論文 - 山本　瑛祐

Surfactant Templating for the Subnanometer Thickness Engineering of Free-Standing Nonlayered Nanosheets 査読有り 国際共著

Eisuke Yamamoto, Yuma Takezaki, Renjiro Hara, Makoto Kobayashi, Ruben Canton Vitoria, Zixiao Shi, David A. Muller, Thomas E. Mallouk, Minoru Osada

ACS Nano     2025年11月

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担当区分：筆頭著者,　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：American Chemical Society (ACS)  

DOI： 10.1021/acsnano.5c13829

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Molecularly Thin Nanosheet Films as Water Dissociation Reaction Catalysts Enhanced by Strong Electric Fields in Bipolar Membranes 査読有り

Eisuke Yamamoto, Tianyue Gao, Langqiu Xiao, Kelly Kopera, Sariah Marth, Heemin Park, Chulsung Bae, Minoru Osada, Thomas E. Mallouk

Journal of the American Chemical Society     2025年4月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/jacs.4c17830

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Bipolar Membranes With Controlled, Microscale 3D Junctions Enhance the Rates of Water Dissociation and Formation 査読有り

Tianyue Gao, Leanna Schulte, Langqiu Xiao, Eisuke Yamamoto, Amy S. Metlay, Colton J. Sheehan, Sariah Marth, Heemin Park, Sayantan Sasmal, Francisco J. Galang, Chulsung Bae, Adam Z. Weber, Shannon W. Boettcher, Thomas E. Mallouk

Advanced Energy Materials     2024年11月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/aenm.202404285

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Solid-state surfactant templating for controlled synthesis of amorphous 2D oxide/oxyhydroxide nanosheets 査読有り Open Access

Eisuke Yamamoto, Daiki Kurimoto, Kentaro Ito, Kohei Hayashi, Makoto Kobayashi, Minoru Osada

Nature Communications   15 巻   頁： 6612   2024年8月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41467-024-51040-2

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界面活性剤を用いた非層状系ナノシート合成の新展開

山本 瑛祐, 長田 実

Ceramics Japan = セラミックス : bulletin of the Ceramic Society of Japan   58 巻 ( 7 ) 頁： 441 - 444   2023年7月

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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：東京 : 日本セラミックス協会  

CiNii Research

Free-Standing Molecularly Thin Amorphous Silica Nanosheets 査読有り Open Access

Eisuke Yamamoto, Kosuke Fujihara, Yuma Takezaki, Kentaro Ito, Yue Shi, Makoto Kobayashi, Minoru Osada

Small     頁： 2300022   2023年2月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1002/smll.202300022

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

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： DOI https://doi.org/10.1039/D2NR01807A

Formation of Closed Pores in Mesoporous Silica Nanoparticles by Hydrothermal Treatment 査読有り

E. Yamamoto, C. Lulu, T. Watanabe, S. Mori, H. Wada, A. Shimojima, K. Kuroda

Bulletin of the Chemical Society of Japan   just accepted 巻 ( just accepted ) 頁： just accepted - just accepted   2021年4月

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1246/bcsj.20210025

Preparation of Colloidal Monodisperse Hollow Organosiloxane-based Nanoparticles with Double Mesoporous Shell 査読有り

T. Watanabe, E. Yamamoto, H. Wada, A. Shimojima, K. Kuroda

Bulletin of the Chemical Society of Japan   just accepted 巻 ( just accepted ) 頁： just accepted - just accepted   2021年4月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Preparation of Sub-50 nm Colloidal Monodispersed Hollow Siloxane-Based Nanoparticles with Controlled Shell Structures 査読有り

Tenkai Watanabe, Eisuke Yamamoto, Saki Uchida, Lulu Cheng, Hiroaki Wada, Atsushi Shimojima, and Kazuyuki Kuroda

Langmuir   36 巻 ( 46 ) 頁： 13833 - 13842   2020年11月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.langmuir.0c02190

Mesoporous Silica Nanoparticles with Dispersibility in Organic Solvents and Their Versatile Surface Modification 査読有り

E.Yamamoto, A. Shimojima, H. Wada, K. Kuroda

Langmuir   36 巻   頁： 5571 - 5578   2020年4月

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1021/acs.langmuir.0c00729

Transformation of Mesostructured Silica Nanoparticles into Colloidal Hollow Nanoparticles in the Presence of a Bridged-Organosiloxane Shell 査読有り

