Faculty Profiles - MUTO, Shunsuke

Papers - MUTO, Shunsuke

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低カウントのスペクトラムイメージ解析のための機械学習法 Reviewed

志賀元紀, 武藤俊介

顕微鏡 Vol. 57 ( 2 ) page： 65 - 69 2022

先端材料開発に向けた，AI先端計測技術の多角的視点からの考察(第2回) Reviewed

岡本和也, 杉山昌章, 武藤俊介, 青柳里果, 冨谷茂隆

日本金属学会会報「まてりあ」 Vol. 61 ( 9 ) page： 579 - 587 2022

Structural and chemical modifications of oxides and OH generation by space weathering: Electron microscopic/spectroscopic study of hydrogen-ion-irradiated Al2O3 Reviewed

Y. Igami, S. Muto, A. Takigawa, M. Ohtsuka, A. Miyake, K. Suzuki, K. Yasuda, A. Tsuchiyama

Geochimica et Cosmochimica Acta 2021.12

Dynamics of Rh Nanoparticle Surface Structure during NO Reduction Revealed by Operando Transmission Electron Microscopy Reviewed

H. Tanaka, K. Orita, A. Maede, H. Ishikawa, M. Miura, S. Arai, T. Higuchi, S. Ohta, S. Muto

Applied Catalysis A: General 2021.9

Preparation of silver-decorated Soluplus (R) nanoparticles and antibacterial activity towards S. epidermidis biofilms as characterized by STEM-CL spectroscopy Reviewed

Takahashi Chisato, Yamada Tomomi, Yagi Shinya, Murai Takaaki, Muto Shunsuke

MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS Vol. 121 page： 111718 2021.2

次元削減法とそのスペクトル解析への応用 Reviewed

武藤俊介, 志賀元紀

日本鉄鋼協会「ふぇらむ」 Vol. 26 ( 7 ) page： 32-40 2021

Electron and Ion Transfer across Interfaces of the NASICON-Type LATP Solid Electrolyte with Electrodes in All-Solid-State Batteries: A Density Functional Theory Study via an Explicit Interface Model Reviewed International coauthorship International journal

Hong-Kang Tian, Randy Jalem, Bo Gao, Yuta Yamamoto, Shunsuke Muto, Miyuki Sakakura, Yasutoshi Iriyama, Yoshitaka Tateyama

ACS APPLIED MATERIALS & INTERFACES Vol. 12 ( 49 ) page： 54752 - 54762 2020.12

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

NASICON-type oxide Li1+xAlxTi2-x(PO4)(3)(LATP) is expected to be a promising solid electrolyte (SE) for all-solid-state batteries (ASSBs) owing to its high ion conductivity and chemical stability. However, its interface properties with electrodes on the atomic scale remain unclear, but it is crucial for rational control of the ASSBs performance. Herein, we focused on the LATP SE with x = 0.17 and investigated the electron and ion transfer behaviors at the interfaces with the Li metal negative electrode and the LiCoO2 (LCO) positive electrode via explicit interface models and density functional theory calculations. Ti reduction was found at the LATP/Li interface. For the LATP/LCO interface, the results indicated the Li-ion transfer from LCO to LATP upon contact until a certain electric double layer is formed under equilibrium, in which LCO is partially reduced. Co-Ti exchange was also found to be favorable where the Li ion moves with Co3+ to LATP. We also explored the possible interfacial processes during annealing by simulating the oxygen removal effect and found that oxygen vacancy can be more easily formed in the LCO at the interface. It implies that partial Li ions move back to LCO for the local charge neutrality. We also demonstrated higher Li chemical potential around the LATP/LCO interfaces, leading to the dynamical Li-ion depletion upon charging. The calculation results and the deduced mechanisms well explain the experimental results so far and provide insights into the interfacial electron and ion transfer upon contact, during annealing, and charging.

DOI： 10.1021/acsami.0c16463

Web of Science

Core–Shell Double Doping of Zn and Ca on β-Ga 2 O 3 Photocatalysts for Remarkable Water Splitting Reviewed

Vol. 11 page： 1911 - 1919 2020.12

スペクトラムイメージデータのノイズ処理と信号抽出の最近の進展 Invited Reviewed

武藤俊介, 志賀元紀

顕微鏡 Vol. 55 ( 2 ) page： 60 - 64 2020.8

Application of machine learning techniques to electron microscopic/spectroscopic image data analysis Invited Reviewed

Muto Shunsuke, Shiga Motoki

MICROSCOPY Vol. 69 ( 2 ) page： 110 - 122 2020.4

Evolution from UV emission of phenyl groups to visible emission of pyrolytic nanocarbons dispersed in fumed silica: Alternative insight into photoluminescence of carbon nanodots

Vasin A. V, Muto S, Ishikawa Y, Kysil D. V, Sevostianov S. V, Isaieva O. F, Rudko G. Yu, Yatskiv R, Starik S, Tertykh V. A, Nazarov A. N, Lysenko V. S

JOURNAL OF LUMINESCENCE Vol. 219 page： 116926 - 116926 2020.3

Measurement of nanoscale local stress distribution in phase-separated glass using scanning transmission electron microscopy-cathodoluminescence

Yamada Taiki, Ohtsuka Masahiro, Takahashi Yoshimasa, Yoshino Haruhiko, Amma Shin-ichi, Muto Shunsuke

