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  1. Article ; Online: Two-dimensional assembled PVP-modified silver nanoprisms guided by butanol for surface-enhanced Raman scattering-based invisible printing platforms.

    Sugawa, Kosuke / Hayakawa, Yutaro / Aida, Yukiko / Kajino, Yuto / Tamada, Kaoru

    Nanoscale

    2022  Volume 14, Issue 26, Page(s) 9278–9285

    Abstract: This study proposes a methodology for the fabrication of two-dimensional assembled colloidal nanocrystals based on the classical theory for the surface excess of a short-chain alcohol (butanol) in an aqueous mixture and Rayleigh-Bénard-Marangoni ... ...

    Abstract This study proposes a methodology for the fabrication of two-dimensional assembled colloidal nanocrystals based on the classical theory for the surface excess of a short-chain alcohol (butanol) in an aqueous mixture and Rayleigh-Bénard-Marangoni convection caused by temperature and/or surface tension gradients due to the volatilization of butanol at the air-water interface. When polyvinylpyrrolidone (PVP)-modified anisotropic silver nanoprisms dispersed in butanol were added into the water phase, the nanoprisms were guided to the air-water interface
    Language English
    Publishing date 2022-07-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d2nr01725c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Modulation Technique of Localized Surface Plasmon Resonance of Palladium Nanospheres by Coating with Titanium Dioxide Shell for Application to Photothermal Therapy Agent.

    Hayakawa, Yutaro / Furuya, Masato / Tahara, Hironobu / Kosuge, Yasuhiro / Kimura, Tsuyoshi / Sugawa, Kosuke / Otsuki, Joe

    Nanoscale research letters

    2022  Volume 17, Issue 1, Page(s) 60

    Abstract: Although plasmonic palladium (Pd) nanospheres are thermodynamically stable and have high photothermal conversion due to the free and bound electron coupling associated with the intrinsic high interband transition, they have not attracted attention as a ... ...

    Abstract Although plasmonic palladium (Pd) nanospheres are thermodynamically stable and have high photothermal conversion due to the free and bound electron coupling associated with the intrinsic high interband transition, they have not attracted attention as a photothermal conversion material for next-generation photothermal cancer therapy. This is because the Pd nanospheres generate the localized surface plasmon resonance (LSPR) intrinsically in the ultraviolet region, which is far away from the biological transparent window (750-900 nm). In this study, we controlled the LSP wavelength of Pd nanospheres by coating with high refractive index TiO
    Language English
    Publishing date 2022-06-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2253244-4
    ISSN 1556-276X ; 1931-7573
    ISSN (online) 1556-276X
    ISSN 1931-7573
    DOI 10.1186/s11671-022-03697-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Photothermal therapeutic ability of copper open-shell nanostructures that are effective in the second biological transparency window based on symmetry breaking-induced plasmonic properties.

    Sugawa, Kosuke / Suzuki, Arisa / Honda, Jotaro / Yabuki, Taiku / Tahara, Hironobu / Hayakawa, Yutaro / Furuya, Masato / Ikake, Hiroki / Kimura, Tsuyoshi / Kosuge, Yasuhiro / Kurumi, Satoshi / Akiyama, Tsuyoshi / Takase, Kouichi / Otsuki, Joe

    Journal of materials chemistry. B

    2023  Volume 11, Issue 29, Page(s) 6837–6852

    Abstract: In this study, a photothermal therapy agent that works efficiently in the second biological transparency window was developed based on the localized surface plasmon (LSP) resonance of symmetry-broken open-shell nanostructures of low-cost Cu (CuOSNs). The ...

    Abstract In this study, a photothermal therapy agent that works efficiently in the second biological transparency window was developed based on the localized surface plasmon (LSP) resonance of symmetry-broken open-shell nanostructures of low-cost Cu (CuOSNs). The strong LSP resonance and superior photothermal conversion ability in the second biological transparency window were achieved by generating the dipolar bonding mode due to the plasmon hybridization between the nanoshell dipole and the nanohole dipole at the opening edge in CuOSNs derived from the symmetry breaking of a Cu nanoshell. Oxidative dissolution of CuOSNs in water was significantly suppressed by successive coating with the self-assembled monolayer of 16-mercaptohexadecanoic acid and a thin silica layer. Furthermore, the stability in phosphate buffered saline, which models the biological environment, was attained by further coating the nanoparticles with polyethylene glycol. It was demonstrated from
    MeSH term(s) Humans ; Copper/pharmacology ; Copper/chemistry ; HeLa Cells ; Nanostructures/chemistry ; Nanoparticles ; Polyethylene Glycols/chemistry
    Chemical Substances Copper (789U1901C5) ; Polyethylene Glycols (3WJQ0SDW1A)
    Language English
    Publishing date 2023-07-26
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2702241-9
    ISSN 2050-7518 ; 2050-750X
    ISSN (online) 2050-7518
    ISSN 2050-750X
    DOI 10.1039/d3tb00443k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Combined Use of Anisotropic Silver Nanoprisms with Different Aspect Ratios for Multi-Mode Plasmon-Exciton Coupling.

