Review
Chemistry, Multidisciplinary
Sejeong Kim
Summary: Two-dimensional materials have been widely used in various scientific research areas and the concept of constructing photonic devices exclusively from 2D materials has emerged. This review introduces photonic devices solely consisting of 2D materials, including photonic waveguides, lenses, and optical cavities. These devices enable the thinnest possible devices due to their high refractive index, and the unique characteristics of 2D materials may provide intriguing applications.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Physical
Gayatree Barik, Sourav Pal
Summary: By systematically studying the stability, electronic structure, Li adsorption, and diffusion properties of the graphene/blueP/MoS2 van der Waals trilayer heterostructure, it was found that this structure has the potential to be used as a material for Li-ion batteries, displaying strong performance characteristics.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Maja Varga Pajtler, Igor Lukacevic, Vanja Dusic, Matko Muzevic
Summary: It has been demonstrated that combining 2D materials in heterostructures can greatly modify their electronic properties, making them more versatile for various applications. In this study, we utilized first principle calculations to explore the impact of Li adsorption on lateral heterostructures composed of graphene and hexagonal boron nitride nanoribbons. The results indicate that the nanoribbon interface plays a vital role. Compared to individual graphene or boron nitride nanoribbons, Li atoms exhibit stronger adsorption at their lateral interface due to electronic states hybridization. This leads to significant changes in the electronic band structure. Notably, Li adsorption can induce a transition from metallic to semiconducting behavior in boron-terminated zigzag nanoribbon interface, opening an indirect bandgap of approximately 0.2 eV.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Zhonglin Cao, Prakarsh Yadav, Amir Barati Farimani
Summary: This study compares the performance of nanoporous graphene, MoS2, and MXene in DNA detection through extensive molecular dynamics simulations. It is found that graphene nanopore is the most sensitive in distinguishing DNA bases, while MoS2 is better than graphene and MXene in distinguishing A and T bases from C and G bases.
Article
Environmental Sciences
Mengdie Yu, Xingzhong Yuan, Jiayin Guo, Ning Tang, Shujing Ye, Jie Liang, Longbo Jiang
Summary: From the viewpoint of sustainability, graphene-like metal-free 2D nanomaterials (GMFs) show great potential in various photocatalytic fields due to their unique structures and properties. Despite highly similar lattice structures, the properties of these nanomaterials vary greatly, leading to multifunctionalities in the photocatalytic process. This review summarizes the latest progress of GMFs and their hybrid composites in the field of photocatalysis, highlighting their 2D structure and key photocatalytic properties, as well as emphasizing their multiple roles in enhancing the activity of composite photocatalysts. The review also discusses the hybridization of 2D metal-free materials and elaborates on the merits of 2D/2D hybrid systems, concluding with some remarks on understanding their strengths and weaknesses and proposing future challenges and perspectives in this emerging field.
Article
Chemistry, Multidisciplinary
Huibin Sun, Yunlei Jiang, Renjie Hua, Runhua Huang, Lei Shi, Yuan Dong, Suxia Liang, Jing Ni, Chi Zhang, Ruoyu Dong, Yingru Song
Summary: Graphene/BN heterostructures exhibit significant thermal rectification behavior, and the rectification ratio increases with the system length. This phenomenon is attributed to the mismatch of out-of-plane phonon vibration modes at the interface. This two-dimensional heterostructure shows promise for thermal management.
Article
Chemistry, Multidisciplinary
Ziqian Jia, Guotong Wang, Liya Wang, Chun Tang, Chengyuan Wang
Summary: A two dimensional hybrid structure was fabricated by doping graphene with hexagonal boron nitride cells, leading to substantial changes in the material's properties. Molecular dynamics simulations were used to explore the tensile behavior of the structure and its fracture mechanisms, revealing the impact of the BN cells on its overall tensile properties. The study also found that free boundaries could significantly decrease elastic moduli and fracture stress while enhancing fracture toughness of the 2D nanosheets.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
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
Materials Science, Multidisciplinary
Jiayi Hu, Anqi Zheng, Er Pan, Jiangang Chen, Renji Bian, Jinyao Li, Qing Liu, Guiming Cao, Peng Meng, Xian Jian, Alexander Molnar, Yulian Vysochanskii, Fucai Liu
Summary: Due to their unique nanoporous structure, 2D metal thiophosphate SnP2S6 exhibits promising optoelectronic properties, making it a good candidate for transistor devices. When used as a dielectric layer with MoS2 transistors, it shows high dielectric constant, low subthreshold slope, and excellent stability with negligible hysteresis, indicating potential for future device applications. This research could pave the way for the discovery of new metal thiophosphate systems with enhanced properties.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Xin Wu, Ruxue Yang, Xiyue Chen, Wei Liu
Summary: This study proposes the use of ion beam irradiation for creating nanopore structure in 2D vdW graphene-MoS2 heterostructures and investigates the formation process and optimal irradiation parameters. The mechanical performance of the heterostructure under loading conditions is demonstrated by considering the stacking order of the heterostructure 2D layers.
