of 1.22 to 7.4 nm, respectively. The emission spectra of the ZnSiQDs (excited by 365 nm) exhibited bright blue, green, orange-yellow, and red luminescence, indicating the uniform morphology related to the strong quantum confinement ZnSiQDs. In addition, the absorption and emission of the ZnSiQDs prepared with NH(4)OH were enhanced by 198.8% and 132.6%, respectively. The bandgap of the ZnSiQDs conditioned without and with NH(4)OH was approximately 3.6 and 2.3 eV, respectively.
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spelling pubmed-86233292021-11-27 Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy Almomani, Mohammad S. Ahmed, Naser M. Rashid, Marzaini Ali, M. K. M. Akhdar, H. Aldaghri, O. Ibnaouf, K. H. Nanomaterials (Basel) Article Despite many dedicated efforts, the fabrication of high-quality ZnO-incorporated Zinc@Silicon (Zn@Si) core–shell quantum dots (ZnSiQDs) with customized properties remains challenging. In this study, we report a new record for the brightness enhancement of ZnSiQDs prepared via a unified top-down and bottom-up strategy. The top-down approach was used to produce ZnSiQDs with uniform sizes and shapes, followed by the bottom-up method for their re-growth. The influence of various NH(4)OH contents (15 to 25 µL) on the morphology and optical characteristics of ZnSiQDs was investigated. The ZnSiQDs were obtained from the electrochemically etched porous Si (PSi) with Zn inclusion (ZnPSi), followed by the electropolishing and sonication in acetone. EFTEM micrographs of the samples prepared without and with NH(4)OH revealed the existence of spherical ZnSiQDs with a mean diameter of 1.22 to 7.4 nm, respectively. The emission spectra of the ZnSiQDs (excited by 365 nm) exhibited bright blue, green, orange-yellow, and red luminescence, indicating the uniform morphology related to the strong quantum confinement ZnSiQDs. In addition, the absorption and emission of the ZnSiQDs prepared with NH(4)OH were enhanced by 198.8% and 132.6%, respectively. The bandgap of the ZnSiQDs conditioned without and with NH(4)OH was approximately 3.6 and 2.3 eV, respectively. MDPI 2021-11-22 /pmc/articles/PMC8623329/ /pubmed/34835923 http://dx.doi.org/10.3390/nano11113158 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Almomani, Mohammad S.
Ahmed, Naser M.
Rashid, Marzaini
Ali, M. K. M.
Akhdar, H.
Aldaghri, O.
Ibnaouf, K. H.
Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy
title Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy
title_full Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy
title_fullStr Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy
title_full_unstemmed Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy
title_short Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy
title_sort enhancement of temperature fluorescence brightness of zn@si core-shell quantum dots produced via a unified strategy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8623329/
https://www.ncbi.nlm.nih.gov/pubmed/34835923
http://dx.doi.org/10.3390/nano11113158
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