MATERIALIA Vol. 9 2020.3

Methods for Calibration of Specimen Temperature During In Situ Transmission Electron Microscopy Experiments

Gaulandris Fabrizio, Simonsen Soren B, Wagner Jakob B, Molhave Kristian, Muto Shun, Kuhn Luise T

MICROSCOPY AND MICROANALYSIS Vol. 26 ( 1 ) page： 3 - 17 2020.2

STEM-EELS analysis of the interface structures of composite ASS-LIB electrodes fabricated via aerosol deposition

Yamamoto Yuta, Iriyama Yasutoshi, Muto Shunsuke

JOURNAL OF THE AMERICAN CERAMIC SOCIETY Vol. 103 ( 2 ) page： 1454 - 1462 2020.2

Single-pass STEM-EMCD on a zone axis using a patterned aperture: progress in experimental and data treatment methods

Thersleff Thomas, Schonstrom Linus, Tai Cheuk-Wai, Adam Roman, Burgler, Daniel E, Schneider Claus M, Muto Shunsuke, Rusz Jan

SCIENTIFIC REPORTS Vol. 9 2019.12

Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes International journal

Zhang Zhujun, Karimata Izuru, Nagashima Hiroki, Muto Shunsuke, Ohara Koji, Sugimoto Kunihisa, Tachikawa Takashi

NATURE COMMUNICATIONS Vol. 10 ( 1 ) page： 4832 - 4832 2019.10

Language：Japanese Publishing type：Research paper (scientific journal)

Hematite (α-Fe2O3) is one of the most promising candidates as a photoanode materials for solar water splitting. Owing to the difficulty in suppressing the significant charge recombination, however, the photoelectrochemical (PEC) conversion efficiency of hematite is still far below the theoretical limit. Here we report thick hematite films (∼1500 nm) constructed by highly ordered and intimately attached hematite mesocrystals (MCs) for highly efficient PEC water oxidation. Due to the formation of abundant interfacial oxygen vacancies yielding a high carrier density of ∼1020 cm-3 and the resulting extremely large proportion of depletion regions with short depletion widths (<10 nm) in hierarchical structures, charge separation and collection efficiencies could be markedly improved. Moreover, it was found that long-lived charges are generated via excitation by shorter wavelength light (below ∼500 nm), thus enabling long-range hole transfer through the MC network to drive high efficiency of light-to-energy conversion under back illumination.

DOI： 10.1038/s41467-019-12581-z

Web of Science

PubMed

Non-negative Matrix Factorization and Its Extensions for Spectral Image Data Analysis

Shiga Motoki, Muto Shunsuke

E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY Vol. 17 page： 148 - 154 2019.9

Environmental high-voltage S/TEM combined with a quadrupole mass spectrometer for concurrent in situ structural characterization and detection of product gas molecules associated with chemical reactions Reviewed

S. Muto, S. Arai, T. Higuchi, K. Orita, S. Ohta, H. Tanaka, T. Suganuma, M. Ibe, H. Hirata

Microscopy Vol. 68 ( 2 ) page： 185 - 188 2019.4

Proposal for Measuring Magnetism with Patterned Apertures in a Transmission Electron Microscope Reviewed

S. Muto, S. Arai, T. Higuchi, K. Orita, S. Ohta, H. Tanaka, T. Suganuma, M. Ibe, H. Hirata

PHYSICAL REVIEW LETTERS Vol. 122 ( 3 ) page： 037201 2019.1

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：AMER PHYSICAL SOC

We propose a magnetic measurement method utilizing a patterned postsample aperture in a transmission electron microscope. While utilizing electron magnetic circular dichroism, the method circumvents previous needs to shape the electron probe to an electron vortex beam or astigmatic beam. The method can be implemented in standard scanning transmission electron microscopes by replacing the spectrometer entrance aperture with a specially shaped aperture, hereafter called a ventilator aperture. The proposed setup is expected to work across the whole range of beam sizes-from wide parallel beams down to atomic resolution magnetic spectrum imaging.

DOI： 10.1103/PhysRevLett.122.037201

Web of Science

Analysis of evolution of electron-radiation-induced defects in white-luminescent, carbonized,mesoporous silica nanocomposite using transmission electron microscopy/cathodoluminescence Reviewed

K. Oguni, K. Sato, Y. Ishii, Y. Ishikawa, S. Kawasaki, A. Vasin, S. Muto

Nuclear Inst. And Methods in Physics Research B Vol. 439 page： 22 - 33 2019.1

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ELSEVIER

We examined the evolution of electron-radiation-induced defects in a white-luminescent, carbonized, mesoporous silica nanocomposite using cathodoluminescence (CL) and electron energy-loss spectroscopy associated with scanning transmission electron microscopy, in order to elucidate the microscopic origins of light emissions in the visible spectral range. The effects of electron irradiation on CL were analyzed based on the differential equations for kinetics of irradiation defects. The nanometric honeycomb silica framework was found to play essentially no role in the electron-excited light emission processes, in contrast to the case for photon-excited processes. The broad and continuous visible emission band in CL consisted of several luminescence components, that have been assigned to optically active point defects such as oxygen-deficient centers, and surface non-bridging oxygen hole centers (NBOHCs) in silica glass.

DOI： 10.1016/j.nimb.2018.11.007

Web of Science

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Papers - MUTO, Shunsuke