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Synthesis and characterization of CdS(x)Se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties
Ternary CdS(x)Se(1−x) alloy quantum dots (QDs) and CdS(x)Se(1−x)/ZnS core/shell nanocrystals exhibiting composition dependent band gaps have been successfully synthesized. The ZnS shell was doped with 0.1% and 5% of paramagnetic manganese ions so as to be used as a fluorescent/paramagnetic bi-functi...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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The Royal Society of Chemistry
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9085248/ https://www.ncbi.nlm.nih.gov/pubmed/35547268 http://dx.doi.org/10.1039/c8ra06007j |
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author | Chung, Yueh-Chi Yang, Chien-Hsin Zheng, Hao-Wen Tsai, Ping-Szu Wang, Tzong-Liu |
author_facet | Chung, Yueh-Chi Yang, Chien-Hsin Zheng, Hao-Wen Tsai, Ping-Szu Wang, Tzong-Liu |
author_sort | Chung, Yueh-Chi |
collection | PubMed |
description | Ternary CdS(x)Se(1−x) alloy quantum dots (QDs) and CdS(x)Se(1−x)/ZnS core/shell nanocrystals exhibiting composition dependent band gaps have been successfully synthesized. The ZnS shell was doped with 0.1% and 5% of paramagnetic manganese ions so as to be used as a fluorescent/paramagnetic bi-functional probe. Energy-dispersive X-ray spectroscopy (EDS) measurements confirmed the presence of Cd, S, and Se in CdS(x)Se(1−x) nanocrystals with the atomic ratios of Cd, S, and Se which are well consistent with our synthetic ratios. Wide angle X-ray diffraction (WAXD) indicated that the crystal structures of the CdS(x)Se(1−x) core QDs and CdS(x)Se(1−x)/ZnS core/shell QDs were zinc blende phases. Both dynamic light scattering (DLS) and transmission electron microscopy (TEM) revealed that the as-synthesized nanocrystals had a narrow size distribution and high crystallinity. The band gaps of CdS(x)Se(1−x) nanocrystals were adjustable by varying the ratio of S:Se in the CdS(x)Se(1−x) core and were in the range of 1.96 eV to 2.32 eV. Hence, when composition x was changed from 0 to 1, the fluorescence color of the nanocrystals varied from red to green. After shell coverage, the ternary alloy QDs exhibited a superior photoluminescence (PL) quantum yield up to 57%. In comparison with the alloy core QDs, the PL emission peaks of the CdS(x)Se(1−x)/ZnS core/shell QDs displayed a small redshift. Electron paramagnetic resonance (EPR) measurements for manganese-doped CdS(x)Se(1−x)/ZnS nanocrystals revealed paramagnetic properties for both low and high Mn(2+) doping levels. |
format | Online Article Text |
id | pubmed-9085248 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90852482022-05-10 Synthesis and characterization of CdS(x)Se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties Chung, Yueh-Chi Yang, Chien-Hsin Zheng, Hao-Wen Tsai, Ping-Szu Wang, Tzong-Liu RSC Adv Chemistry Ternary CdS(x)Se(1−x) alloy quantum dots (QDs) and CdS(x)Se(1−x)/ZnS core/shell nanocrystals exhibiting composition dependent band gaps have been successfully synthesized. The ZnS shell was doped with 0.1% and 5% of paramagnetic manganese ions so as to be used as a fluorescent/paramagnetic bi-functional probe. Energy-dispersive X-ray spectroscopy (EDS) measurements confirmed the presence of Cd, S, and Se in CdS(x)Se(1−x) nanocrystals with the atomic ratios of Cd, S, and Se which are well consistent with our synthetic ratios. Wide angle X-ray diffraction (WAXD) indicated that the crystal structures of the CdS(x)Se(1−x) core QDs and CdS(x)Se(1−x)/ZnS core/shell QDs were zinc blende phases. Both dynamic light scattering (DLS) and transmission electron microscopy (TEM) revealed that the as-synthesized nanocrystals had a narrow size distribution and high crystallinity. The band gaps of CdS(x)Se(1−x) nanocrystals were adjustable by varying the ratio of S:Se in the CdS(x)Se(1−x) core and were in the range of 1.96 eV to 2.32 eV. Hence, when composition x was changed from 0 to 1, the fluorescence color of the nanocrystals varied from red to green. After shell coverage, the ternary alloy QDs exhibited a superior photoluminescence (PL) quantum yield up to 57%. In comparison with the alloy core QDs, the PL emission peaks of the CdS(x)Se(1−x)/ZnS core/shell QDs displayed a small redshift. Electron paramagnetic resonance (EPR) measurements for manganese-doped CdS(x)Se(1−x)/ZnS nanocrystals revealed paramagnetic properties for both low and high Mn(2+) doping levels. The Royal Society of Chemistry 2018-08-24 /pmc/articles/PMC9085248/ /pubmed/35547268 http://dx.doi.org/10.1039/c8ra06007j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Chung, Yueh-Chi Yang, Chien-Hsin Zheng, Hao-Wen Tsai, Ping-Szu Wang, Tzong-Liu Synthesis and characterization of CdS(x)Se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties |
title | Synthesis and characterization of CdS(x)Se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties |
title_full | Synthesis and characterization of CdS(x)Se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties |
title_fullStr | Synthesis and characterization of CdS(x)Se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties |
title_full_unstemmed | Synthesis and characterization of CdS(x)Se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties |
title_short | Synthesis and characterization of CdS(x)Se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties |
title_sort | synthesis and characterization of cds(x)se(1−x) alloy quantum dots with composition-dependent band gaps and paramagnetic properties |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9085248/ https://www.ncbi.nlm.nih.gov/pubmed/35547268 http://dx.doi.org/10.1039/c8ra06007j |
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