Article
Chemistry, Multidisciplinary
Kuan Qiao, Yunpeng Liu, Chansoo Kim, Richard J. Molnar, Tom Osadchy, Wenhao Li, Xuechun Sun, Huashan Li, Rachael L. Myers-Ward, Doyoon Lee, Shruti Subramanian, Hyunseok Kim, Kuangye Lu, Joshua A. Robinson, Wei Kong, Jeehwan Kim
Summary: This research demonstrates a novel platform based on graphitized SiC for fabricating high-quality free-standing membranes, achieving significantly improved nucleation and convergent quality of GaN on the GBL. Additionally, the GBL surface exhibits excellent resistance to harsh growth environments, enabling substrate reuse through repeated growth and exfoliation.
Article
Materials Science, Multidisciplinary
A. A. Rybkina, S. O. Filnov, A. Tarasov, D. Danilov, M. Likholetova, V. Yu Voroshnin, D. A. Pudikov, D. A. Glazkova, A. Eryzhenkov, I. A. Eliseyev, V. Yu Davydov, A. M. Shikin, A. G. Rybkin
Summary: The electronic and crystal structure of zero-layer graphene grown on 6H-SiC(0001) is modified after Co intercalation, transforming into a graphene monolayer with CoSi/CoSi2 structure formed between graphene and SiC substrate. The magnetic properties show ferromagnetic behavior with an open hysteresis loop, and the Dirac cone characteristic of quasi-freestanding graphene is observed.
Article
Biochemistry & Molecular Biology
Xingyun Luo, Guojun Liang, Yanlu Li, Fapeng Yu, Xian Zhao
Summary: By using metal intercalations such as Ge and Sn, it is possible to modulate and achieve different conductive types of graphene. Interesting magnetic properties can be introduced to the intercalation structures without affecting the magnetism of graphene. This has significant implications for developing novel graphene-based spintronic and electric devices on SiC substrate.
Article
Chemistry, Physical
Yemima Ehrnst, Heba Ahmed, Robert Komljenovic, Emily Massahud, Nick A. Shepelin, Peter C. Sherrell, Amanda Ellis, Amgad R. Rezk, Leslie Y. Yeo
Summary: In this study, we reported an acoustomicrofluidic method for the rapid synthesis of homogeneous MOF/graphene oxide (GO) planar heterostructures without the need for additives. The method successfully templated quasi-2D MOF crystals onto GO sheets, forming stacked layers. Compared to the traditional 3D copper-based MOF, the quasi-2D MOFs have exposed Cu sites that facilitate efficient coordination with GO. The freestanding membranes constructed with this structure exhibit excellent reduction resistance and integrity of the MOF crystal structure.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Yuhan Chen, Yunbiao Zhao, Dong Han, Dongpo Fu, Yi Chen, Danqing Zhou, Yue Li, Xu Wang, Ziqiang Zhao
Summary: This paper presents a method for synthesizing high-quality patterned graphene on 6H-SiC substrate using ion implantation and thermal annealing, which requires lower temperature and avoids the use of large amounts of gases compared to existing techniques. The approach enables precise control over growth sites for patterned graphene synthesis.
Article
Physics, Applied
Yong Han, James W. Evans, Michael C. Tringides
Summary: The study investigates the kinetic process of foreign guest atom intercalation into graphene layers and provides numerical values for the critical energy barriers through theoretical calculations.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Sachin Sharma, Rachael L. Myers-Ward, Kurt D. Gaskill, Ioannis Chatzakis
Summary: In this study, femtosecond-THz optical pump probe spectroscopy was used to investigate the cooling dynamics of hot carriers in quasi-free standing bilayer epitaxial graphene with hydrogen intercalation. We observed longer decay time constants, ranging from 2.6 to 6.4 ps, compared to previous studies on monolayer graphene, and these times increased non-linearly with excitation intensity. The increased relaxation times were attributed to the decoupling of the graphene layer from the SiC substrate after hydrogen intercalation, which increased the distance between graphene and substrate. Furthermore, our measurements showed that the supercollision mechanism was not related to the cooling process of hot carriers, which was primarily achieved through electron-optical phonon scattering.
