研究者詳細 - 長田　実

論文 - 長田　実

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Thermal and Chemical Phase Engineering of Two-Dimensional Ruthenate 査読有り

Leanddas Nurdiwijayanto, Kensuke Hayashi, Nobuyuki Sakai, Yasuo Ebina, Dai-Ming Tang, Shigenori Ueda, Minoru Osada, Kazuhito Tsukagoshi, Takayoshi Sasaki, Takaaki Taniguchi

ACS Nano 17 巻 ( 13 ) 頁： 12305 - 12315 2023年6月

Free-Standing Molecularly Thin Amorphous Silica Nanosheets 査読有り

Yamamoto, E; Fujihara, K; Takezaki, Y; Ito, K; Shi, Y; Kobayashi, M; Osada, M

SMALL 19 巻 ( 22 ) 頁： e2300022 - 2300022 2023年6月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Small

Recent progress in 2D materials has initiated new fields of molecularly thin amorphous materials with mysterious properties and structures. However, designed synthesis of molecularly thin amorphous silica still remains a challenge; whether free-standing molecularly thin amorphous silica nanosheets can exist is unclear. Here, this issue is addressed by using a new chemical protocol; solid-state surfactant lamellae with ordered alkyl-chain arrangements can serve as superior templates guiding free-standing amorphous silica nanosheets. Simple sonication of the lamellar hybrids allows exfoliation into monolayer amorphous silica nanosheets with 0.9 nm thickness. In addition, the nanosheets show the distinctive feature of high colloidal stability that enables atomic layer engineering of silica nanocoatings and dielectric nanofilms. The approach may shed new light on the properties and applications of old silica.

DOI： 10.1002/smll.202300022

Web of Science

Scopus

PubMed

その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/smll.202300022

Layer-dependent stability of 2D mica nanosheets 査読有り国際共著

Jae-Hun Kim, Vadym V Kulish, Shunnian Wu, Ping Wu, Yue Shi, Minoru Osada, Hyoun Woo Kim, Sang Sub Kim

Scientific Reports 13 巻頁： 7880 2023年5月

2D bismuth oxyfluorides: a new member of cationic nanosheets 査読有り

M. Kobayashi, T. Tasaka, E. Yamamoto, M. Osada

Chem. Lett. 52 巻 ( 6 ) 頁： 449 - 451 2023年4月

Pseudo-topotactic Transformation from Oxide Nanosheets to Amorphous Nanosheets 査読有り

Sugimoto, H; Kobayashi, M; Yamamoto, E; Osada, M

CHEMISTRY LETTERS 52 巻 ( 5 ) 頁： 322 - 324 2023年4月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Chemistry Letters

We demonstrated the synthesis of amorphous oxide nanosheets from crystalline nanosheets prepared by the exfoliation of layered compounds. Single-crystalline oxide nanosheets were calcined with C3N4 powder in flowing nitrogen and annealed in air to produce amorphous oxide nanosheets. The cation composition and valence, shape, lateral size, surface roughness, and thickness were not changed by treatment. This approach enables the production of amorphous oxide nanosheets with distinct morphologies and compositions and large lateral sizes.

DOI： 10.1246/cl.230073

Web of Science

Scopus

Molecularly Thin BaTiO3 Nanosheets with Stable Ferroelectric Response 査読有り国際共著

Kazuki Hagiwara, Ki Nam Byun, Shu Morita, Eisuke Yamamoto, Makoto Kobayashi, Xioyang Liu, Minoru Osada

Advanced Electronic Materials 9 巻 ( 4 ) 頁： 2201239 2023年4月

Composite design of two-dimensional inorganic nanosheets for flexible energy storage capacitors 査読有り

Ki-Nam Byun, Yue Shi, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

Journal of the Ceramic Society of Japan 131 巻 ( 4 ) 頁： 77 - 82 2023年4月

Automated One-Drop Assembly for Facile 2D Film Deposition 査読有り

Yue Shi, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

ACS Applied Materials & Interfaces 15 巻 ( 18 ) 頁： 22737 - 22743 2023年3月

Damage-free LED lithography for atomically thin 2D material devices 査読有り

13 巻頁： 2583 2023年2月

Improved energy storage performance of PVDF nanocapacitors by utilizing 2D inorganic barrier 査読有り

Byun Ki-Nam, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

Chemistry Letters 52 巻 ( 1 ) 頁： 51 - 54 2023年1月

Advances in dielectric performance of atomically engineered Sr1. 8Bi0. 2Nb3O10 perovskite nanosheet thin films 査読有り国際共著

Haena Yim, So Yeon Yoo, Haneul Choi, Hye Jung Chang, Seong-Ju Hwang, Sahn Nahm, Minoru Osada, Ji-Won Choi

