Article
Nanoscience & Nanotechnology
Aiyang Wang, Chun Liu, Lanxin Hu, Tian Tian, Qianglong He, Weimin Wang, Hao Wang, Zhengyi Fu
Summary: This study investigated the effects of different sources of graphene and homogenization methods on the microstructure and mechanical properties of B4C composites. The results showed that different homogenization methods led to variations in fracture toughness and flexural strength of the B4C composites. Fractography revealed processing flaws as the main fracture origins in the form of structural heterogeneities, graphene agglomerations, and interfacial porosity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Negar Zebardastan, Jonathan Bradford, Josh Lipton-Duffin, Jennifer MacLeod, Kostya (Ken) Ostrikov, Massimo Tomellini, Nunzio Motta
Summary: Face-to-face annealing is an effective method for obtaining epitaxial graphene with precise control over size, quality, growth rate and thickness.
Article
Nanoscience & Nanotechnology
Shaoen Jin, Hang Zheng, Junyu Zong, Xuedong Xie, Fan Yu, Wang Chen, Libo Gao, Can Wang, Yi Zhang
Summary: The study demonstrates the etching growth mechanism of a h-BN film on graphene, showing the element composition, chemical bonding formation, and the formation of the new R0 degrees graphene through experiments and measurements. It provides a deeper understanding for further research on h-BN/graphene heterojunctions.
Article
Chemistry, Multidisciplinary
Yuning Wang, Yipu Qu, Yu Xu, Didi Li, Zhengqian Lu, Jianjie Li, Xujun Su, Guobin Wang, Lin Shi, Xionghui Zeng, Jianfeng Wang, Bing Cao, Ke Xu
Summary: Remote epitaxy (RE) is a prospective universal growth strategy that utilizes the penetration of substrate polarity through two-dimensional materials (2DMs) to act on the epi-layer. However, the role of 2DMs in RE has not been deeply investigated. This study realizes the RE of single-crystal films on the weakest polarity/iconicity substrate and reveals its essence physical properties.
Article
Materials Science, Multidisciplinary
Alexandre Brillon, Justo Garcia, Fanny Riallant, Christian Garnier, Anne Joulain, Yongfeng Lu, Jean-Francois Silvain
Summary: Aluminum matrix composites with boron carbide reinforcements were fabricated using solid state powder metallurgy and hot-pressing process. The incorporation of B4C particles up to 12% increased the hardness and strain hardening threshold of the composite material, but decreased ductility. The thermal conductivity and coefficient of thermal expansion also decreased with an increase in B4C volume fraction.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Martin Zubcak, Jaroslav Soltes, Mariia Zimina, Thomas Weinberger, Norbert Enzinger
Summary: This study investigates the production of aluminium-boron carbide metal matrix composites (Al-B4C MMCs) using Friction Stir Additive Processing (FSAP), showing successful production and evaluating the mechanical and thermal neutron absorbing properties. Neutron irradiation leads to a slight increase in hardness, while its effect on tensile properties remains inconclusive.
