研究者詳細 - 小田　勝

論文 - 小田　勝

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Room-Temperature Strong Coupling of Hexane-Dispersed Colloidal CdSe Nanoplatelets in a Microcavity Composed of Two Bragg Reflectors 査読有り国際誌

Oda M., Yamato K., Egashira J., Kondo H.

Journal of Physical Chemistry C 2025年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

CdSe nanoplatelets (NPLs) are suitable for exploring strong light-matter coupling in semiconductor nanocrystal systems due to their giant oscillator strength and large exciton binding energy. Here, we report the facile fabrication and optical characterization of a λ/2 planar microcavity, which consists of two distributed Bragg reflectors with a hexane layer containing concentrated colloidal CdSe NPLs. Using a hexane solution layer instead of the typically used dried active layers results in a thin and flat layer, even under dense NPL conditions, almost without stressing or charging the surface of the NPLs. Reflectance spectra showed that strong light-matter coupling can be realized at room temperature and that the vacuum Rabi splitting energy is 53.5 meV. Intense photoluminescence (PL) emerges at the lower polariton branch, 25.1 meV (=E<inf>LO</inf>: longitudinal optical (LO) phonon energy) below the energy of the dark states, i.e., the exciton reservoir, indicating that relaxation from the exciton reservoir occurs efficiently in this microcavity due to LO-phonon-assisted relaxation. We describe the reflectance and PL properties using a model in which a cavity photon couples to a one-exciton state delocalized over nonuniformly oriented NPLs. This model contributes to an intuitive, quantitative understanding of the microcavity containing colloidal NPLs.

DOI： 10.1021/acs.jpcc.5c02685

Scopus

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Fabrication of quantum dot-immobilized Y<inf>2</inf>O<inf>3</inf> microspheres with effective photoluminescence for cancer radioembolization therapy 査読有り国際誌

Miyazaki T., Wakayama T., Oda M., Kawashita M.

Science and Technology of Advanced Materials 25 ( 1 ) 2024年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Microspheres composed of Y-containing materials are effective agents for cancer radioembolization therapy using β-rays. The distribution and dynamics of these microspheres in tissues can be easily determined by providing the microspheres with an imaging function. In addition, the use of quantum dots will enable the detection of microspheres at the individual particle level with high sensitivity. In this study, core – shell quantum dots were bound to chemically modified yttria microspheres under various conditions, and the effect of reaction conditions on the photoluminescence properties of the microspheres was investigated. The quantum dots were immobilized on the surfaces of the microspheres through dehydration – condensation reactions between the carboxy groups of quantum dots and the amino groups of silanetreated microspheres. As the reaction time increased, the photoluminescence peak blue shifted, and the photoluminescence intensity and lifetime decreased. Therefore, a moderate period of the immobilization process was optimal for imparting effective photoluminescence properties. This study is expected to facilitate particle-level tracking of microsphere dynamics in biological tissues for the development of minimally invasive cancer radiotherapy of deepseated tumors. IMPACT STATEMENT We have established a method to immobilize quantum dots on yttria microspheres for cancer radiotherapy and revealed that photoluminescence intensity can be optimized by controlling the immobilization treatment time.

DOI： 10.1080/14686996.2024.2331412

Scopus

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溶液分散型CdSeナノプレートレット微小光共振器の室温におけるポラリトン発光特性

江頭潤哉, 大和千晃, 馬郡佑季, *小田勝, 近藤久雄

第34回光物性研究会論文集 34 19 - 22 2023年12月

高圧ねじり加工した ZnO の拡散反射スペクトル

本原拓弥, 小林春也, *小田勝, 堀田善治, 山本愛士

第34回光物性研究会論文集 34 191 - 194 2023年12月

溶液分散CdSeナノプレートレット微小共振器の角度分解発光スペクトル

大和千晃, 江頭潤哉, 松尾洋希, 中石勝之介, 小田勝, 近藤久雄

第33回光物性研究会論文集 33 215 - 218 2022年12月

量子ドット蛍光発光強度時系列データのための隠れマルコフモデル解析

古田達央, 濱田啓輔, 小田勝, 中村和磨

第33回光物性研究会論文集 33 211 - 214 2022年12月

Hidden Markov model analysis for fluorescent time series of quantum dots 査読有り

Tatsuhiro Furuta, Keisuke Hamada, Masaru Oda, and Kazuma Nakamura

Physical Review B ( APS ) 106 104305 2022年09月

Modification of the synthesis of layered titanium chloride nitride 査読有り国際誌

Tanaka M., Kataoka N., Kobayashi H., Fujioka M., Oda M., Yamamoto A., Terashima K., Nishii J., Tanaka H., Yokoya T.

