Faculty Profiles - KOBAYASHI Makoto

Papers - KOBAYASHI Makoto

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Enhanced overall water splitting under visible light irradiation over Ir and La-codoped NaTaO₃ by post KCl flux treatment Reviewed

Taichi Sato, Makoto Kobayashi, Akihide Iwase

Journal of Materials Chemistry A Vol. 14 ( 6 ) page： 3584 - 3590 2025.12

Surfactant Templating for the Subnanometer Thickness Engineering of Free-Standing Nonlayered Nanosheets Reviewed International coauthorship

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

ACS Nano Vol. 19 ( 46 ) page： 39936 - 39945 2025.11

Tailored Nitrogen Doping of Titania Nanosheets Revealed by a Combined Photoelectron Spectroscopy Reviewed Open Access

Makoto Kobayashi, Naoki Hagishima, Eisuke Yamamoto, Minoru Osada

Advanced Materials Interfaces 2025.9

Covalent Functionalization of MXenes with Porphyrin for Visible‐Light Activation in Energy Conversion Nanodevices Reviewed International coauthorship Open Access

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

Small Vol. 21 ( 38 ) page： e03895 2025.9

Development of Z-Scheme Photocatalyst Systems Combining Nonmetal Oxide Materials for Water Splitting under Visible Light Irradiation: (CuGa)_0.5ZnS₂ as a H₂-Evolving Photocatalyst and TaON as an O₂-Evolving Photocatalyst Reviewed International coauthorship Open Access

Misa Moriya, Shunya Yoshino, Makoto Kobayashi, Hideki Kato, Yun Hau Ng, Akihide Iwase

Advanced Energy and Sustainability Research Vol. 6 ( 7 ) page： 2400371 2025.7

Mechanical exfoliation of non-var der Waals solids: A study of layered perovskite ferroelectric CsPb₂Nb₃O₁₀ Reviewed Open Access

Masanari Shimada, Yan Li, Makoto Kobayashi, Eisuke Yamamoto, Rubén Cantón Vitoria, Minoru Osada

Chemistry Letters Vol. 64 ( 2 ) page： upaf006 2025.1

Atomic Layer Engineering of Ferroelectricity in Dion–Jacobson Perovskites Reviewed

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

Journal of the American Chemical Society Vol. 146 ( 36 ) page： 25221 - 25231 2024.8

Atomic Layer Engineering of Pd Nanosheets for an Enhanced Hydrogen Evolution Reaction Reviewed

Sumiya Ando, Eisuke Yamamoto, Makoto Kobayashi, Minoru Osada

Nano Letters Vol. 24 ( 36 ) page： 11239 - 11245 2024.8

Solid-state surfactant templating for controlled synthesis of amorphous 2D oxide/oxyhydroxide nanosheets Reviewed

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

Nature Communications Vol. 15 ( 1 ) page： 6612 2024.8

Ultrafast 2D Nanosheet Assembly via Spontaneous Spreading Phenomenon Reviewed International coauthorship

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

Small Vol. 20 ( 36 ) page： e2403915 2024.7

Language：English Publishing type：Research paper (scientific journal) Publisher：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

Other Link： https://onlinelibrary.wiley.com/doi/pdf/10.1002/smll.202403915

Multiemission of Ce³⁺ from Single Crystallographic Site Induced by Disordering of Ions Reviewed

Takuya Yasunaga, Makoto Kobayashi, Kenji Oqmhula, Huan Qi, Tom Ichibha, Kenta Hongo, Shunsuke Yamamoto, Ryo Maezono, Masaya Mitsuishi, Minoru Osada, Hideki Kato, Masato Kakihana

Inorganic Chemistry Vol. 63 ( 2 ) page： 1288 - 1295 2024.1

Hetero-assembly design of 2D oxide nanosheets for tailored thermal shielding materials Reviewed Open Access

Hirofumi Tsunematsu, Keita Nishibashi, Eisuke Yamamoto, Makoto Kobayashi, Tomohiro Yoshida, Minoru Osada

Applied Physics Express Vol. 17 ( 1 ) page： 015002 2024.1

Z-scheme water splitting utilizing CuLi1/3Ti2/3O2 as a hydrogen-evolving photocatalyst with photo-response up to 600 nm Reviewed

Shunya Yoshino, Tanya Kurutach, Qingshan Liu, Toshiki Yamanaka, Shunsuke Nozawa, Makoto Kobayashi, Hiromu Kumagai, Hideki Kato

Sustainable Energy & Fuels Vol. 8 ( 6 ) page： 1260 - 1268 2024

Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

CuLi1/3Ti2/3O2 modified with Cr2O3/Ru, which can utilize longer wavelength light in comparison with SrTiO3:Rh, a representative H2-evolving component, was successfully applied to Z-scheme water splitting with BiVO4 and Co(bpy)33+/2+.

DOI： 10.1039/d3se01622f

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Ferroelectricity in CsPb2Nb3O10 and exfoliated 2D nanosheets Reviewed International coauthorship

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

Dalton Transactions Vol. 53 ( 45 ) page： 18122 - 18127 2024

Facile Synthesis of Pd Nanosheets and Implications for Superior Catalytic Activity Reviewed

Sumiya Ando, Eisuke Yamamoto, Makoto Kobayashi, Akichika Kumatani, Minoru Osada

ACS Nano Vol. 18 ( 1 ) page： 461 - 469 2023.11

Gigantic Thermal Shielding in 2D Oxide Nanosheets. Reviewed International journal

Hirofumi Tsunematsu, Yue Shi, Eisuke Yamamoto, Makoto Kobayashi, Tomohiro Yoshida, Minoru Osada

ACS nano Vol. 17 ( 12 ) page： 11396 - 11405 2023.6

Language：English Publishing type：Research paper (scientific journal)

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

Ultrahigh Energy Storage in 2D High-κ Perovskites. Reviewed International journal

Hyung-Jun Kim, Shu Morita, Ki-Nam Byun, Yue Shi, Takaaki Taniguchi, Eisuke Yamamoto, Makoto Kobayashi, Yasuo Ebina, Takayoshi Sasaki, Minoru Osada

Nano letters Vol. 23 ( 9 ) page： 3788 - 3795 2023.5

Language：English Publishing type：Research paper (scientific journal)

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

2D Bismuth Oxyfluorides: A New Member of Cationic Nanosheets Reviewed Open Access

Makoto Kobayashi, Tsubasa Tasaka, Eisuke Yamamoto, Minoru Osada

Chemistry Letters Vol. 52 ( 6 ) page： 449 - 451 2023.4

Pseudo-Topotactic Transformation from Oxide Nanosheets to Amorphous Nanosheets Reviewed Open Access

Hikaru Sugimoto, Makoto Kobayashi, Eisuke Yamamoto, Minoru Osada

Chemistry Letters Vol. 52 ( 5 ) page： 322 - 324 2023.4

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

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

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN Vol. 131 ( 4 ) page： 77 - 82 2023.4

Language：English Publishing type：Research paper (scientific journal) Publisher：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. Langmuir–Blodgett 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 (∼7 J cm−3) and efficiency (∼78 %) even in the ultrathin form (∼20 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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Papers - KOBAYASHI Makoto