Eisuke Yamamoto, Saki Uchida, Atsushi Shimojima, Hiroaki Wada, and Kazuyuki Kuroda

Chemistry of Materials   30 巻 ( 2 ) 頁： 540-548   2018年1月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.chemmater.7b04860

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Fabrication of Colloidal Crystals Composed of Pore-expanded Mesoporous Silica Nanoparticles Prepared by a Controlled Growth Method 査読有り Open Access

Eisuke Yamamoto, Seiya Mori, Atsushi Shimojima, Hiroaki Wada, and Kazuyuki Kuroda

Nanoscale   9 巻 ( 7 ) 頁： 2464-2470   2017年2月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/c6nr07416b

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Colloidal Mesoporous Silica Nanoparticles 招待有り 査読有り Open Access

Eisuke Yamamoto, and Kazuyuki Kuroda

Bulletin of the Chemical Society of Japan   89 巻 ( 5 ) 頁： 501-539   2016年5月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1246/bcsj.20150420

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Tailored Nitrogen Doping of Titania Nanosheets Revealed by a Combined Photoelectron Spectroscopy 査読有り Open Access

Makoto Kobayashi, Naoki Hagishima, Eisuke Yamamoto, Minoru Osada

Advanced Materials Interfaces     2025年11月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/admi.202500570

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Covalent Functionalization of MXenes with Porphyrin for Visible‐Light Activation in Energy Conversion Nanodevices 査読有り

Hong Li, Ruben Canton‐Vitoria, Yuto Urano, Sudhanshu Kumar Nayak, Eisuke Yamamoto, Makoto Kobayashi, Ryo Kitaura, Minoru Osada

Small     2025年8月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Wiley  

Abstract

MXenes such as Ti₃C₂ and Ti₃CN are 2D materials characterized by the presence of a T_x phase that passivates the reactive titanium surface. Modifying their chemical composition to anchor target molecules is of great interest for addressing key challenges, such as enhancing the conversion of visible light into electricity. In this study, a covalent functionalization strategy is developed to modify the T_x phase of Ti₃C₂ or Ti₃CN with alkyl amines, followed by coupling with Zn‐porphyrin. This process activates the optical properties of MXenes without causing any damage. X‐ray photoelectron spectroscopy and infrared spectroscopy are pivotal in confirming the covalent functionalization, while thermogravimetric analysis, transmission electron microscopy, and additional techniques provided further insights into structural and chemical features. Spectroelectrochemical investigations reveal carrier injection into MXenes under light illumination, potentially enhancing conductivity. Photodetectors fabricated from these films demonstrate responsivities of 1.4–15.0 A W⁻¹ and external quantum efficiencies ranging from 1300 to 2830% in the visible range, making them comparable to well‐established hybrid 2D nanomaterials like MoS₂ and WS₂.

DOI： 10.1002/smll.202503895

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Mechanical exfoliation of non-van der Waals solids: a study of layered perovskite ferroelectric CsPb2Nb3O10 査読有り

Masanari Shimada, Yan Li, Makoto Kobayashi, Eisuke Yamamoto, Ruben Canton-Vitoria, Minoru Osada

Chemistry Letters   54 巻 ( 2 )   2025年1月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Oxford University Press (OUP)  

Abstract

Mechanical exfoliation of layered materials is one of the most effective methods for obtaining 2D nanosheets. However, this approach is still limited to van der Waals (vdW) layered materials, where interlayer interactions are governed by weak vdW forces. In this study, we used a layered perovskite ferroelectric (CsPb2Nb3O10) as a model system to explore the mechanical exfoliation behavior of ionically bonded non-vdW layered materials. Due to the relatively weak out-of-plane bonds involving the interlayer Cs⁺ ions, CsPb2Nb3O10 could be cleaved into ultrathin sheets with thicknesses ranging from 7.5 to 50 nm. Using piezoresponse force microscopy, we investigated the thickness-dependent ferroelectric properties of CsPb2Nb3O10 nanosheets.

