研究者詳細 - 長田　実

論文 - 長田　実

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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 Open Access

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 Open Access

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

Open Access

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 Open Access

長田　実

化学と教育 69 巻 ( 1 ) 頁： 24 - 27 2021年1月

無機ナノシートを利用した室温セラミックスコーティング招待有り査読有り

長田　実

セラミックス 55 巻 ( 10 ) 頁： 741 - 745 2020年10月

Scalable design of two-dimensional oxide nanosheets for construction of ultrathin multilayer nanocapacitors 査読有り国際誌

Muhammad Shuaib Khan, Hyung-Jun Kim, Yoon-Hyun Kim, Yasuo Ebina, Wataru Sugimoto, Takayoshi Sasaki, Minoru Osada

Small 16 巻頁： 2003485 2020年8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）

Large size of capacitors is the main hurdle in miniaturization of current electronic devices. Herein, a scalable solution-based layer-by-layer engineering of metallic and high-κ dielectric nanosheets into multilayer nanosheet capacitors (MNCs) with overall thickness of ≈20 nm is presented. The MNCs are built through neat tiling of 2D metallic Ru0.95 O20.2- and high-κ dielectric Ca2 NaNb4 O13- nanosheets via the Langmuir-Blodgett (LB) approach at room temperature which is verified by cross-sectional high-resolution transmission electron microscopy (HRTEM). The resultant MNCs demonstrate a high capacitance of 40-52 µF cm-2 and low leakage currents down to 10-5 -10-6 A cm-2 . Such MNCs also possess complimentary in situ robust dielectric properties under high-temperature measurements up to 250 °C. Based on capacitance normalized by the thickness, the developed MNC outperforms state-of-the-art multilayer ceramic capacitors (MLCC, ≈22 µF cm-2 /5 × 104 nm) present in the market. The strategy is effective due to the advantages of facile, economical, and ambient temperature solution assembly.

DOI： 10.1002/smll.202003485

PubMed

Synthesis of NaMoO3F and Na5W3O9F5 with morphological controllability in non-aqueous solvents. 査読有り国際誌

Y. Asakura, T. Akahira, M. Kobayashi, M. Osada, S. Yin

Inorganic Chemistry 59 巻 ( 15 ) 頁： 10707 - 10716 2020年8月

掲載種別：研究論文（学術雑誌）

NaMoO3F and Na5W3O9F5 were synthesized by solvothermal reaction of MoO3 and WO3, respectively, with NaF in nonaqueous solvents. These reactions were realized at low temperatures (150-200 °C) without the use of HF. This synthesis method is much more facile and safe procedure compared with general synthesis methods for oxyfluorides which includes hydrothermal reaction under a presence of HF or solid-state reaction at high temperatures in vacuum sealed tube or under high pressure. In the case of the reaction of MoO3 with NaF, the kind of solvent largely affected the obtained morphologies of NaMoO3F. The morphology in the case of acetonitrile as a solvent was rodlike with a micrometer-scale size, while that in the case of ethanol was polyhedral with a size of several hundred nanometers. In addition, the solvothermal reaction of WO3 with NaF led to the formation of Na5W3O9F5. Also, the difference of solvents for the solvothermal reaction affected the obtained particle sizes. The effect of the solvents on the morphologies of the obtained oxyfluorides probably resulted from the difference of the solubility of NaF and the subsequent dissolution ratio of MoO3 or WO3 in the used solvents. Our synthesis method can expand the applicability of oxyfluorides by providing a new phase and/or unique morphology.

DOI： 10.1021/acs.inorgchem.0c01175

Web of Science

Scopus

PubMed

Graphitic carbon nitride-based low-dimensional heterostructures for photocatalytic applications 査読有り国際誌

M-S. Khan, F. Zhang, M. Osada, S-S. Mao, S. Shen

Solar RRL 4 巻 ( 8 ) 2020年8月

無機ナノシートの精密集積と電子デバイスへの応用招待有り査読有り

長田　実

機能材料 40 巻 ( 7 ) 頁： 15 - 21 2020年7月

On/off boundary of photocatalytic activity between single- and bilayer MoS2 査読有り国際誌

Takaaki Taniguchi, Leanddas Nurdiwijayanto, Shisheng Li, Hong En Lim, Yasumitsu Miyata, Xueyi Lu, Renzhi Ma, Dang-Ming Tang, Shigenori Ueda, Kazuhito Tsukagoshi, Takayoshi Sasaki, Minoru Osada

ACS Nano 14 巻 ( 6 ) 頁： 6663 - 6672 2020年6月

Hard-template synthesis of hollow mesoporous silica nanoplates using layered double hydroxide 査読有り国際誌

Shi Y.

