Kyushu University [TAMADA KAORU (Professor) Institute for Materials Chemistry and Engineering, Department of Fundamental Organic Chemistry]

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TAMADA KAORU
Professor
Department of Fundamental Organic Chemistry
Institute for Materials Chemistry and Engineering
Last modified date：2024.04.09

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Department of Chemistry
Graduate School of Sciences

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Vice President

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1.	Kosuke Sugawa, Yutaro Hayakawa, Yukiko Aida, Yuto Kajino, Kaoru Tamada, Two-dimensional assembled PVP-modified silver nanoprisms guided by butanol for surface-enhanced Raman scattering-based invisible printing platforms, Nanoscale, 14, 26, 9278-9285, 2022.06.
2.	Meng Cheng Yen, Chia Jung Lee, Yung Chi Yao, Yuan Ling Chen, Sheng Chan Wu, Hsu Cheng Hsu, Yuto Kajino, Gong Ru Lin, Kaoru Tamada, Ya Ju Lee, Tamm-Plasmon Exciton-Polaritons in Single-Monolayered CsPbBr3 Quantum Dots at Room Temperature, Adv. Optical Mater., 10.1002/adom.202202326, 11, 2202326-2202326, 2023.11.
3.	J. Leng, T. Wang, Z.-K. Tan, Y.-J. Lee, C.-C. Chang, K. Tamada, Tuning the Emission Wavelength of Lead Halide Perovskite NCs via Size and Shape Control, ACS Omega*, doi.org/10.1021/acsomega.1c05001, 7, 1, 565-577, 2021.12.
4.	S. T. Lee, T. Kuboki, S. Kidoaki, Y. Aida, S. Ryuzaki, K. Okamoto, Y. Arima, and K. Tamada, Transient Nascent Adhesion at the Initial Stage of Cell Adhesion Visualized on a Plasmonic Metasurface, Adv. NanoBiomed Res, https://onlinelibrary.wiley.com/doi/10.1002/anbr.202100100, 2, 2100100-1-2100100-10, 2021.12.
5.	Haruka Takekuma, Junfu Leng, Kazutaka Tateishi, Yang Xu, Yinthai Chan, Sou Ryuzaki, Pangpang Wang, Koichi Okamoto, Kaoru Tamada, Layer Number-Dependent Enhanced Photoluminescence from a Quantum Dot Metamaterial Optical Resonator, ACS Applied Electronic Materials, 10.1021/acsaelm.0c01011, 3, 1, 468-475, 2021.01.
6.	Shihomi Masuda, Thasaneeya Kuboki, Satoru Kidoaki, Shi Ting Lee, Sou Ryuzaki, Koichi Okamoto, Yusuke Arima, Kaoru Tamada, High Axial and Lateral Resolutions on Self-Assembled Gold Nanoparticle Metasurfaces for Live-Cell Imaging, ACS Applied Nano Materials, 10.1021/acsanm.0c02300, 3, 11, 11135-11142, 2020.11, A plasmonic metasurface composed of homogeneously self-assembled gold nanoparticles can provide high-contrast fluorescence images confined to the nanointerface. In this study, we successfully demonstrated real-time, high-spatiotemporal-resolution imaging of adhered Venus-paxillin-3T3 live cells under a widefield microscope, where not only a high axial resolution but also a high lateral resolution down to the theoretical limit were confirmed through nascent cluster formation of paxillin. The improved lateral resolution on the sheet could be interpreted as the characteristic of localized surface plasmon resonance (LSPR)-mediated enhanced fluorescence and the metasurface acting as a nanothickness plane light emitter. We also found minimized photobleaching, owing to the increase in the emission efficiency via plasmon-exciton coupling. This simple nanomaterial-based technique will be a powerful tool to enhance interfacial signals and improve the quality of live-cell images, not only under widefield microscopes but also in combination with various super-resolution microscope systems in the future..