Materials Research Bulletin 153 2022年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

Layered titanium nitride chloride (TiNCl) exhibits a relatively high superconducting transition of ∼16 K, and it is a candidate for the unconventional superconductor. To better understand the superconductivity, we modified the synthesis process for TiNCl. Highly crystalline TiNCl was prepared by chemical vapor transport at different transport temperatures and intercalated with sodium (Na) metal. Although the crystallographic parameters obtained through Rietveld refinement are similar, the superconducting properties strongly depend on the treatment temperature of pristine TiNCl. Optical and photoemission spectroscopy revealed an in-gap state below the Fermi level, indicating hydrogen incorporation, similar to the case of β−ZrNCl. Hydrogen temperature-programmed desorption revealed hydrogen emission against the heat treatment of the obtained pristine TiNCl. The in-gap state of hydrogen inhibits the introduction of electron carriers from the intercalated Na metal.

DOI： 10.1016/j.materresbull.2022.111896

Scopus

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CdSeナノプレートレットによる共振器ポラリトンの室温形成と発光特性

松尾洋希, 中石勝之介, 小田勝, 近藤久雄

第32回光物性研究会論文集 ( 第32回光物性研究会 ) 32 2021年12月

高濃度CdSeナノプレートレット溶液を入れた微小共振器の作製とその光学特性評価

永木健太, 松尾洋希, 中石勝之助, 河野結愛, 小田勝, 近藤久雄

第31回光物性研究会論文集 31 253 - 256 2020年12月

CdSeナノプレートレットの合成と微小光共振器効果

細川拓哉、永木健太、松尾洋希、小田勝、近藤久雄

第30回光物性研究会論文集 2019年12月

Synthesis and characterization of quantum dot chains: Self-assembly of mercaptopropionic-acid-capped quantum dots conjugated with short single-stranded DNA 査読有り

Oda M., Sasano K., Nishi A., Zako T., Tani T.

Journal of Physics: Conference Series 1220 ( 1 ) 2019年05月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© Published under licence by IOP Publishing Ltd. In this paper, we describe the synthesis and characterization of quantum dot (QD) chains. We used small QD-DNA conjugates, i.e., short-ligand-capped QDs conjugated with short (15-mers) single-stranded DNA, as the building blocks. The small conjugates were separated based on the valence of the DNA, i.e., the amount of DNA per particle, using agarose gel electrophoresis. The conjugates formed self-assemblies composed of closely spaced (inter-particle spacing of 0.6-2 nm) QDs. We report the results of our investigation of the electrophoresis and hybridization of the conjugation.

DOI： 10.1088/1742-6596/1220/1/012051

Scopus

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量子ドット一次元配列構造作製へ向けたDNA 機能化量子ドットの分離・精製法の開発

佐々野晃輔、西輝、小田勝、座古保

第29回光物性研究会 2018年12月

微小光共振器中における溶液分散コロイド状半導体量子ドットの発光評価

荒井淳志、細川拓也、小田勝、近藤久雄

第29回光物性研究会論文集 2018年12月

Gel electrophoresis and hybridization of DNA-functionalized quantum-dots as part of a study of linear quantum-dot chains 査読有り

M. Oda, K. Sasano, A. Nishi, T. Zako, T. Tani

EPJ Web of Conferences 190 03009 2018年09月

溶液浸透法によるハロゲン化鉛ぺロブスカイト化合物の単結晶薄膜の作製とその光学応答

近藤久雄, 小田勝

光物性研究会論文集 29 249 - 252 2018年01月

有機無機層状ペロブスカイト型半導体微小共振器における光学応答

近藤久雄, 小田勝

光物性研究会論文集 29 129 - 132 2018年01月

アントラセン微小共振器におけるポラリトン発光

近藤久雄, 小田勝

光物性研究会論文集 29 221 - 224 2018年01月

Synthesis, characterization and its photoluminescence properties of group I-III-VI2 CuInS2 nanocrystals 査読有り

M. Oda, T. Miyaoka, S. Yamada, and T. Tani

Phys. Procedia 29 18 - 24 2012年06月

Room-temperature fluorescence lifetime of pseudoisocyanine (PIC) J excitons with various aggregate morphologies in relation to microcavity polariton formation

Y. Obara, K. Saitoh, M. Oda, T. Tani

International Journal of Molecular Sciences 13 5851 - 5865 2012年05月

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