Journal of Alloys and Compounds 925 巻頁： 166606 2022年12月

Tailored synthesis of molecularly thin platinum nanosheets using designed 2D surfactant solids 査読有り

Eisuke Yamamoto, Akiko Suzuki, Makoto Kobayashi, Minoru Osada

Nanoscale 14 巻頁： 11561 - 11567 2022年6月

無機２次元ナノシートが拓く原子層技術招待有り査読有り

長田　実

まてりあ 60 巻 ( 10 ) 頁： 628 - 633 2021年10月

Construction of multilayer films and superlattice-and mosaic-like heterostructures of 2D metal oxide nanosheets via a facile spin-coating process 査読有り

Hitomi Yano, Nobuyuki Sakai, Yasuo Ebina, Renzhi Ma, Minoru Osada, Kenjiro Fujimoto, Takayoshi Sasaki

ACS Applied Materials & Interfaces 13 巻 ( 36 ) 頁： 43258 - 43265 2021年8月

Solution-Processed Two-Dimensional Metal Oxide Anticorrosion Nanocoating 査読有り

Leanddas Nurdiwijayanto, Hiroki Nishijima, Yoshiharu Miyake, Nobuyuki Sakai, Minoru Osada, Takayoshi Sasaki, and Takaaki Taniguchi

Nano Lett. 21 巻 ( 16 ) 頁： 7044 - 7049 2021年8月

Facile titania nanocoating using single droplet assembly of 2D nanosheets 査読有り

Yue Shi, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

J. Ceram. Soc. Jpn. 129 巻 ( 7 ) 頁： 359 - 364 2021年7月

Reversible hydrogenation and irreversible epoxidation induced by graphene oxide electrolysis

T. Taniguchi, K-C. Wong, L. Nurdiwijayanto, K. Hatakeyama, K. Awaya, S. Ida, K. Koiumuma, S. Ueda, M. Osada, H. Yokoi

Carbon 177 巻頁： 26 - 34 2021年2月

焼かずに機能性セラミックスをつくる

長田実

化学と教育 69 巻 ( 1 ) 頁： 24 - 27 2021年1月

担当区分：筆頭著者,　責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本化学会

<p>機能性セラミックスは，エレクトロニクスから環境・エネルギー，航空・宇宙，医療に至る様々な分野で幅広く活躍している。セラミックスの研究は，古くは粉体，焼結体を扱うバルクから始まり，現在のナノ薄膜の研究へと大きく進展している。特に，近年のナノテクの発展は目覚ましく，原子・分子レベルの構造を自在に操り，新しい機能性セラミックスを開発しようという取り組みが精力的に行われている。本稿では，筆者らのナノ材料の研究を例に，焼かないで機能性セラミックスをつくる新しい技術について紹介したい。</p>

DOI： 10.20665/kakyoshi.69.1_24

CiNii Research

Rational assembly of two-dimensional perovskite nanosheets as building blocks for new ferroelectrics 査読有り国際誌

Muhammad Shuaib Khan, Minoru Osada, Lei Dong, Yoon-Hyun Kim, Yasuo Ebina, Takayoshi Sasaki

ACS Appl. Mater. Interfaces 13 巻 ( 1 ) 頁： 1783 - 1790 2021年1月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Artificial materials in the form of superlattices have been studied actively in quest of new engineering methods or design rules for the development of desired functionalities, in particular high-k ferroelectricity, ferromagnetism, and high mobility electron gas. This work presents a controlled assembly strategy for fabricating atomically precise interfaces of two-dimensional (2D) homologous perovskite nanosheets (Ca2Nam-3Nb
m
O3m+1-; m = 3-6) to construct artificial superlattices. The distinctive thickness of each 2D homologous perovskite nanosheets attributed to the presence of different number of NbO6 octahedra provides an exquisite control to engineer interfacial properties for tailored design of superior high-k properties and emergence of ferroelectricity. The higher dielectric constant (εr = 427) and development of ferroelectricity for (Ca2Nb3O10-/Ca2Na2Nb5O16-)6 superlattice indicate that superlattice films with both odd number of NbO6 octahedra possess extended polarization due to the potential effect of heterointerface and ferroelectric instabilities. Furthermore, the increased discontinuities/offsets in Ca2Nb3O10- and Ca2Na3Nb6O19- nanosheets band alignment results in superior insulating properties (∼1 × 10-11 A cm-2 at 1 V) for (Ca2Nb3O10-/Ca2Na3Nb6O19-)6 superlattice. These findings exhibit new research opportunities for the development of novel artificial high-k dielectric/ferroelectric via precise control of interfaces at the atomic level and can be extended to the large family of 2D perovskite compounds.

DOI： 10.1021/acsami.0c16967

PubMed

焼かずに機能性セラミックスをつくる招待有り査読有り

長田　実

化学と教育 69 巻 ( 1 ) 頁： 24 - 27 2021年1月

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