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:	Mohammad S. Almomani, Naser M. Ahmed, Marzaini Rashid, M. K. M. Ali, H. Akhdar, O. Aldaghri, K. H. Ibnaouf
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ZnSiQDs electrochemical etching photoluminescence quantum confinement core–shell Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/055658dbd9444cabb61101399a066e25
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spelling	oai:doaj.org-article:055658dbd9444cabb61101399a066e252021-11-25T18:32:54ZEnhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy10.3390/nano111131582079-4991https://doaj.org/article/055658dbd9444cabb61101399a066e252021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3158https://doaj.org/toc/2079-4991Despite 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<sub>4</sub>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<sub>4</sub>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<sub>4</sub>OH were enhanced by 198.8% and 132.6%, respectively. The bandgap of the ZnSiQDs conditioned without and with NH<sub>4</sub>OH was approximately 3.6 and 2.3 eV, respectively.Mohammad S. AlmomaniNaser M. AhmedMarzaini RashidM. K. M. AliH. AkhdarO. AldaghriK. H. IbnaoufMDPI AGarticleZnSiQDselectrochemical etchingphotoluminescencequantum confinementcore–shellChemistryQD1-999ENNanomaterials, Vol 11, Iss 3158, p 3158 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ZnSiQDs electrochemical etching photoluminescence quantum confinement core–shell Chemistry QD1-999
spellingShingle	ZnSiQDs electrochemical etching photoluminescence quantum confinement core–shell Chemistry QD1-999 Mohammad S. Almomani Naser M. Ahmed Marzaini Rashid M. K. M. Ali H. Akhdar O. Aldaghri K. H. Ibnaouf Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy
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<sub>4</sub>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<sub>4</sub>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<sub>4</sub>OH were enhanced by 198.8% and 132.6%, respectively. The bandgap of the ZnSiQDs conditioned without and with NH<sub>4</sub>OH was approximately 3.6 and 2.3 eV, respectively.
format	article
author	Mohammad S. Almomani Naser M. Ahmed Marzaini Rashid M. K. M. Ali H. Akhdar O. Aldaghri K. H. Ibnaouf
author_facet	Mohammad S. Almomani Naser M. Ahmed Marzaini Rashid M. K. M. Ali H. Akhdar O. Aldaghri K. H. Ibnaouf
author_sort	Mohammad S. Almomani
title	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_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_sort	enhancement of temperature fluorescence brightness of zn@si core-shell quantum dots produced via a unified strategy
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/055658dbd9444cabb61101399a066e25
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Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

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