7.	Junfu Leng, Tian Wang, Xiaofei Zhao, Evon Woan Yuann Ong, Baisheng Zhu, Jun De Andrew Ng, Ying Chieh Wong, Khoong Hong Khoo, Kaoru Tamada, Zhi Kuang Tan, Thermodynamic Control in the Synthesis of Quantum-Confined Blue-Emitting CsPbBr3 Perovskite Nanostrips, Journal of Physical Chemistry Letters, 10.1021/acs.jpclett.9b03873, 11, 6, 2036-2043, 2020.03, Size control is critical in the synthesis of quantum-confined semiconductor nanocrystals, otherwise known as quantum dots. The achievement of size-uniformity and narrow spectral line-width in quantum dots conventionally relies on a very precise kinetic control of the reactions, where reaction time plays a significant role in defining the final crystal sizes and distribution. Here, we show that synthesis of quantum-confined perovskite nanostrips could be achieved through a thermodynamically controlled reaction, using a low-temperature and ligand-rich approach. The nanostrip growth proceeds through an initial one-dimensional (1D) nanorod stage, followed by the lateral widening of the rod to form a two-dimensional (2D) nanostrip. The spectral characteristics of the final product remain unchanged after prolonged reaction, indicating no signs of crystal ripening and confirming the thermodynamic nature of this reaction. The CsPbBr₃ perovskite nanostrips were highly uniform and emit at a deep-blue wavelength of 462 nm with a remarkably narrow line-width of 13 nm. This corresponds to color coordinates of (0.136, 0.049) on the CIE 1931 color space, which fulfils the stringent Rec. 2020 standard for next-generation color displays. The well-passivated nanostrips also possess negligible defects and provide a near-unity photoluminescence quantum yield at 94%. Crucially, the achievement of blue emission through a pure-halide perovskite circumvents the problems of spectral instability that are frequently experienced in mixed-halide perovskite systems. The convenience and scalability of our thermodynamic approach, coupled with the excellent optical attributes, would likely enable these quantum-confined perovskite systems to be the preferred method toward color control in trichromatic display applications..
8.	J. Leng, Y. Xu, Y-T. Chan, P. Wang, S. Ryuzaki, K. Okamoto & K. Tamada, Tuning the Emission Colors of Self-Assembled Quantum Dot Monolayers via One-Step Heat Treatment for Display Applications, ACS Appl. Nano Mater., 10.1021/acsanm.9b02358, 3, 3214-3222, 2020.02.
9.	Pangpang Wang, Soh Ryuzaki, Lumei Gao, Shuhei Shinohara, Noboru Saito, Koichi Okamoto, Kaoru Tamada, Sunao Yamada, Comparison of the mechanical strength of a monolayer of silver nanoparticles both in the freestanding state and on a soft substrate, Journal of Applied Physics, 10.1063/1.5063567, 125, 13, 134301, 2019.04, A 7-nm-thick monolayer comprising myristate-capped silver nanoparticles (AgNPs) was fabricated by first drop casting an AgNP solution on the surface of a 10-100 μl water drop placed on a solid substrate. With the natural evaporation of the water, a monolayer slowly descended onto the substrate, the latter containing an array of 2.5-μm-diameter and 200-nm-deep holes, and finally formed circular freestanding monolayers in the holes. Nanoindentation measurement based on atomic force microscopy was carried out on the circular freestanding monolayer at its center, and the extending and retracting force-indentation curves were recorded to analyze further the mechanical properties of the monolayer. The force-indentation curves were evidently nonlinear, and so a two-term continuum-mechanics theory was used to interpret the results. By fitting the force-indentation curves using a two-term equation, the prestress and Young’s modulus of the freestanding AgNP monolayer were obtained as approximately 0.05 N/m and several gigapascals, respectively, which are consistent with the results reported in the literature. For comparison, we also studied the mechanical responses of AgNP monolayers and bilayers on a soft polydimethylsiloxane (PDMS) substrate by using nanoindentation. Because the AgNP monolayer was stiffer than the PDMS substrate, it was possible to measure the mechanical response of the former despite it being only 7 nm thick. The mechanical strength of the freestanding AgNP monolayers was considered to be dominated by the attractive interactions between the interdigitated hydrocarbon chains of the myristate..
10.	Ayumi Ishijima, Pangpang Wang, Soh Ryuzaki, Koichi Okamoto, Kaoru Tamada, Comparison of LSPR-mediated enhanced fluorescence excited by S- and P-polarized light on a two-dimensionally assembled silver nanoparticle sheet, Applied Physics Letters, 10.1063/1.5056211, 113, 17, 171602, 2018.10, Localized surface plasmon resonance (LSPR) excited by an oblique incidence of S- and P-polarized light to a two-dimensionally assembled silver nanoparticle sheet was investigated via enhanced fluorescence under total internal reflection fluorescence (TIRF) microscopy. The finite-difference-time-domain simulation demonstrated that the S-polarized light induced a strong plasmon coupling at a nanogap between the particles, which eventually led to a highly confined, strong, and "flattened" electric field on the entire surface. In contrast, the LSPR field excited by P-polarized light was located on the individual particles, having a relatively long tail in the axial direction (low confinement). The LSPR-mediated fluorescence appeared stronger under P-polarized light than under S-polarized light in the experiments using cyanine dye solutions, while the opposite result was obtained for the fluorescence bead snapshot (diameter: 200 nm). Magnified images of the single beads taken by a super-resolution digital CMOS camera (65 nm/pixel) revealed improved lateral resolution when S-polarized light was used on both the silver nanoparticle sheet and glass under TIRF microscopy..