DOI： 10.1093/chemle/upaf006

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その他リンク： https://academic.oup.com/chemlett/article-pdf/54/2/upaf006/61648459/upaf006.pdf

Atomic Layer Engineering of Ferroelectricity in Dion–Jacobson Perovskites 査読有り

Shu Morita, Daisuke Urushihara, Keita Nishibashi, Makoto Kobayashi, Eisuke Yamamoto, Toru Asaka, Hiroshi Nakajima, Shigeo Mori, Minoru Osada

Journal of the American Chemical Society     2024年8月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Chemical Society (ACS)  

DOI： 10.1021/jacs.4c09214

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Atomic Layer Engineering of Pd Nanosheets for an Enhanced Hydrogen Evolution Reaction 査読有り

Sumiya Ando, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

Nano Letters     2024年8月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Chemical Society (ACS)  

DOI： 10.1021/acs.nanolett.4c02741

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Ultrafast 2D Nanosheet Assembly via Spontaneous Spreading Phenomenon 査読有り

Yue Shi, Hong Li, Hirofumi Tsunematsu, Harumi Ozeki, Kimiko Kano, Eisuke Yamamoto, Makoto Kobayashi, Hiroya Abe, Chun‐Wei Chen, Minoru Osada

Small     2024年7月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Wiley  

Abstract

In 2D materials, a key engineering challenge is the mass production of large‐area thin films without sacrificing their uniform 2D nature and unique properties. Here, it is demonstrated that a simple fluid phenomenon of water/alcohol solvents can become a sophisticated tool for self‐assembly and designing organized structures of 2D nanosheets on a water surface. In situ, surface characterizations show that water/alcohol droplets of 2D nanosheets with cationic surfactants exhibit spontaneous spreading of large uniform monolayers within 10 s. Facile transfer of the monolayers onto solid or flexible substrates results in high‐quality mono‐ and multilayer films with high coverages (>95%) and homogeneous electronic/optical properties. This spontaneous spreading is quite general and can be applied to various 2D nanosheets, including metal oxides, graphene oxide, h‐BN, MoS₂, and transition metal carbides, enabling on‐demand smart manufacture of large‐size (>4 inchϕ) 2D nanofilms and free‐standing membranes.

DOI： 10.1002/smll.202403915

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その他リンク： https://onlinelibrary.wiley.com/doi/pdf/10.1002/smll.202403915

Hetero-assembly design of 2D oxide nanosheets for tailored thermal shielding materials 査読有り

Tsunematsu, H; Nishibashi, K; Yamamoto, E; Kobayashi, M; Yoshida, T; Osada, M

APPLIED PHYSICS EXPRESS   17 巻 ( 1 )   2024年1月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Applied Physics Express  

We present a new approach for designing thermal shielding materials using two-dimensional oxide nanosheets. Our approach uses hetero-assembly design [(Ti0.87O2)m (Cs2.7W11O35−d )20 (m = 0, 5, 10)] by overlaying high refractive index (n) Ti0.87O2 nanosheets with transparent conducting Cs2.7W11O35−d nanosheets. Through proper design of the thickness of high-n Ti0.87O2 layers, we achieved the optimum thermal shielding properties with a high NIR reflectance (>46%), a high visible transparency (>76%) and a neutral color in an ultrathin form (<60 nm). Our nanosheet approach is of technological importance for exploring new thermal shielding materials.

DOI： 10.35848/1882-0786/ad13ce

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Ferroelectricity in CsPb2Nb3O10 and exfoliated 2D nanosheets 査読有り

Yan Li, Masanari Shimada, Makoto Kobayashi, Eisuke Yamamoto, Ruben Canton-Vitoria, Xiaoyan Liu, Minoru Osada

Dalton Transactions     2024年

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/D4DT02343A

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Facile Synthesis of Pd Nanosheets and Implications for Superior Catalytic Activity 査読有り

Ando, S; Yamamoto, E; Kobayashi, M; Kumatani, A; Osada, M

ACS NANO   18 巻 ( 1 ) 頁： 461 - 469   2023年11月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Nano  

As a member of the 2D materials family, 2D metal nanosheets (metallenes) have received increasing attention due to their intriguing properties distinct from those of graphene and other inorganic 2D nanosheets. However, the synthesis of metallenes is still challenging, owing to the lack of an efficient synthetic approach. Here we present a facile one-pot approach to the controlled synthesis of Pd nanosheets. A key feature of this process is a stepwise reaction using 2,4,6-trichlorophenyl formate (TCPF); TCPF emits carbon monoxide gas, which acts as both a reductant and a surface capping agent, promoting the anisotropic 2D growth of the Pd nanosheets. Photoemission spectroscopy revealed some peculiar features of the surface charge and valence band states due to suppressed electron transfer at the 2D surface. This surface state caused improved catalytic activity for the hydrogen evolution reaction compared to that of bulk Pd.

