Takeo Ohsawa

Profile Information

Affiliation: 主幹研究員, 機能性材料研究拠点, 国立研究開発法人物質・材料研究機構

Degree: 博士（工学）(東京工業大学)

ORCID ID: https://orcid.org/0000-0001-7528-8940
J-GLOBAL ID: 201801019661578654
Researcher ID: A-5373-2010
researchmap Member ID: B000346167

External link: https://samurai.nims.go.jp/profiles/ohsawa_takeo

Research Areas

Research History

Apr, 2019 - Present

Principal Researcher, National Institute for Materials Science (NIMS)
Apr, 2013 - Mar, 2019

Senior Researcher, National Institute for Materials Science (NIMS)
Apr, 2009 - Mar, 2013

Assistant Professor, Advanced Institute for Materials Research, Tohoku University
Jun, 2007 - Mar, 2009

Postdoctorate Research Associate, Pacific Northwest National Laboratory (PNNL)
Apr, 2006 - May, 2007

Postdoctoral researcher, National Institute for Materials Science (NIMS)

Committee Memberships

May, 2019 - Present

協会誌編集委員会, 日本セラミックス協会

Awards

Oct, 2013

第33回エレクトロセラミックス研究討論会最優秀賞, 日本セラミックス協会

大澤健男
Sep, 2013

Best Poster Award, Workshop on Oxide Electronics 20

Takeo Ohsawa
Sep, 2002

応用物理学会講演奨励賞, 応用物理学会

大澤健男

Papers

103

Local Magnetism in the Spin-singlet State of VO₂

Hirotaka Okabe, Masatoshi Hiraishi, Akihiro Koda, Yoshitaka Matsushita, Takeo Ohsawa, Naoki Ohashi, Ryosuke Kadono

Proceedings of the 29th International Conference on Low Temperature Physics (LT29), May 22, 2023
Electronic transport properties of GeS single crystals grown by vapor transport from molten GeS source

Masaru Nakamura, Encarnación G. Víllora, Takeo Ohsawa, Kiyoshi Shimamura, Naoki Ohashi

Journal of Crystal Growth, May, 2023 Peer-reviewed
Local electronic structure of dilute hydrogen in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>β</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>Ga</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> probed by muons

M. Hiraishi, H. Okabe, A. Koda, Ryosuke Kadono, Takeo Ohsawa, Naoki Ohashi, Keisuke Ide, T. Kamiya, H. Hosono

Physical Review B, 107(4), Jan 18, 2023
Ru-implanted WS2 nanosheet gas sensors to enhance sensing performance towards CO gas in self-heating mode

Jae-Hun Kim, Isao Sakaguchi, Shunich Hishita, Takeo Ohsawa, Taku T. Suzuki, Noriko Saito

Sensors and Actuators B: Chemical, 370 132454-132454, Nov, 2022
Electrical properties of zinc nitride and zinc tin nitride semiconductor thin films toward photovoltaic applications

Yong Wang, Takeo Ohsawa, Fahad Alnjiman, Jean-Francois Pierson, Naoki Ohashi

HIGH TEMPERATURE MATERIALS AND PROCESSES, 41(1) 343-352, May, 2022
A facile route to fabricating a crack-free Mg_0.99Cu_0.01Ag_0.97Sb_0.99/graphene/PEDOT:PSS thermoelectric film on a flexible substrate

Yanan Wang, Raju Chetty, Zihang Liu, Longquan Wang, Takeo Ohsawa, Weihong Gao, Takao Mori

Journal of Materials Chemistry C, 10(35) 12610-12620, 2022
Crystal structure of formamidinium–lead–chloride–dimethyl sulfoxide and phase relationship of related crystalline systems

Noriko SAITO, Yoshitaka Matsushita, Takeo Ohsawa, Hiroyo SEGAWA, Naoki Ohashi

CrystEngComm, 24(45) 7996-8004, 2022
Atomic-scale growth, imaging, spectroscopy, and electronic transport properties of metal-oxide films and interfaces

