Faculty Profiles - OSADA Minoru

Papers - OSADA Minoru

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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 Invited Reviewed

長田　実

セラミックス Vol. 55 ( 10 ) page： 741 - 745 2020.10

Scalable design of two-dimensional oxide nanosheets for construction of ultrathin multilayer nanocapacitors Reviewed International journal

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

Small Vol. 16 page： 2003485 2020.8

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

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. Reviewed International journal

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

Inorganic Chemistry Vol. 59 ( 15 ) page： 10707 - 10716 2020.8

Publishing type：Research paper (scientific journal)

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 Reviewed International journal

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

Solar RRL Vol. 4 ( 8 ) 2020.8

無機ナノシートの精密集積と電子デバイスへの応用 Invited Reviewed

長田　実

機能材料 Vol. 40 ( 7 ) page： 15 - 21 2020.7

On/off boundary of photocatalytic activity between single- and bilayer MoS2 Reviewed International journal

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 Vol. 14 ( 6 ) page： 6663 - 6672 2020.6

Hard-template synthesis of hollow mesoporous silica nanoplates using layered double hydroxide Reviewed International journal

Shi Y.

Chemistry Letters Vol. 49 ( 9 ) page： 1078 - 1080 2020.6

2次元ナノシートの形態制御と機能材料への応用 Invited Reviewed

長田　実

セラミックス Vol. 55 ( 5 ) page： 390 - 394 2020.5

van der Waals force layered multiferroic hybrid perovskite (CH3NH3)2CuCl4 single crystals Reviewed International journal

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 Vol. 22 ( 7 ) page： 4235 - 4239 2020.4

Authorship：Last author Publishing type：Research paper (scientific journal)

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. Reviewed International journal

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

Scientific Reports Vol. 10 ( 1 ) page： 2266 - 2266 2020.2

Publishing type：Research paper (scientific journal)

Sapphirinid copepods, which are marine zooplankton, exhibit tunable structural colors originating from a layered structure of guanine crystal plates. In the present study, the coloring portion of adult male of a sapphirinid copepod, Sapphirina nigromaculata, under the dorsal body surface was characterized to clarify the regulation and actuation mechanism of the layered guanine crystals for spectral control. The coloring portions are separated into small domains 70-100 µm wide consisting of an ordered array of stacked hexagonal plates ~1.5 µm wide and ~80 nm thick. We found the presence of chitin-based honeycomb frameworks that are composed of flat compartments regulating the guanine crystal plates. The structural color is deduced to be tuned from blue to achromatic via yellow and purple by changing the interplate distance according to vital observation and optical simulation using a photonic array model. The framework structures are essential for the organization and actuation of the particular photonic arrays for the exhibition of the tunable structural color.

DOI： 10.1038/s41598-020-59090-4

Web of Science

Scopus

PubMed

Nitrogen doped ultrathin calcium/sodium niobate perovskite nanosheets for photocatalytic water oxidation Reviewed International journal

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

SOLAR ENERGY MATERIALS AND SOLAR CELLS Vol. 205 2020.2

UV degradation mechanism of TiO2-based perovskite solar cells studied by pump-probe spectroscopy Reviewed International journal

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 Vol. 11366 2020

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 Vol. 55 page： 741 - 745 2020

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 2019.10

Wafer-scale and deterministic patterned growth of monolayer MoS(2)via vapor-liquid-solid method

Li Shisheng, Lin Yung-Chang, Liu Xu-Ying, Hu Zehua, Wu Jing, Nakajima Hideaki, Liu Song, Okazaki Toshiya, Chen Wei, Minari Takeo, Sakuma Yoshiki, Tsukagoshi Kazuhito, Suenaga Kazu, Taniguchi Takaaki, Osada Minoru

NANOSCALE Vol. 11 ( 34 ) page： 16122-16129 2019.9

Dielectric nanosheet modified plasmonic-paper as highly sensitive and stable SERS substrate and its application for pesticides detection.

Mekonnen ML, Chen CH, Osada M, Su WN, Hwang BJ

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 225 page： 117484 2019.8

Controlled Assembly of Inorganic Nanosheets and Its Application to High-Performance Metamaterials

OSADA Minoru, TANIGUCHI Takaaki, SASAKI Takayoshi

Journal of The Surface Finishing Society of Japan Vol. 70 ( 7 ) page： 355 - 358 2019.7

Origin of Extended UV Stability of 2D Atomic Layer Titania-Based Perovskite Solar Cells Unveiled by Ultrafast Spectroscopy

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

ACS APPLIED MATERIALS & INTERFACES Vol. 11 ( 24 ) page： 21473-21480 2019.6

Enhanced oxide-ion conductivity of solid-state electrolyte mesocrystals

Tsukiyama Keishi, Takasaki Mihiro, Kitamura Naoto, Idemoto Yasushi, Oaki Yuya, Osada Minoru, Imai Hiroaki

NANOSCALE Vol. 11 ( 10 ) page： 4523-4530 2019.3

酸化物ナノシートの液相合成と機能材料への応用

長田実

ファインケミカル Vol. 48 page： 28 - 33 2019

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Papers - OSADA Minoru