11.	Shihomi Masuda, Salomé Mielke, Federico Amadei, Akihisa Yamamoto, Pangpang Wang, Takashi Taniguchi, Kenichi Yoshikawa, Kaoru Tamada, Motomu Tanaka, Nonlinear Viscoelasticity of Highly Ordered, Two-Dimensional Assemblies of Metal Nanoparticles Confined at the Air/Water Interface, Langmuir, 10.1021/acs.langmuir.8b02713, 34, 43, 13025-13034, 2018.10, In this study, we investigated the viscoelastic properties of metal nanoparticle monolayers at the air/water interface by dilational rheology under periodic oscillation of surface area. Au nanoparticles capped with oleylamine form a stable, dense monolayer on a Langmuir film balance. The stress response function of a nanoparticle monolayer was first analyzed using the classical Kelvin-Voigt model, yielding the spring constant and viscosity. The obtained results suggest that the monolayer of nanoparticles is predominantly elastic, forming a two-dimensional physical gel. As the global shape of the signal exhibited a clear nonlinearity, we further analyzed the data with the higher modes in the Fourier series expansion. The imaginary part of the higher mode signal was stronger than the real part, suggesting that the dissipative term mainly causes the nonlinearity. Intriguingly, the response function measured at larger strain amplitude became asymmetric, accompanied by the emergence of even modes. The significance of interactions between nanoparticles was quantitatively assessed by calculating the potential of mean force, indicating that the lateral correlation could reach up to the distance much larger than the particle diameter. The influence of surface chemical functions and core metal has also been examined by using Au nanoparticles capped with partially fluorinated alkanethiolate and Ag nanoparticles capped with myristic acid. The combination of dilational rheology and correlation analyses can help us precisely control two-dimensional colloidal assembly of metal nanoparticles with fine-adjustable localized surface plasmon resonance..
12.	Mamoru Tamura, Koichi Okamoto, Kaoru Tamada, Takuya Iida, Stochastic approach to simulation of evaporation-triggered multiple self-assembly of mixed metal nanoparticles and their variable superradiance, Applied Physics Letters, 10.1063/1.5005830, 112, 3, 33106, 2018.01, We developed a design principle for the evaporation-triggered heterogeneous assembly of different kinds of metal nanoparticles in a two-dimensional environment. A dynamic Monte Carlo simulation shows the formation of island structures of gold nanoparticles (gold islands) surrounded by smaller silver nanoparticles (silver matrix) during the evaporation of organic solvent from the dispersion liquid on the water surface. Our developed principle revealed the spontaneous change in multiple interactions between gold and silver nanoparticles owing to the presence or the absence of solvation repulsion, which plays a crucial role in the formation of gold islands in the silver matrix. Not only the randomly arranged gold islands, but also the surrounding silver matrix phase contributed to the wavelength-tunable light scattering enhanced by a factor of 10² due to the superradiance effect. These results will pave the way for the design of multicolored optical devices based on random plasmonics via controlled interparticle interactions..
13.	Eiji Usukura, Yuhki Yanase, Ayumi Ishijima, Thasaneeya Kuboki, Satoru Kidoaki, Koichi Okamoto, Kaoru Tamada, LSPR-mediated high axial-resolution fluorescence imaging on a silver nanoparticle sheet, PLoS One, 10.1371/journal.pone.0189708, 12, 12, 2017.12, This paper reports our original technique for visualizing cell-attached nanointerfaces with extremely high axial resolution using homogeneously excited localized surface plasmon resonance (LSPR) on self-assembled silver nanoparticle sheets. The LSPR sheet can confine and enhance the fluorescence at the nanointerface, which provides high signal-to-noise ratio images of focal adhesion at the cell-attached interface. The advantage of this LSPR-assisted technique is its usability, which provides comparable or higher-quality nanointerfacial images than TIRF microscopy, even under epifluorescence microscopy. We also report the cytotoxicity of silver nanoparticles, as determined via morphological analysis of adherent cells on the sheet..