DOI： 10.1021/acsnano.3c07861

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2D Bismuth Oxyfluorides: A New Member of Cationic Nanosheets 査読有り Open Access

Kobayash, M; Tasaka, T; Yamamoto, E; Osada, M

CHEMISTRY LETTERS   52 巻 ( 6 ) 頁： 449 - 451   2023年6月

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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  

Two kinds of single-crystalline oxyfluoride nanosheets were synthesized by exfoliation of layered bismuth oxyfluorides intercalated with nitrates. The solution-based exfoliation process produced multilayered cationic oxyfluoride nanosheets with thicknesses of several nanometers. A second harmonic generation measurement clarified that one of the nanosheets had a noncentrosymmetric structure. This is the first example of a cationic nanosheet with nonlinear optical properties.

DOI： 10.1246/cl.230136

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Ultrahigh Energy Storage in 2D High-κ Perovskites 査読有り

Kim, HJ; Morita, S; Byun, KN; Shi, Y; Taniguchi, T; Yamamoto, E; Kobayashi, M; Ebina, Y; Sasaki, T; Osada, M

NANO LETTERS   23 巻 ( 9 ) 頁： 3788 - 3795   2023年5月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Nano Letters  

Dielectric capacitors have greater power densities than batteries, and, unlike batteries, they do not utilize chemical reactions during cycling. Thus, they can become ideal, safe energy storage devices. However, dielectric capacitors yield rather low energy densities compared with other energy storage devices such as batteries and supercapacitors. Here, we present a rational approach for designing ultrahigh energy storage capacitors using two-dimensional (2D) high-κ dielectric perovskites (Ca2Nam-3NbmO3m+1; m = 3-6). Individual Ca2Nam-3NbmO3m+1 nanosheets exhibit an ultrahigh dielectric strength (638-1195 MV m-1) even in the monolayer form, which exceeds those of conventional dielectric materials. Multilayer stacked nanosheet capacitors exhibit ultrahigh energy densities (174-272 J cm-3), high efficiencies (>90%), excellent reliability (>107 cycles), and temperature stability (−50-300 °C); the maximum energy density is much higher than those of conventional dielectric materials and even comparable to those of lithium-ion batteries. Enhancing the energy density may make dielectric capacitors more competitive with batteries.

DOI： 10.1021/acs.nanolett.3c00079

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Gigantic Thermal Shielding in 2D Oxide Nanosheets 査読有り 国際誌

Tsunematsu, H; Shi, Y; Yamamoto, E; Kobayashi, M; Yoshida, T; Osada, M

ACS NANO   17 巻 ( 12 ) 頁： 11396 - 11405   2023年5月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Nano  

Thermal shielding materials that can block near-infrared (NIR) light from the sunlight while maintaining visible transparency have become increasingly important from an energy-saving perspective. Here, we demonstrate a gigantic NIR shielding by an engineered plasmonic material based on a two-dimensional (2D) polytungstate (Cs4-xW11O35-d). Starting from a charge-neutral polytungstate (Cs4W11O35), we synthesize charge-imbalanced 2D nanosheets (Cs4-xW11O35-d) that undergo an unusual structural change with the semiconductor-to-metal transition in a reduced atmosphere. Layer-by-layer engineering of the 2D nanosheets enables a plasmon-induced enhancement of the NIR reflectance (>53%) with a high visible transparency (>71%), realizing high-performance thermal shielding. Our approach offers a solution for future thermal management technology.

DOI： 10.1021/acsnano.3c00815

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

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

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

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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

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

Byun, KN; Shi, Y; Yamamoto, E; Kobayashi, M; Osada, M

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   131 巻 ( 4 ) 頁： 77 - 82   2023年4月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of the Ceramic Society of Japan  

We present a new approach for designing flexible energy storage capacitors using two-dimensional (2D) inorganic nanosheets. 2D dielectric Ca2Nb3O10 nanosheet and ferroelectric poly(vinylidene fluoride) (PVDF) were selected as model material systems. LangmuirBlodgett deposition was utilized for layer-by-layer engineering of (Ca2Nb3O10/PVDF) nanocomposite films on an indium tin oxide (ITO)-coated polyethylene terephthalate (PET) substrate. Such a new composite design realized the simultaneous improvement of energy density (37 J cm13) and efficiency (378 %) even in the ultrathin form (320 nm) on the ITO-coated PET substrate. Nanosheet-based flexible capacitors also maintained a stable performance even after 104 times bending cycles. These results indicate that our nanosheet approach is of technological importance for exploring new flexible dielectric capacitors.