Takeo Ohsawa

Journal of Vacuum Science & Technology A, 40(1) 010806-010806, Jan, 2022
Reentrant structural and optical properties of organic–inorganic hybrid metal cluster compound ((n-C4H9)4N)2[Mo6Bri8Bra6]

Norio Saito, Daiki Nishiyama, Yoshitaka Matsushita, Yoshiki Wada, St{\'{e } }phane Cordier, Takeo Ohsawa, Fabien Grasset, Naoki Ohashi

CrystEngComm, 2022
Chemothermal pulverization: Crushing titanate crystals to obtain nanosized powders via high‐temperature treatment

Naoki Ohashi, Yoshio Matsui, Hiroyo Segawa, Noboru Tanida, Satoshi Nagaso, Masaya Nishida, Ichitaro Okamura, Yuta Osawa, Alfian Noviyanto, Benjamin Soulie …

Journal of the American Ceramic Society, Nov 10, 2021
Synthesis of bulk silicon oxynitride glass through nitridation of SiO 2 aerogels and determination of T g

Yuta Osawa, Kenichiro Iwasaki, Takayuki Nakanishi, Atsuo Yasumori, Yoshio Matsui, Toshiyuki Nishimura, Takeo Ohsawa, Hiroyo Segawa, Naoki Ohashi

Journal of the American Ceramic Society, 104(9) 4420-4432, Sep, 2021
Investigation of Temperature-Dependent Hard X-ray Photoemission Spectra on Au/Nb:SrTiO3 Schottky Junctions

Takeo Ohsawa, Taisei Murakami, Takumi Hosaka, Shigenori Ueda, Takamasa Ishigaki, Naoki Ohashi

The Journal of Physical Chemistry C, 125(27) 14836-14842, Jul 15, 2021
Ultrafine self-N-doped porous carbon nanofibers with hierarchical pore structure utilizing a biobased chitosan precursor

L{\'{a } }szl{\'{o } } Szab{\'{o } }, Xingtao Xu, Takeo Ohsawa, Koichiro Uto, Joel Henzie, Izumi Ichinose, Mitsuhiro Ebara

International Journal of Biological Macromolecules, 182 445-454, Jul, 2021
Local electronic structure of dilute hydrogen in β−MnO2

H. Okabe, M. Hiraishi, A. Koda, S. Takeshita, K. M. Kojima, I. Yamauchi, T. Ohsawa, N. Ohashi, H. Sato, R. Kadono

Physical Review B, 103(15), Apr 13, 2021
Structural and electronic properties of the metal cluster-based compounds including high concentration of solvent molecules

Saito, Norio, Lemoine, Pierric, Cordier, Stéphane, Matsushita, Yoshitaka, Ohsawa, Takeo, Grasset, Fabien, Cross, Jeffrey Scott, Ohashi, Naoki

Zeitschrift für anorganische und allgemeine Chemie, n/a(n/a), Feb 17, 2021
Growth of Large Single Crystals of n-Type SnS from Halogen-Added Sn Flux

Sakiko Kawanishi, Issei Suzuki, Takeo Ohsawa, Naoki Ohashi, Hiroyuki Shibata, Takahisa Omata

Crystal Growth & Design, 20(9) 5931-5939, Sep 2, 2020
Origin of Optical Transparency in a Transparent Superconductor LiTi2O4

ACS Applied Electronic Materials, Feb 25, 2020 Peer-reviewed
Suppressing the carrier concentration of zinc tin nitride thin films by excess zinc content and low temperature growth

Applied Physics Letters, Dec, 2019 Peer-reviewed
Extraordinary quasi-two-dimensional magnetotransport properties of a LaAlO<inf>3</inf>/SrTiO<inf>3</inf> heterostructure tailored with a surface TiO<inf>2</inf> atomic sheet

Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki, Tsutomu Nojima, Taro Hitosugi

Applied Physics Letters, 115(20), Nov 11, 2019 Peer-reviewed
Silicon-compatible Mg2Si/Si n-p photodiodes with high room temperature infrared responsivity

Ahmed A.M. El-Amir, Takeo Ohsawa, Satoshi Ishii, Masataka Imura, Meiyong Liao, Xiuwei Fu, Hiroyo Segawa, Isao Sakaguchi, Tadaaki Nagao, Kiyoshi Shimamura …

Materials Science in Semiconductor Processing, 102, Nov, 2019 Peer-reviewed

Misc.