14.	Shihomi Masuda, Yuhki Yanase, Eiji Usukura, Soh Ryuzaki, Pangpang Wang, Koichi Okamoto, Thasaneeya Kuboki, Satoru Kidoaki, Kaoru Tamada, High-resolution imaging of a cell-attached nanointerface using a gold-nanoparticle two-dimensional sheet, Scientific Reports, 10.1038/s41598-017-04000-4, 7, 1, 2017.12, This paper proposes a simple, effective, non-scanning method for the visualization of a cell-attached nanointerface. The method uses localized surface plasmon resonance (LSPR) excited homogeneously on a two-dimensional (2D) self-assembled gold-nanoparticle sheet. The LSPR of the gold-nanoparticle sheet provides high-contrast interfacial images due to the confined light within a region a few tens of nanometers from the particles and the enhancement of fluorescence. Test experiments on rat basophilic leukemia (RBL-2H3) cells with fluorescence-labeled actin filaments revealed high axial and lateral resolution even under a regular epifluorescence microscope, which produced higher quality images than those captured under a total internal reflection fluorescence (TIRF) microscope. This non-scanning-type, high-resolution imaging method will be an effective tool for monitoring interfacial phenomena that exhibit relatively rapid reaction kinetics in various cellular and molecular dynamics..
15.	Zhen Yu Juang, Chien Chih Tseng, Yumeng Shi, Wen Pin Hsieh, Soh Ryuzaki, Noboru Saito, Chia En Hsiung, Wen Hao Chang, Yenny Hernandez, Yu Han, Kaoru Tamada, Lain Jong Li, Graphene-Au nanoparticle based vertical heterostructures A novel route towards high-ZT Thermoelectric devices, Nano Energy, 10.1016/j.nanoen.2017.06.004, 38, 385-391, 2017.08, Monolayer graphene exhibits impressive in-plane thermal conductivity (> 1000 W m^–1 K^–1). However, the out-of-plane thermal transport is limited due to the weak van der Waals interaction, indicating the possibility of constructing a vertical thermoelectric (TE) device. Here, we propose a cross-plane TE device based on the vertical heterostructures of few-layer graphene and gold nanoparticles (AuNPs) on Si substrates, where the incorporation of AuNPs further inhibits the phonon transport and enhances the electrical conductivity along vertical direction. A measurable Seebeck voltage is produced vertically between top graphene and bottom Si when the device is put on a hot surface and the figure of merit ZT is estimated as 1 at room temperature from the transient Harman method. The polarity of the output voltage is determined by the carrier polarity of the substrate. The device concept is also applicable to a flexible and transparent substrate as demonstrated..
16.	Masaki Matsubara, Warren Stevenson, Jun Yabuki, Xiangbing Zeng, Haoliang Dong, Kazunobu Kojima, Shigefusa F. Chichibu, Kaoru Tamada, Atsushi Muramatsu, Goran Ungar, Kiyoshi Kanie, A Low-Symmetry Cubic Mesophase of Dendronized CdS Nanoparticles and Their Structure-Dependent Photoluminescence, Chem, 10.1016/j.chempr.2017.05.001, 2, 6, 860-876, 2017.06, A liquid crystal (LC) phase with P2₁3 symmetry, the lowest so far in a cubic LC, was obtained in a system of CdS quantum dots (QDs) modified with a two-layer corona of aliphatic thiols (inner) and LC aromatic dendrons (outer). We propose that the unusual low symmetry of this cubic mesophase is a result of the multi-layered corona, which prefers to adopt an anisotropic radial profile because of the combination of long and short “bristles.” The anisotropic distribution of dendrons (long bristles) in the P2₁3 phase is thought to facilitate π-π interaction among the aromatic moieties. The interaction gives rise to non-radiative exciton energy-transfer pathways that induce photoluminescence quenching of the CdS QDs. This is believed to be the first example of structure-dependent emission-quenching behavior..
17.	Koichi Okamoto, Daisuke Tanaka, Ryo Degawa, Xinheng Li, Pangpang Wang, Soh Ryuzaki, Kaoru Tamada, Electromagnetically induced transparency of a plasmonic metamaterial light absorber based on multilayered metallic nanoparticle sheets, Scientific Reports, 10.1038/srep36165, 6, 2016.11, In this study, we observed the peak splitting of absorption spectra for two-dimensional sheets of silver nanoparticles due to the electromagnetically induced transparency (EIT) effect. This unique optical phenomenon was observed for the multilayered nanosheets up to 20 layers on a metal substrate, while this phenomenon was not observed on a transparent substrate. The wavelength and intensities of the split peaks depend on the number of layers, and the experimental results were well reproduced by the calculation of the Transfer-Matrix method by employing the effective medium approximation. The Ag nanosheets used in this study can act as a plasmonic metamaterial light absorber, which has a such large oscillator strength. This phenomenon is a fundamental optical property of a thin film on a metal substrate but has never been observed because native materials do not have a large oscillator strength. This new type of EIT effect using a plasmonic metamaterial light absorber presents the potential for the development of future optic and photonic technologies..