DOI： 10.2109/jcersj2.22150

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Molecularly Thin BaTiO₃ Nanosheets with Stable Ferroelectric Response 査読有り Open Access

Hagiwara, K; Byun, KN; Morita, S; Yamamoto, E; Kobayashi, M; Liu, XY; Osada, M

ADVANCED ELECTRONIC MATERIALS   9 巻 ( 4 ) 頁： 2201239 - 2201239   2023年4月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Advanced Electronic Materials  

2D ferroelectrics provide great promise for future electronics owing to their unique properties at 2D limit. Although simple perovskite oxides (such as BaTiO3 and PbTiO3) are an important target for 2D ferroelectrics, controlled synthesis of 2D nanosheets still remains a challenge. Here, this issue is addressed by using a new chemical protocol; unilamellar Ti0.87O2 nanosheets can serve as templates, guiding the solvothermal synthesis of 2D BaTiO3 nanosheets with a molecularly thin thickness (< 3 nm). Raman spectroscopy, second-harmonic generation, and transmission electron microscopy characterizations suggest the formation of tetragonal ferroelectric BaTiO3 nanosheets. Based on piezoresponse force microscopy, BaTiO3 nanosheets exhibit a clear ferroelectric response with a high Curie temperature (≈100 °C) even down to 1.8 nm thickness. This study provides new opportunities to investigate perovskite ferroelectrics with the critical thickness.

DOI： 10.1002/aelm.202201239

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その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/aelm.202201239

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

Shi, Y; Yamamoto, E; Kobayashi, M; Osada, M

ACS APPLIED MATERIALS & INTERFACES   15 巻 ( 18 ) 頁： 22737 - 22743   2023年3月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Applied Materials and Interfaces  

The effective application of 2D materials is strongly dependent on the mass production of high-quality large-area 2D thin films. Here, we demonstrate a strategy for the automated manufacturing of high-quality 2D thin films using a modified drop-casting approach. Our approach is simple; by using an automated pipette, a dilute aqueous suspension is dropped onto a substrate heated on a hotplate, and controlled convection by Marangoni flow and liquid removal causes the nanosheets to come together to form a tile-like monolayer film in 1-2 min. Ti0.87O2 nanosheets are utilized as a model system for investigating the control parameters such as concentrations, suction speeds, and substrate temperatures. We perform the automated one-drop assembly of a range of 2D nanosheets (metal oxides, graphene oxide, and hexagonal boron nitride) and successfully fabricate various functional thin films in multilayered, heterostructured, and sub-micrometer-thick forms. Our deposition method enables on-demand large-size (>2 inchϕ) manufacturing of high-quality 2D thin films while reducing the time and sample consumption.

DOI： 10.1021/acsami.3c02250

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Free-Standing Molecularly Thin Amorphous Silica Nanosheets 査読有り Open Access

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

SMALL   19 巻 ( 22 ) 頁： 2300022 - 2300022   2023年2月

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担当区分：筆頭著者,　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

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

Molecularly Thin BaTiO3 Nanosheets with Stable Ferroelectric Response 査読有り Open Access

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

Advanced Electronic Materials     2023年2月

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記述言語：英語  

DOI： 10.1002/aelm.202201239

Open Access

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

Shi, Y; Taniguchi, T; Byun, KN; Kurimoto, D; Yamamoto, E; Kobayashi, M; Tsukagoshi, K; Osada, M

SCIENTIFIC REPORTS   13 巻 ( 1 ) 頁： 2583   2023年2月

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Scientific Reports  

Desired electrode patterning on two-dimensional (2D) materials is a foremost step for realizing the full potentials of 2D materials in electronic devices. Here, we introduce an approach for damage-free, on-demand manufacturing of 2D material devices using light-emitting diode (LED) lithography. The advantage of this method lies in mild photolithography by simply combining an ordinary optical microscope with a commercially available LED projector; the low-energy red component is utilized for optical characterization and alignment of devices, whereas the high-energy blue component is utilized for photoresist exposure and development of personal computer designed electrode patterns. This method offers maskless, damage-free photolithography, which is particularly suitable for 2D materials that are sensitive to conventional lithography. We applied this LED lithography to device fabrication of selected nanosheets (MoS2, graphene oxides and RuO2), and achieved damage-free lithography of various patterned electrodes with feature sizes as small as 1–2 μm. The LED lithography offers a useful approach for cost-effective mild lithography without any costly instruments, high vacuum, or complex operation.