直線偏光制御を用いた硬X 線光電子分光による極性GaN 結晶の電子状態研究

大澤健男, 上田茂典, 鈴木基寛, 大橋直樹

SPring-8/SACLA利用者情報, 22 227-232, Aug, 2017 Invited
La_0.7Ca_0.3MnO₃薄膜表面における構造・電子状態の原子スケール観察

清水亮太, 岩谷克也, 大澤健男, 中村俊也, 安藤康伸, 南谷英美, 渡邉聡, 一杉太郎

応用物理学会秋季学術講演会講演予稿集(CD-ROM), 75th ROMBUNNO.19P-A10-9, Sep 1, 2014
La_0.75Ca_0.25MnO₃薄膜表面における構造・電子状態の第一原理計算

中村俊也, 安藤康伸, 南谷英美, 清水亮太, 岩谷克也, 大澤健男, 一杉太郎, 渡邉聡

応用物理学会秋季学術講演会講演予稿集(CD-ROM), 75th ROMBUNNO.19P-A10-10, Sep 1, 2014
STM/STSを用いたLa_0.7Ca_0.3MnO₃薄膜表面の構造・電子状態評価 I(実験)

清水亮太, 岩谷克也, 大澤健男, 中村俊也, 安藤康伸, 南谷英美, 渡邉聡, 一杉太郎

日本物理学会講演概要集, 69(2) 638, Aug 22, 2014
STM/STSを用いたLa_0.7Ca_0.3MnO₃薄膜表面の構造・電子状態評価 II(理論)

中村俊也, 安藤康伸, 南谷英美, 清水亮太, 岩谷克也, 大澤健男, 一杉太郎, 渡邉聡

日本物理学会講演概要集, 69(2) 638, Aug 22, 2014
7pAS-4 Atomic and electronic structure investigation on La_<0.7>Ca_<0.3>MnO_3 thin film by STM/STS II (theory)

Nakamura Shunya, Ando Yasunobu, Minamitani Emi, Shmizu Ryota, Iwaya Katsuya, Ohsawa Takeo, Hitosugi Taro, Watanabe Satoshi

Meeting Abstracts of the Physical Society of Japan, 69 638-638, 2014
7pAS-3 Atomic and electronic structure investigation on La_<0.7>Ca_<0.3>MnO_3 thin film by STM/STS I (experiment)

Shimizu R, Iwaya K, Ohsawa T, Nakamura S, Ando Y, Minamitani E, Watanabe S, Hitosugi T

Meeting Abstracts of the Physical Society of Japan, 69 638-638, 2014
In situ investigation of oxide thin film growth using scanning tunneling microscopy.

一杉太郎, 清水亮太, 大澤健男, 岩谷克也

応用物理, 82(2) 141-145, Feb 10, 2013
LiCoO₂エピタキシャル薄膜における結晶粒界の界面抵抗

熊谷明哉, 大澤健男, 清水亮太, 鈴木竜, 高木由貴, 白木将, 森分博紀, 幾原雄一, 幾原雄一, 幾原雄一 …

固体イオニクス討論会講演要旨集, 38th, 2012
LiCoO₂エピタキシャル薄膜の電気伝導性におよぼす結晶粒界の寄与

熊谷明哉, 大澤健男, 鈴木竜, 高木由貴, 白木将, 大木栄幹, 大木栄幹, 森分博紀, 幾原雄一, 幾原雄一 …

応用物理学関係連合講演会講演予稿集(CD-ROM), 59th, 2012
LiCoO₂エピタキシャル薄膜の伝導特性に与える結晶粒界の寄与

熊谷明哉, 大澤健男, 鈴木竜, 高木由貴, 白木将, 大木栄幹, 大木栄幹, 森分博紀, 幾原雄一, 幾原雄一 …

電気化学会大会講演要旨集, 79th, 2012
Initial Growth Process of Perovskite Oxide Thin Films

大澤健男, 岩谷克也, 清水亮太, 一杉太郎

表面科学, 33(6) 357-362 (J-STAGE)-362, 2012
Atomic-Scale Observation of Initial Growth Process of Homoepitaxial SrTiO_3 Thin Films