    Takeshima, Naoto / Sugawa, Kosuke / Tahara, Hironobu / Jin, Shota / Noguchi, Masaki / Hayakawa, Yutaro / Yamakawa, Yuhei / Otsuki, Joe

    Nanoscale research letters

    2020  Volume 15, Issue 1, Page(s) 15

    Abstract: Absorption enhancement based on interaction between the localized surface plasmon (LSP) and molecular exciton is one of the most important phenomena for the development of high-performance solar devices. In this study, hybrids of plasmonic metal ... ...

    Abstract Absorption enhancement based on interaction between the localized surface plasmon (LSP) and molecular exciton is one of the most important phenomena for the development of high-performance solar devices. In this study, hybrids of plasmonic metal nanoparticles and dye molecules have been developed, which exhibit enhanced absorption at precisely tuned wavelengths in a visible region. The hybrids consist of a porphyrin derivative, which has four absorption peaks (Q-bands) in a range of 500-700 nm, and triangular silver nanoprisms (AgPRs), which are developed by us to exhibit precisely tuned LSP resonance wavelengths. Absorption enhancement over the whole Q-band range is induced by the combined use of three kinds of AgPRs of different aspect ratios. Furthermore, the quantitative evaluation of absorption enhancement based on the LSP-based fluorescence enhancement phenomenon has demonstrated that efficient absorption enhancement can be effected at multiple wavelengths.
    Language English
    Publishing date 2020-01-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2253244-4
    ISSN 1556-276X ; 1931-7573
    ISSN (online) 1556-276X
    ISSN 1931-7573
    DOI 10.1186/s11671-020-3248-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Plasmonic Silver Nanoprism-Induced Emissive Mode Control between Fluorescence and Phosphorescence of a Phosphorescent Palladium Porphyrin Derivative.

    Takeshima, Naoto / Sugawa, Kosuke / Tahara, Hironobu / Jin, Shota / Wakui, Hiroki / Fukushima, Misa / Tokuda, Kyo / Igari, Shuto / Kanakubo, Kotomi / Hayakawa, Yutaro / Katoh, Ryuzi / Takase, Kouichi / Otsuki, Joe

    ACS nano

    2019  Volume 13, Issue 11, Page(s) 13244–13256

    Abstract: We have succeeded in significantly enhancing fluorescence from intrinsically phosphorescent palladium octaethylporphyrin (Pd-porphyrin) that has an intersystem crossing efficiency of ∼1 by using silver nanoprisms (AgPRs). This was achieved by controlling ...

    Abstract We have succeeded in significantly enhancing fluorescence from intrinsically phosphorescent palladium octaethylporphyrin (Pd-porphyrin) that has an intersystem crossing efficiency of ∼1 by using silver nanoprisms (AgPRs). This was achieved by controlling the wavelength of the localized surface plasmon (LSP) resonance of AgPRs and the distance between the Pd-porphyrin molecules and the AgPR surfaces. In addition to enhancing phosphorescence by spectrally overlapping the phosphorescence band with the LSP resonance band, tuning the LSP wavelength to approximately 520 nm led to the appearance of a new emission band around the wavelength corresponding to the fluorescent radiation. The appearance of fluorescence suggests that the nonradiative energy transfer from the singlet excited state of Pd-porphyrin to the LSP of AgPRs overcame the ultrafast intramolecular intersystem crossing to the triplet excited state, manifesting the spectral properties of the singlet excited state of Pd-porphyrin. The fluorescence nature of this radiation was strongly supported by lifetime measurements of the hybrids of Pd-porphyrin and AgPRs. Furthermore, the dependence of the emissive intensities on the distance between the Pd-porphyrin molecules and the AgPR surfaces showed interesting opposite trends. The fluorescence intensity was increased as the distance between the molecules and the AgPRs was decreased from 10.5 to 1 nm, while the phosphorescence intensity was decreased, which indicates that the LSP-induced fluorescence radiation process from Pd-porphyrin near the AgPRs outweighed the quenching by the AgPRs, even though the phosphorescence significantly suffered quenching.
    Language English
    Publishing date 2019-11-01
    Publishing country United States
    Document type Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.9b06269
    Database MEDical Literature Analysis and Retrieval System OnLINE

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