18.	Pangpang Wang, Daisuke Tanaka, Shohei Araki, K. Okamoto, Kaoru Tamada, Silver nanoparticles with tunable work functions, Applied Physics Letters, 107, 151601-1-151601-5, 2015.10.
19.	Shuhei Shinohara, Daisuke Tanaka, Koichi Okamoto, Kaoru Tamada, Colorimetric plasmon sensors with multilayered metallic nanoparticle sheets, Phys. Chem. Chem. Phys., 17, 18606-18612, 2015.07.
20.	Akihito Yoshida, Keisuke Imazu, Xinheng Li, Koichi Okamoto, Kaoru Tamada, Spectroscopic Properties of Multilayered Gold Nanoparticles 2D Sheets, Langmuir, 28, 17153, 2012.11.
21.	Mana Toma, Koji Toma, Kanae Michioka, Yasuhiro Ikezoe, Daiki Obara, Koichi Okamoto and Kaoru Tamada, Collective plasmon modes excited on a silver nanoparticle 2D crystalline sheet, Phys. Chem. Chem. Phys., 10.1039/c0cp02953j, 13, 7459-7466, 2011.02.

1.	Kaoru Tamada, High Spatiotemporal Resolution Live Cell Imaging on a Plasmonic Metasurface, 13TH INTERNATIONAL CONFERENCE ON NANO-MOLECULAR ELECTRONICS (ICNME), 2022.12.
2.	Kaoru Tamada　, High Spatiotemporal Resolution Live Cell Imaging on a Plasmonic Metasurface, SPIE2022, 2022.08.
3.	Kaoru Tamada, High Axial and Lateral Resolution on Self-assembled Gold Nanoparticle Metasurfaces for Live-cell imaging, Pacifichem2021, 2021.12.
4.	Kaoru Tamada, Self-assembled nanoparticles as metasurfaces/metamaterials, ISMOA2021(online), 2021.08.
5.	Kaoru Tamada, High spatiotemporal resolution live-cell imaging on plasmonic metasurfaces, SPIE 2021, 2021.07.
6.	Kaoru Tamada, Self-Assembled Metal Nanoparticles as Metasurfaces/Metamaterials, ICMAT2019, 2019.06.
7.	Kaoru Tamada, Nano-Plasmonic Metamaterials Composed of Self-Assembled Metal Nanoparticles and Their Bio-Application, 2018 MRS Fall meeting, 2018.11.
8.	Kaoru Tamada, LSPR-mediated high axial and temporal resolution fluorescence imaging on metal nanoparticle sheet, 11th International Symposium on Modern Optics and its Applications (ISMOA 2017, 2017.08.
9.	Kaoru Tamada, Electromagnetically induced transparency of a plasmonic metamaterial light absorber based on multilayered metallic nanoparticle sheet, ICFPAM2016, 2016.11.
10.	Kaoru Tamada, Dimensional Optical Property of Self-assembled Metallic Nanoparticles, Pacifichem2015, 2015.12.
11.	Kaoru Tamada, Shihomi Masuda, Ayumi Ishijima, Eiji Usukura, Koichi Okamoto, Self-assembled Metallic Nanoparticles for Bioimaging, KJF-ICOMEP2015, 2015.09.
12.	Kaoru Tamada, Eiji Usukura, Shihomi Masuda, Koichi Okamoto, Daisuke Tanaka, Yuhki Yanase, High Contrast and High Resolution Cell Imaging by use of Metallic Nanoparticle 2D sheet, ICMAT 2015 & IUMRS-ICA 2015, 2015.07.
13.	Kaoru Tamada, Plasmonic Property of Multidimensional Self-assembled Metallic Nanoparticles, 第17回微粒子と無機クラスターに関する国際シンポジウム(ISSPIC XVII), 2014.09.
14.	Kaoru Tamada, Dimensional Optical Property of Self-assembled Metallic Nanoparticles, The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014), 2014.08.