Article
Physics, Applied
Takatoshi Yamada, Tomoaki Masuzawa, Yuki Okigawa
Summary: To enhance the carrier mobility and suppress the intrinsic carrier density of graphene on a silicon dioxide substrate, a potassium-doped nano graphene intermediate layer was introduced. Electrical properties of the fabricated graphene field-effect transistors were measured, and the results showed a shift in the Dirac point and increased carrier density and mobility. The ionized potassium atoms in the intermediate layer shielded the electric force from the negatively charged impurities, resulting in improved field-effect mobilities.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ye-Chuang Han, Shi-Hao Yin, Jun-Rong Zheng, Yuan-Fei Hu, Li Sun, Li Zhang, Zhong-Qun Tian, Jun Yi
Summary: This study reports a thermal shock annealing method that enables fast and high-quality epitaxial growth of graphene on SiC. The method effectively mitigates structural defects and improves the flatness of graphene on SiC. The study also demonstrates the significant enhancement of surface-enhanced infrared absorption using graphene on SiC.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Ceramics
Bo Wang, Delong Cai, Haoyi Wang, Wenhua Zou, Zhihua Yang, Xiaoming Duan, Peigang He, Daxin Li, Wenjiu Duan, Dechang Jia, Hua-Tay Lin, Chao Zhao, Yu Zhou
Summary: Boron carbide (B4C) ceramic composites with excellent mechanical properties were fabricated using B4C, silicon carbide (SiC), titanium boride (TiB2), and magnesium aluminum silicate (MAS) as raw materials. The influences of SiC and TiB2 content on the microstructural evolution and mechanical properties of the composites were investigated. MAS in the composites effectively removes oxide layers from ceramic particles during high temperature sintering. The toughening mechanism of the composites is mainly attributed to crack deflection along the grain boundary caused by thermal expansion mismatch between B4C and TiB2.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Li Tan, Xianming Lu, Ning Liu, Qi-Long Yan
Summary: The study successfully enhanced the thermostability of NBTTP and NPTTP crystals through PDA and GO coating, making them suitable for high-performance energetic materials. The major gaseous products of NBTTP composites are CO2, C2H2, N2O, -C=N, CO, NO, and H2O, while volatile hydrocarbon products appear in NPTTP composites, responsible for slower reaction rates.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Lei Fan, Xiaowei Song, Pengfei Zhao, Shoulei Yang, Mengwen Zhang, Linan An
Summary: In this study, super strong B4C ceramic was prepared using dynamic sinter forging (DSF), with a flexural strength of 935 MPa and a hardness of 39.2 GPa. The strength is significantly higher than any previously reported values, while the hardness is one of the highest ever reported. These exceptional mechanical properties are attributed to the particle rearrangement and plastic deformation generated by the oscillatory pressure during dynamic hot forging. The findings suggest that DSF is a promising technique for producing high-performance B4C ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Mahmut Can Senel, Mevlut Gurbuz
Summary: The addition of boron carbide and graphene to aluminum hybrid composites significantly improved Vickers hardness and compressive strength, with the best performance achieved at 30% boron carbide and 0.15% graphene content.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Remy Pawlak, Ernst Meyer, Khalid N. Anindya, Toshiki Shimizu, Jung-Ching Liu, Takumi Sakamaki, Rui Shang, Alain Rochefort, Eiichi Nakamura
Summary: The substitution of heteroatoms and non-benzenoid carbons in nanographene structure allows for atomic engineering of electronic properties. This study demonstrates the bottom-up synthesis of graphene nanoribbons with embedded BN-doped rubicene components using on-surface chemistry. The incorporation of BN heteroatoms results in an increased electronic band gap, providing opportunities for designing semiconducting graphene nanoribbons with optoelectronic properties.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Alexander Mehler, Nicolas Neel, Elena Voloshina, Yuriy Dedkov, Jorg Kroger
Summary: The study demonstrates the growth of graphene on h-BN through thermal decomposition and catalytic assistance of metal substrates, as well as the epitaxial growth of h-BN on Pt(111). Different honeycomb structures of graphene on h-BN and the observation of distinct superstructures at small probe-surface distances are highlighted in this study.