DOI： 10.1038/s41598-023-29281-w

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その他リンク： https://www.nature.com/articles/s41598-023-29281-w

Improved Energy Storage Performance of PVDF Nanocapacitors by Utilizing 2D Inorganic Barrier Layers 査読有り

Byun, KN; Yamamoto, E; Kobayash, M; Osada, M

CHEMISTRY LETTERS   52 巻 ( 1 ) 頁： 51 - 54   2023年1月

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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 a rational approach for designing highperformance polymer-based energy storage capacitors. Twodimensional paraelectric Ca2Nb3O10 nanosheets were deposited on a ferroelectric poly(vinylidene fluoride) (PVDF) film to form paraelectric/ferroelectric hetero-assemblies. Such an artificial structuring enabled tailoring of the breakdown strength and dielectric response, realizing an enhanced energy density (∼10 J cm-3) compared to pristine PVDF film (∼1 J cm-3).

DOI： 10.1246/cl.220466

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

Y.Shi, J. Wang, E. Yamamoto, M. Osada

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

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1246/cl.200387

Pore Clogging of Colloidal Mesoporous Silica Nanoparticles for Encapsulating Guest Species 査読有り

Eisuke Yamamoto, Kouya Nagata, Kenta Onishi, Chihiro Urata, Atsushi Shimojima, Hiroaki Wada, Shinji Takeoka and Kazuyuki Kuroda

Bulletin of the Chemical Society of Japan   90 巻 ( 6 ) 頁： 706-708   2017年6月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1246/bcsj.20170053

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メソポーラスシリカナノ粒子の精密合成 Open Access

山本 瑛祐, 下嶋 敦, 黒田 一幸

日本結晶成長学会誌   44 巻 ( 2 ) 頁： 82-87   2017年

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記述言語：日本語  

<p>  Mesoporous silica nanoparticles have attracted great attention because of their potential applications as catalysts, drug/gene delivery carriers, and optical materials because of high surface area, large pore volume, transparency, biocompatibility, and high cell uptake efficiency. This review reports general preparation and applications of mesoporous silica nanoparticles, and our recent efforts on the preparation of well-dispersed mesoporous silica nanoparticles with precisely controlled particle size, pore size, functionality, and morphology.</p>

DOI： 10.19009/jjacg.44.2_82

Open Access

CiNii Research

Effective Use of Alkoxysilanes with Different Hydrolysis Rates for Particle Size Control of Aqueous Colloidal Mesostructured and Mesoporous Silica Nanoparticles by the Seed-Growth Method 査読有り

Hironori Yamada, Chihiro Urata, Eisuke Yamamoto, Sayuri Higashitamori, Yusuke Yamauchi, and Kazuyuki Kuroda

ChemNanoMat   1 巻 ( 3 ) 頁： 194-202   2015年7月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/cnma.201500010

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A multifunctional role of trialkylbenzenes for the preparation of aqueous colloidal mesostructured/mesoporous silica nanoparticles with controlled pore size, particle diameter, and morphology 査読有り Open Access

Yamada Hironori, Ujiie Hiroto, Urata Chihiro, Yamamoto Eisuke, Yamauchi Yusuke, Kuroda Kazuyuki

NANOSCALE   7 巻 ( 46 ) 頁： 19557-19567   2015年

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/c5nr04465k

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Preparation of Size-Controlled Monodisperse Colloidal Mesoporous Silica Nanoparticles and Fabrication of Colloidal Crystals 査読有り

Eisuke Yamamoto, Masaki Kitahara, Takuya Tsumura, and Kazuyuki Kuroda

Chemistry of Materials   26 巻 ( 9 ) 頁： 2927-2933   2014年5月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/cm500619p

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