Details of a Researcher - Iwasaki, Suguru

Iwasaki, Suguru

写真a

Affiliation: Faculty of Science and Technology, Department of Applied Physics and Physico-Informatics ( Yagami )

Position: Assistant Professor/Senior Assistant Professor

E-mail Address

Related Websites

https://iwasaki-suguru.appi.keio.ac.jp

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Career 【 Display / hide 】

2020.04

-

2023.03

Hokkaido University, Research Institute for Electronic Science, 博士研究員
2023.04

-

2026.03

Tokyo University of Science, Faculty of Engineering Industrial Chemistry, 助教
2026.04

-

Present

Keio University, Faculty of Science and Technology Department of Applied Physics and Physico-Informatics, 専任講師

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Academic Background 【 Display / hide 】

2011.04

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2013.09

Keio University, Faculty of Science and Technology
2013.09

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2015.08

École Centrale de Nantes

France
2015.09

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2017.08

Keio University, Graduate School of Science and Technology, 前期博士課程
2017.09

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2020.03

慶應義塾大学大学院, 理工学研究科, 後期博士課程

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Research Areas 【 Display / hide 】

Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

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Research Keywords 【 Display / hide 】

イオンの固体間拡散
機能性材料 (固体電解質・エレクトレット・熱電・超伝導)
高圧化学
高圧固体イオニクス

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Papers 【 Display / hide 】

Introduction of Ag ions into 2H-MoTe 2 via high-pressure diffusion control method

Suguru Iwasaki, Melbert Jeem, Akitoshi Nakano, Masaya Fujioka

Dalton Transactions (Royal Society of Chemistry (RSC)) 55 ( 12 ) 4772 - 4779 2026.03

Accepted, ISSN 14779226

　View Summary

Transition Metal Dichalcogenides (TMDs) are a major family of compounds for exploring functional materials through intercalation. In this study, the intercalation of Ag ions into 2H-MoTe 2 using the high-pressure diffusion...
- Access to Document (DOI)
A study on the cryogenic thermal shock behavior of 304 and 316 stainless steels: Impact of cyclic thermal stress on phase stability and surface degradation

Jeongwoo Heo, Suguru Iwasaki, Yumi Tanaka

Materials Today Communications (Elsevier BV) 52 115221 - 115221 2026.03

Lead author, Last author, Corresponding author, Accepted, ISSN 2352-4928
- Access to Document (DOI)
Compositional tuning in NaxAlB₁₄ via diffusion control

Mihiro Hoshino, Suguru Iwasaki, Shigeto Hirai, Yoshihiko Ihara, Tohru Sugahara, Haruhiko Morito, Masaya Fujioka

Journal of Alloys and Compounds (Elsevier BV) 1039 183072 - 183072 2025.09

Accepted, ISSN 09258388

　View Summary

A uniform Na distribution in NaₓAlB₁₄ was achieved using high-pressure diffusion control (HPDC), which promotes Na deintercalation through enhanced diffusion under high pressure, combined with post-annealing. NaₓAlB₁₄ with a non-stoichiometric Na composition is thermodynamically metastable, and conventional solid-state reactions with adjusted starting compositions typically result in the formation of stoichiometric NaAlB₁₄ and side products. While HPDC alone typically leads to concentration gradients, intentionally halting the Na removal process before complete extraction, followed by annealing, enabled a uniform composition across the bulk. This allowed structural and electronic properties to be examined over a wide range of Na concentrations. As Na content decreased, electrical conductivity increased, and the optical band gap narrowed. NMR measurements showed an increase in the density of states at the Fermi level, consistent with DFT calculations predicting boron-related in-gap states. Boron vacancies at specific sites were found to generate deep levels near the band gap center, which can explain experimentally observed optical gap reduction. These results demonstrate that diffusion-controlling methods can be effectively applied to synthesize metastable compounds with tunable compositions in covalent frameworks. Furthermore, they provide a foundation for designing functional boride-based materials with adjustable electronic properties by controlling Na extraction and inducing defect formation.
- Access to Document (DOI)
Fitting of nonnegative physical models based on statistical divergence: application to thermally stimulated depolarization currents

Yasunobu Ando, Shusuke Kasamatsu, Suguru Iwasaki, Yumi Tanaka

Science and Technology of Advanced Materials: Methods (Informa UK Limited) 5 ( 1 ) 2441102 2025.01

Lead author, Last author, Corresponding author, Accepted
- Access to Document (DOI)
Hydrogen-Assisted Mg Intercalation into 2H-TaS2

Masaya Fujioka, Khurelbaatar Zagarzusem, Suguru Iwasaki, Aman Sharma, Konosuke Watanabe, Rei Nakayama, Mizuki Momai, Yuki Yamaguchi, Hiroyuki Shimada, Katsuhiro Nomura, Yasunobu Mizutani, Hirofumi Sumi, Masashi Tanaka, Melbert Jeem, Mineyuki Hattori, Hiroyuki Saitoh, Toshinori Ozaki, Masanori Nagao, Kazuki Nagashima

Journal of the American Chemical Society (American Chemical Society (ACS)) 146 ( 50 ) 34324 - 34332 2024.12

Accepted, ISSN 00027863

　View Summary

Intercalation reactions are highly dependent on the electronic and structural relationships between host and guest materials. It is difficult for divalent ions, such as Mg, to undergo intercalation reactions compared with monovalent cations. However, further development of synthetic techniques for controlling divalent ions is strongly demanded to advance applied chemistry and fundamental physics. In this study, the cointercalation of Mg and H into the transition-metal chalcogenide TaS<inf>2</inf> was utilized to obtain bulk polycrystalline Mg<inf>x</inf>H<inf>y</inf>TaS<inf>2</inf>. Introduced H can be extracted via postannealing at approximately 400 °C without altering the crystal structure. This study clarified the relationship between superconducting properties and electronic carrier density from the perspectives of calculations and experiments, along with the advantages of using hydride as a multivalent intercalation reaction.
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Research Projects of Competitive Funds, etc. 【 Display / hide 】

イオン導入と酸素欠損の協奏効果に基づく熱伝導率制御

2026.04

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2027.03

公益財団法人 JKA, 2026年度競輪とオートレースの補助事業機械振興に資する研究 (一般), Principal investigator
異方的イオン拡散制御に基づく多価カチオンのインターカレーション

2025.04

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2026.03

豊田理化学研究所, 2025年度豊田理研スカラー, Principal investigator
異方的イオン拡散制御に基づく元素選択的回収技術

2025.04

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2026.03

公益財団法人 JKA, 2025年度競輪とオートレースの補助事業機械振興に資する研究 (若手), Principal investigator
高圧を利用したセラミックスの焼結とイオン伝導特性の制御

2025.01

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2025.12

大倉和親記念財団, 若手研究者部門, Principal investigator
異方的イオン拡散制御に基づく巨大イオンの層間導入技術の創製

2024.07

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2025.06

公益財団法人村田学術振興・教育財団, 2024年度第40回研究助成, Principal investigator