Chemistry Letters 49 巻 ( 9 ) 頁： 1078 - 1080 2020年6月

2次元ナノシートの形態制御と機能材料への応用招待有り査読有り

長田　実

セラミックス 55 巻 ( 5 ) 頁： 390 - 394 2020年5月

van der Waals force layered multiferroic hybrid perovskite (CH3NH3)2CuCl4 single crystals 査読有り国際誌

Zhao Hu, Hongyang Zhao, Zhenxiang Cheng, Jianxu Ding, Han Gao, Yibo Han, Shengao Wang, Zhiwen Xu, Yucheng Zhou, Tingting Jia, Hideo Kimura, Minoru Osada

Physical chemistry chemical physics : PCCP 22 巻 ( 7 ) 頁： 4235 - 4239 2020年4月

担当区分：最終著者掲載種別：研究論文（学術雑誌）

In inorganic-organic perovskites, the three-dimensional arrangement of the organic group results in more subtle balance of charge, spin and space, thereby providing an attractive route toward new multiferroics. Here we report the existing of multiple ferroic orderings in inorganic-organic layered perovskites with relative strong hydrogen bond ordering of the organic chains intra plane. In addition, the inter plane in perovskite is stacking via van der Waals force. However, such magnetoelectric coupling properties for this compound have not been reported since it is difficult to characterize the properties in single crystals since most of the hybrid perovskites are usually deliquescent and unstable when exposed to air. To deal with these problems, we synthesized a (CH3NH3)2CuCl4 single crystal by using a simple evaporation technique, and demonstrated ferroelectric, magnetic and magneto-electric properties of (CH3NH3)2CuCl4. The internal hydrogen bonding of easily tunable organic unit combined with 3d transition-metal layers in such hybrid perovskites make (CH3NH3)2CuCl4 a multiferroic crystal with magnetoelectrical coupling and offer an new way to engineer multifunctional multiferroic.

DOI： 10.1039/c9cp05976h

Web of Science

PubMed

Guanine crystals regulated by chitin-based honeycomb frameworks for tunable structural colors of sapphirinid copepod, Sapphirina nigromaculata 査読有り国際誌 Open Access

Kimura Tsubasa, Takasaki Mihiro, Hatai Ryosuke, Nagai Yukiko, Uematsu Katsuyuki, Oaki Yuya, Osada Minoru, Tsuda Hiroyuki, Ishigure Takaaki, Toyofuku Takashi, Shimode Shinji, Imai Hiroaki

10 巻 ( 1 ) 頁： 2266 - 2266 2020年2月

Nitrogen doped ultrathin calcium/sodium niobate perovskite nanosheets for photocatalytic water oxidation 査読有り国際誌

Khan Muhammad Shuaib, Diao Zhidan, Osada Minoru, Shen Shaohua

SOLAR ENERGY MATERIALS AND SOLAR CELLS 205 巻 2020年2月

UV degradation mechanism of TiO2-based perovskite solar cells studied by pump-probe spectroscopy 査読有り国際誌

Luo Chih-Wei, Thilakan Anusha Puliparambil, Li Jia-Xin, Chen Tzu-Pei, Li Shao-Sian, Chen Chun-Wei, Yabushita Atsushi, Osada Minoru, Tsukagoshi Kazuhito, Sasaki Takayoshi

PHOTONICS FOR SOLAR ENERGY SYSTEMS VIII 11366 巻 2020年

無機ナノシートを利用した室温セラミックスコーティング

長田実

セラミックス 55 巻頁： 741 - 745 2020年

Tunable Chemical Coupling in Two-Dimensional van der Waals Electrostatic Heterostructures.

Taniguchi T, Li S, Nurdiwijayanto L, Kobayashi Y, Saito T, Miyata Y, Obata S, Saiki K, Yokoi H, Watanabe K, Taniguchi T, Tsukagoshi K, Ebina Y, Sasaki T, Osada M

ACS nano 2019年10月

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