NANOSCALE ADVANCES
(2023)
Article
Materials Science, Ceramics
M. Shahriari, M. Zakeri, M. Razavi, M. R. Rahimipour
Summary: The HfB2-HfC-SiC nanocomposite was successfully produced using spark plasma for the first time, with a self-propagating mode during synthesis and completion at temperatures below 400 degrees Celsius. Thermodynamic calculations and X-ray diffraction confirmed the formation of HfB2, HfC, and SiC phases, with respective crystallite sizes of about 54, 26, and 43 nm determined using the Rietveld method.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Paolo Fortugno, Stanislav Musikhin, Xian Shi, Hai Wang, Hartmut Wiggers, Christof Schulz
Summary: In this study, the role of oxygen in gas-phase synthesis of graphene in atmospheric hydrocarbon-fed microwave plasmas was systematically investigated. It was found that ethanol resulted in the formation of pure few-layer graphene, while ethylene produced a mixture of carbon allotropes. The addition of water or reduction of ethylene flow rate promoted the formation of graphene.
Article
Materials Science, Multidisciplinary
Fei Li, Wei Cui, Zhaobo Tian, Jie Zhang, Songmo Du, Zhanglin Chen, Shijia Zhang, Kexin Chen, Guanghua Liu
Summary: High-purity SiC/graphene powders with controllable core-shell structure were successfully prepared by combustion synthesis. The thickness of synthesized graphene was regulated by changing the Mg/SiC mass ratio, and the interface between SiC and graphene was well bonded. These powders have great potential for various applications.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Jia-Li Chen, Pei-Yu Ji, Cheng-Gang Jin, Lan-Jian Zhuge, Xue-Mei Wu
Summary: An approach to the rapid preparation of wide-bandgap SiC/GNSs composites using a high-density HWP source was reported. The microstructure and morphology of the composites were characterized, confirming the potential for broad applications.
Article
Chemistry, Physical
Yannick Bleu, Florent Bourquard, Jean-Yves Michalon, Yaya Lefkir, Stephanie Reynaud, Anne-Sophie Loir, Vincent Barnier, Florence Garrelie, Christophe Donnet
Summary: This study demonstrates the transformation of amorphous carbon into free transfer graphene through pulsed laser deposition, with a focus on the dewetting process of the nickel catalyst film. By varying the thickness and temperature of pure nickel film, graphene synthesis on SiO2 substrate is achieved directly by controlling the parameters of nickel catalyst.
APPLIED SURFACE SCIENCE
(2021)
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
Chemistry, Multidisciplinary
M. Adeel Zafar, Yang Liu, Francisco C. Robles Hernandez, Oomman K. Varghese, Mohan Jacob
Summary: Atmospheric pressure microwave plasma is used for the synthesis of graphene nanosheets using a sustainable precursor called tea tree. The process is performed in a single step at a low microwave power of 200 W. The graphene synthesized shows excellent sensing capability for detecting diuron herbicide, with a linear range of 20 μm to 1 mm and a limit of detection of 5 μm.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Kristupas Kazimieras Tikuisis, Adam Dubroka, Klara Uhlirova, Florian Speck, Thomas Seyller, Maria Losurdo, Milan Orlita, Martin Veis
Summary: We studied the optical properties of quasi-freestanding epitaxial monolayer graphene grown on the Si face of 6H-SiC (0001) in a broad spectral range from midinfrared to ultraviolet. The sample was intercalated with hydrogen after growth to eliminate dangling bonds between the substrate and graphene layer. The dielectric function of graphene was characterized by spectroscopic ellipsometry, and the sample was found to be very similar to exfoliated graphene in terms of optical properties. Spectral dependence of the complex dielectric function of the quasi-freestanding graphene was determined in a broad spectral range.
