Mixed Mercaptocarboxylic Acid Shells Provide Stable Dispersions of InPZnS/ZnSe/ZnS Multishell Quantum Dots in Aqueous Media
Highly luminescent indium phosphide zinc sulfide (InPZnS) quantum dots (QDs), with zinc selenide/zinc sulfide (ZnSe/ZnS) shells, were synthesized. The QDs were modified via a post-synthetic ligand exchange reaction with 3-mercaptopropionic acid (MPA) and 11-mercaptoundecanoic acid (MUA) in different...
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MDPI AG
2020-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/9/1858 |
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| author | Benjamin Heyne Kristin Arlt André Geßner Alexander F. Richter Markus Döblinger Jochen Feldmann Andreas Taubert Armin Wedel |
| author_facet | Benjamin Heyne Kristin Arlt André Geßner Alexander F. Richter Markus Döblinger Jochen Feldmann Andreas Taubert Armin Wedel |
| author_sort | Benjamin Heyne |
| collection | DOAJ |
| description | Highly luminescent indium phosphide zinc sulfide (InPZnS) quantum dots (QDs), with zinc selenide/zinc sulfide (ZnSe/ZnS) shells, were synthesized. The QDs were modified via a post-synthetic ligand exchange reaction with 3-mercaptopropionic acid (MPA) and 11-mercaptoundecanoic acid (MUA) in different MPA:MUA ratios, making this study the first investigation into the effects of mixed ligand shells on InPZnS QDs. Moreover, this article also describes an optimized method for the correlation of the QD size vs. optical absorption of the QDs. Upon ligand exchange, the QDs can be dispersed in water. Longer ligands (MUA) provide more stable dispersions than short-chain ligands. Thicker ZnSe/ZnS shells provide a better photoluminescence quantum yield (PLQY) and higher emission stability upon ligand exchange. Both the ligand exchange and the optical properties are highly reproducible between different QD batches. Before dialysis, QDs with a ZnS shell thickness of ~4.9 monolayers (ML), stabilized with a mixed MPA:MUA (mixing ratio of 1:10), showed the highest PLQY, at ~45%. After dialysis, QDs with a ZnS shell thickness of ~4.9 ML, stabilized with a mixed MPA:MUA and a ratio of 1:10 and 1:100, showed the highest PLQYs, of ~41%. The dispersions were stable up to 44 days at ambient conditions and in the dark. After 44 days, QDs with a ZnS shell thickness of ~4.9 ML, stabilized with only MUA, showed the highest PLQY, of ~34%. |
| first_indexed | 2024-03-10T16:16:12Z |
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| language | English |
| last_indexed | 2024-03-10T16:16:12Z |
| publishDate | 2020-09-01 |
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| series | Nanomaterials |
| spelling | doaj.art-0b8460a3b8794151be9b3867616a51bd2023-11-20T14:01:40ZengMDPI AGNanomaterials2079-49912020-09-01109185810.3390/nano10091858Mixed Mercaptocarboxylic Acid Shells Provide Stable Dispersions of InPZnS/ZnSe/ZnS Multishell Quantum Dots in Aqueous MediaBenjamin Heyne0Kristin Arlt1André Geßner2Alexander F. Richter3Markus Döblinger4Jochen Feldmann5Andreas Taubert6Armin Wedel7Fraunhofer IAP, Geiselbergstraße 69, 14476 Potsdam, GermanyFraunhofer IAP, Geiselbergstraße 69, 14476 Potsdam, GermanyFraunhofer IAP, Geiselbergstraße 69, 14476 Potsdam, GermanyPhotonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, GermanyDepartment of Chemistry, Ludwig-Maximilians-Universität (LMU), Butenandtstraße 5-13 (E), 81377 Munich, GermanyPhotonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, GermanyInstitute of Chemistry, University of Potsdam, 14469 Potsdam, GermanyFraunhofer IAP, Geiselbergstraße 69, 14476 Potsdam, GermanyHighly luminescent indium phosphide zinc sulfide (InPZnS) quantum dots (QDs), with zinc selenide/zinc sulfide (ZnSe/ZnS) shells, were synthesized. The QDs were modified via a post-synthetic ligand exchange reaction with 3-mercaptopropionic acid (MPA) and 11-mercaptoundecanoic acid (MUA) in different MPA:MUA ratios, making this study the first investigation into the effects of mixed ligand shells on InPZnS QDs. Moreover, this article also describes an optimized method for the correlation of the QD size vs. optical absorption of the QDs. Upon ligand exchange, the QDs can be dispersed in water. Longer ligands (MUA) provide more stable dispersions than short-chain ligands. Thicker ZnSe/ZnS shells provide a better photoluminescence quantum yield (PLQY) and higher emission stability upon ligand exchange. Both the ligand exchange and the optical properties are highly reproducible between different QD batches. Before dialysis, QDs with a ZnS shell thickness of ~4.9 monolayers (ML), stabilized with a mixed MPA:MUA (mixing ratio of 1:10), showed the highest PLQY, at ~45%. After dialysis, QDs with a ZnS shell thickness of ~4.9 ML, stabilized with a mixed MPA:MUA and a ratio of 1:10 and 1:100, showed the highest PLQYs, of ~41%. The dispersions were stable up to 44 days at ambient conditions and in the dark. After 44 days, QDs with a ZnS shell thickness of ~4.9 ML, stabilized with only MUA, showed the highest PLQY, of ~34%.https://www.mdpi.com/2079-4991/10/9/1858quantum dotsQDscadmium-freeCd-freeInPInPZnS |
| spellingShingle | Benjamin Heyne Kristin Arlt André Geßner Alexander F. Richter Markus Döblinger Jochen Feldmann Andreas Taubert Armin Wedel Mixed Mercaptocarboxylic Acid Shells Provide Stable Dispersions of InPZnS/ZnSe/ZnS Multishell Quantum Dots in Aqueous Media Nanomaterials quantum dots QDs cadmium-free Cd-free InP InPZnS |
| title | Mixed Mercaptocarboxylic Acid Shells Provide Stable Dispersions of InPZnS/ZnSe/ZnS Multishell Quantum Dots in Aqueous Media |
| title_full | Mixed Mercaptocarboxylic Acid Shells Provide Stable Dispersions of InPZnS/ZnSe/ZnS Multishell Quantum Dots in Aqueous Media |
| title_fullStr | Mixed Mercaptocarboxylic Acid Shells Provide Stable Dispersions of InPZnS/ZnSe/ZnS Multishell Quantum Dots in Aqueous Media |
| title_full_unstemmed | Mixed Mercaptocarboxylic Acid Shells Provide Stable Dispersions of InPZnS/ZnSe/ZnS Multishell Quantum Dots in Aqueous Media |
| title_short | Mixed Mercaptocarboxylic Acid Shells Provide Stable Dispersions of InPZnS/ZnSe/ZnS Multishell Quantum Dots in Aqueous Media |
| title_sort | mixed mercaptocarboxylic acid shells provide stable dispersions of inpzns znse zns multishell quantum dots in aqueous media |
| topic | quantum dots QDs cadmium-free Cd-free InP InPZnS |
| url | https://www.mdpi.com/2079-4991/10/9/1858 |
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