Article
Multidisciplinary Sciences
Salah S. Hamd, Asmiet Ramizy, Raid A. Ismail
Summary: In this study, boron carbide nanoparticles were synthesized using pulsed laser ablation method and the effect of laser pulse numbers on their properties was investigated. The results showed that the optical band gap decreased with increasing laser pulses, and the optical, structural and electrical properties of the samples were also influenced.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Akira Endo, Jianfeng Bao, Wataru Norimatsu, Michiko Kusunoki, Shingo Katsumoto, Yasuhiro Iye
PHILOSOPHICAL MAGAZINE
(2017)
Article
Physics, Applied
Keita Matsuda, Wataru Norimatsu, Jianfeng Bao, Hiroshi Kawarada, Michiko Kusunoki
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Physics, Applied
Masafumi Inaba, Kazuyoshi Ohara, Megumi Shibuya, Takumi Ochiai, Daisuke Yokoyama, Wataru Norimatsu, Michiko Kusunoki, Hiroshi Kawarada
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Chemistry, Physical
Hirotaka Imaeda, Takeshi Koyama, Hideo Kishida, Kenji Kawahara, Hiroki Ago, Ryotaro Sakakibara, Wataru Norimatsu, Tomo-o Terasawa, Jianfeng Bao, Michiko Kusunoki
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Nanoscience & Nanotechnology
Yuika Saito, Kenshiro Tokiwa, Takahiro Kondo, Jianfeng Bao, Tomo-o Terasawa, Wataru Norimatsu, Michiko Kusunoki
Article
Nanoscience & Nanotechnology
Wataru Norimatsu, Keita Matsuda, Tomo-o Terasawa, Nao Takata, Atsushi Masumori, Keita Ito, Koji Oda, Takahiro Ito, Akira Endo, Ryoji Funahashi, Michiko Kusunoki
Article
Physics, Applied
Tatsuya Sumi, Kazuki Nagai, Jianfeng Bao, Tomo-o Terasawa, Wataru Norimatsu, Michiko Kusunoki, Yusuke Wakabayashi
APPLIED PHYSICS LETTERS
(2020)
Article
Chemistry, Physical
Kensuke Saito, Tomonari Koishi, Jianfeng Bao, Wataru Norimatsu, Michiko Kusunoki, Hideo Kishida, Takeshi Koyama
Summary: This study reveals that bilayer graphene exhibits longer and stronger photoluminescence compared to monolayer graphene in femtosecond excitation, with a higher carrier temperature. This suggests that bilayer graphene has superior light-emitting properties and potential for graphene-based light-emitting devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Munekazu Motoyama, Keita Miyoshi, Satoshi Yamamoto, Ryotaro Sakakibara, Yuta Yamamoto, Takayuki Yamamoto, Wataru Norimatsu, Yasutoshi Iriyama
Summary: The Li+ desolvation process is seen as a limiting factor in lithium-ion batteries with a graphite anode, but it is absent in solid-state batteries. Thin-film all-solid-state cells using LiPON electrolyte and multilayer-graphene (MGr) film exhibit low charge transfer resistance at the LiPON/MGr interface, with the main overpotential coming from ohmic loss of LiPON rather than interface issues, allowing for a capacity retention of 60% even at 900C.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Keiju Sato, Naoki Hayashi, Takahiro Ito, Noriyuki Masago, Makoto Takamura, Mitsuru Morimoto, Takuji Maekawa, Doyoon Lee, Kuan Qiao, Jeehwan Kim, Keisuke Nakagahara, Katsunori Wakabayashi, Hiroki Hibino, Wataru Norimatsu
Summary: Researchers fabricated twisted bilayer graphene samples with an area exceeding 3 x 5 mm(2) and observed a flat band and large bandgap using angle-resolved photoemission spectroscopy, indicating the presence of superconductivity.
COMMUNICATIONS MATERIALS
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
T. Okamoto, A. Sasagawa, Y. Harada, S. Nakano, W. Norimatsu, M. Kusunoki, Y. Kawano
2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)
(2018)
Proceedings Paper
Physics, Applied
A. Endo, S. Katsumoto, K. Matsuda, W. Norimatsu, M. Kusunoki
28TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT28)
(2018)
Article
Multidisciplinary Sciences
Shiori Kawamura, Kazuki Matsubara, Sotaro Sakai, Kazuhisa Sasaki, Masataro Saito, Kenji Saito, Masayuki Yagi, Wataru Norimatsu, Ryo Sasai, Michiko Kusunoki, Miharu Eguchi, Shu Yin, Yusuke Asakura, Tatsuto Yui
Proceedings Paper
Electrochemistry
K. Nagashio, Y. Hattori, N. Takahashi, T. Taniguchi, K. Watanabe, J. Bao, W. Norimatsu, M. Kusunoki
2017 INTERNATIONAL CONFERENCE ON SEMICONDUCTOR TECHNOLOGY FOR ULTRA LARGE SCALE INTEGRATED CIRCUITS AND THIN FILM TRANSISTORS (ULSIC VS. TFT 6)
(2017)
Article
Materials Science, Multidisciplinary
Katsuaki Sugawara, Norifumi Yamamura, Keita Matsuda, Wataru Norimatsu, Michiko Kusunoki, Takafumi Sato, Takashi Takahashi
NPG ASIA MATERIALS
(2018)