IWAYA Katsuya, OHSAWA Takeo, SHIMIZU Ryota, HITOSUGI Taro

X-RAYS, 53(5) 353-358, Nov, 2011 Invited
24aGM-2 Local electronic structures of SrO-terminated SrTiO_3(001) surfaces by STM/STS

Iwaya K., Ohsawa T., Shimizu R., Hitosugi T.

Meeting abstracts of the Physical Society of Japan, 66(2) 646-646, Aug 24, 2011
24aGM-1 Local electronic structures of TiO_2-terminated SrTiO_3(001) surfaces by STM/STS

Iwaya K., Ohsawa T., Shimizu R., Hitosugi T.

Meeting abstracts of the Physical Society of Japan, 66(2) 646-646, Aug 24, 2011
LiCoO2エピタキシャル薄膜の成膜と物性評価

一杉太郎, 白木将, 大澤健男, 熊谷明哉, 大木栄幹

FC Report, 29 108-109, 2011
25pWB-12 Investigation of atomically-ordered SrTiO_3(001)-(√<13>×√<13>) reconstructed surface

Shimizu R., Iwaya K., Ohsawa T., Hasegawa T., Hashizume T., Hitosugi T.

Meeting abstracts of the Physical Society of Japan, 65(2) 598-598, Aug 18, 2010
21aGE-3 STM/STS studies on the electronic structure of SrTiO_3 thin films

Hitosugi T., Iwaya K., Ohsawa T., Shimizu R., Hashizume T.

Meeting abstracts of the Physical Society of Japan, 65(1) 593-593, Mar 1, 2010
(Mg,Zn)/ZnO heterostructures prepared by pulsed laser deposition

ADACHI, Yutaka, OHASHI, Naoki, SAKAGUCHI, Isao, OHSAWA, Takeo, RYOKEN, Haruki, YOSHIKAWA, Hideki, UEDA, Shigenori, KOBAYASHI, Keisuke, HANEDA, Hajime

KEY ENGINEERING MATERIALS, 3-6, Aug 1, 2008 Peer-reviewed
High-throughput Studies on Photochemical Properties of Transition Metal-Doped SrTiO₃ Epitaxial Thin Films

T. Ohsawa, H. Koinuma, Y. Matsumoto

Proc.of MRS Fall Meeting, 894 LL03-18.1, 2006

Books and Other Publications

超伝導現象と高温超伝導体

(Role: Contributor, 透明超伝導体の開発)

エヌティーエス, Mar, 2013 (ISBN: 486469057X)
コンビナトリアルテクノロジー―明日を開く“もの作り”の新世界

鯉沼秀臣, 川崎雅司 (Role: Contributor, コンビナトリアルSTM)

丸善, Aug, 2004 (ISBN: 4621074474)

Professional Memberships

Research Projects

Metal oxyhidride epitaxy and creation of fascinating electronic/dielectric properties

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2021 - Mar, 2024
Investigation of fascinating conductivity at superstructure interfaces using oxide atomic sheets

Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (A), Japan Society for the Promotion of Science, Apr, 2016 - Mar, 2019

Ohsawa Takeo
Low-dimensional Electronic Order Formed at Artificial Perovskite Titanate Interfaces

Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Japan Society for the Promotion of Science, 2010 - 2011

OHSAWA Takeo

Profile Information

Research Areas

Research History

Committee Memberships

Awards

Papers

Misc.

Books and Other Publications

Professional Memberships

Research Projects

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