PHYSICAL REVIEW MATERIALS
(2023)
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
Physics, Applied
Bowen Qiang, Takeru Fukasawa, Tetsuya Hajiri, Takahiro Ito, Takehiko Hihara, Hidefumi Asano
Summary: The magnetic phase diagram and topological Hall effect (THE) of Co2-xPdxMo3N thin films were studied using magnetization and transport measurements. The research reveals a rich phase diagram in the temperature versus Pd content x plane, with different magnetic behaviors and a low-temperature phase found in different regions. Particularly, a prominent topological Hall effect was observed in films with certain Pd content.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Tomo-o Terasawa, Kazuya Matsunaga, Naoki Hayashi, Takahiro Ito, Shin-ichiro Tanaka, Satoshi Yasuda, Hidehito Asaoka
Summary: This study presents angle-resolved photoemission spectroscopy and density functional calculation of graphene on a Hex-Au(001) surface. It is found that hybridization between graphene and gold leads to the generation of a bandgap and potential spin injection. The one-dimensional potential of graphene is too small to modify its electronic structure, but a bandgap of 0.2 eV is observed at the crossing point of graphene pi and Au 6sp bands.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
B. W. Qiang, T. Fukasawa, T. Hajiri, T. Ito, T. Hihara, H. Asano
Summary: In this study, Hall transport and non-collinear magnetoresistance (NCMR) were investigated for a chiral antiferromagnet with the filled beta-Mn-type structure. It was found that epitaxial thin films of Co2-xPdxMo3N exhibited canted antiferromagnetic behavior above room temperature, but thin films with x = 1.01 to 1.38 underwent a transition to a spin spiral state with a higher magnetic moment at lower temperatures. The low-temperature phase showed large anomalous Hall effect (AHE) and topological Hall effect (THE), indicating the formation of topological spin textures.
Article
Nanoscience & Nanotechnology
Hidetoshi Miyazaki, Tetsuya Hajiri, Masaharu Matsunami, Manabu Inukai, Takahiro Ito, Shin-ichi Kimura
Summary: The electronic structure, exchange splitting energy (Delta E-EX), and ferromagnetic phase transition temperature (T-C) of single-crystalline EuO (100) ultrathin films were studied using temperature- and thickness-dependent angle-resolved photoemission spectroscopy. It was found that both Delta E-EX and T-C decreased as the film thickness decreased. The band shift showed opposite thickness dependencies at the Gamma and X points, indicating the balance between hybridization of Eu 4f and O 2p states (super-exchange interaction) and that of Eu 4f, O 2p, and Eu 5d states (indirect-exchange interaction). The transition from an indirect energy gap in bulk EuO to a direct gap in ultrathin films of ferromagnetic semiconductor EuO could have potential applications in future spintronic devices.
FRONTIERS IN NANOTECHNOLOGY
(2022)
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)
Article
Materials Science, Multidisciplinary
Damir Pinek, Takahiro Ito, Kanji Furuta, Arnoldus J. van Bunningen, Patrick Le Fevre, Francois Bertran, Thierry Ouisse
Summary: In this experimental study using ARPES, the electronic states of the nanolamellar compound Ti2SnC were investigated. The observed Fermi surface is formed by a combination of quasi-two-dimensional corrugated tubes and quasi-one-dimensional thin plates, with a clear Dirac-like dispersion and an evanescent surface state.
Article
Materials Science, Multidisciplinary
Maxime Barbier, Fabrice Wilhelm, Damir Pinek, Kanji Furuta, Takahiro Ito, Youngsoo Kim, Maelys Magnier, Daniel Braithwaite, Michal Valiska, Christine Opagiste, Michel W. Barsoum, Philippe Ohresser, Edwige Otero, Patrick Le Fevre, Francois Bertran, Gaston Garbarino, Andrei Rogalev, Thierry Ouisse
Article
Materials Science, Multidisciplinary
Damir Pinek, Takahiro Ito, Kanji Furuta, Youngsoo Kim, Masashi Ikemoto, Shin-ichiro Ideta, Kiyohisa Tanaka, Masashi Nakatake, Patrick Le Fevre, Francois Bertran, Thierry Ouisse
Article
Materials Science, Multidisciplinary
H. Nakamura, A. Mohammed, Ph Rosenzweig, K. Matsuda, K. Nowakowski, K. Kuester, P. Wochner, S. Ibrahimkutty, U. Wedig, H. Hussain, J. Rawle, C. Nicklin, B. Stuhlhofer, G. Cristiani, G. Logvenov, H. Takagi, U. Starke