| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2025-06-20 |
| タイトル |
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タイトル |
Tuning Photoluminescence and Magnetic Properties of Ag?Ga?S and Zn?Ag?Ga?S Quantum Dots via Mn2+ Doping |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Chang JIANG
Tomoya SAKAI
Kazutaka AKIYOSHI
Tatsuya KAMEYAMA
Jun KUMAGAI
Yamada Shota
Yukawa Hiroshi
Baba Yoshinobu
Taro UEMATSU
Tsukasa TORIMOTO
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
Transition metal-doped colloidal quantum dots (QDs) are promising candidates for dual-mode imaging due to their tunable optical properties and potential magnetic functionalities. Here, we report the synthesis and characterization of Mn2+-doped AgGaS2 (AGS) and ZnS-alloyed Ag?Ga?S (AGZS) QDs via a one-pot heating-up method. Upon Mn2+ incorporation, both AGS and AGZS QDs exhibited two distinct photoluminescence (PL) peaks originating from the host QDs and doped Mn2+ ions, with the relative intensities tunable by varying Mn2+-to-total metal cation ratio in the precursor (Mn2+/cationpre). The AGZS QDs prepared with Mn2+/cationpre ratio of 1.1 % exhibited a high PL quantum yield of 45 %, with 40 % of the emission attributed to the d-d transition of Mn2+ ions (4T1 → 6A1). Time-resolved PL measurements revealed efficient energy transfer from excitons in the host QDs to doped Mn2+ ions, contributing to enhanced Mn2+-related emissions. Surface passivation with a ZnS shell followed by ligand exchange with 3-mercaptopropionic acid allowed stable dispersion of AGZS QDs in aqueous media while retaining optical properties. Since the Mn2+-doped QDs also exhibited paramagnetic behavior, we investigated the performance of Mn2+-doped AGZS QDs as a contrast agent for magnetic resonance imaging (MRI). The intensity of the T1-weighted MRI signal increased with an increase in the content of doped Mn2+. These results demonstrate that Mn2+-doped AGZS QDs are promising single-component dual-mode (PL/MRI) nanoprobes for biomedical imaging applications. |
| 書誌情報 |
Electrochemistry
発行日 2025-06
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| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
2186-2451 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.5796/electrochemistry.25-72069 |