Article
Multidisciplinary Sciences
Y. Dong, L. Xiong, I. Y. Phinney, Z. Sun, R. Jing, A. S. McLeod, S. Zhang, S. Liu, F. L. Ruta, H. Gao, Z. Dong, R. Pan, J. H. Edgar, P. Jarillo-Herrero, L. S. Levitov, A. J. Millis, M. M. Fogler, D. A. Bandurin, D. N. Basov
Summary: The phenomenon of dragging light by moving media, predicted by Fresnel and verified by Fizeau, plays a key role in Einstein's special relativity theory. While experiments on dragging photons by an electron flow in solids have inconsistencies, the dragging of surface plasmon polaritons by an electron flow in graphene is a unique and complex phenomenon that challenges simple kinematics explanations.
Article
Chemistry, Multidisciplinary
Revannath Dnyandeo Nikam, Jongwon Lee, Wooseok Choi, Writam Banerjee, Myonghoon Kwak, Manoj Yadav, Hyunsang Hwang
Summary: The report highlights the use of atomic sieves in atomically thin 2D materials to address limitations in ECRAM devices, resulting in efficient ion transport paths and analog switching efficiency. The one-atom-thick hBN confines the ion transport area to small pores within each hexagonal ring, with experimental evidence showing an activation energy barrier of approximately 0.51 eV for H+ ion transport through single-layer hBN.
Article
Chemistry, Multidisciplinary
Jinpeng Huo, Guisheng Zou, Yu Xiao, Tianming Sun, Bin Feng, Daozhi Shen, Luchan Lin, Wengan Wang, A. Zhanwen, Lei Liu
Summary: This study demonstrates a novel BN-encapsulated CuO/MoS2 2D-1D van der Waals heterostructure photodetector with significantly improved interfacial contact and photodetection capabilities. The device shows highly sensitive, gate-tunable, and robust photoelectronic properties, and h-BN encapsulation effectively protects the device from electrical depletion by gas molecules, greatly improving stability and service life.
MATERIALS HORIZONS
(2023)
Article
Engineering, Environmental
K. Harikrishnan, Gajendar Singh, Amisha Kushwaha, Varun Pratap Singh, Umesh Kumar Gaur, Manu Sharma
Summary: The presence of organic pollutants in the environment poses significant health risks, therefore, monitoring and controlling their levels is imperative. In this study, g-C3N4/BN nanocomposites were synthesized and used as a basis for an electrochemical sensor for detecting hazardous hydroquinone. The sensor demonstrated good sensitivity and practicality.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Siming Ren, Yanbin Shi, Chaozhi Zhang, Mingjun Cui, Jibin Pu
Summary: The thermal stability of two-dimensional molybdenum disulfide (MoS2) and its heterostructures has attracted considerable interest due to its profound applications in electronics. In this study, the oxidation behavior of continuous MoS2 films was investigated at increasing temperatures using a precision muffle furnace. The results showed that monolayer MoS2 exhibited less oxidation and better thermal stability at 340 degrees C compared to few-layer MoS2 films, which were completely oxidized at 280 degrees C. Additionally, the MoS2/h-BN heterostructure displayed anomalous oxidation behavior, with the h-BN film remaining undamaged while the underlying monolayer MoS2 film was completely oxidized at 340 degrees C. This behavior was attributed to the increased tensile strain in the MoS2 film at elevated temperature.
Article
Engineering, Industrial
Rongyan Sun, Xu Yang, Kenta Arima, Kentaro Kawai, Kazuya Yamamura
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2020)
Article
Chemistry, Physical
Xiaozhe Yang, Xu Yang, Kentaro Kawai, Kenta Arima, Kazuya Yamamura
Summary: The study investigated factors affecting the anodic oxidation rate of SiC and found that electrolyte temperature, surface damage, doping concentration, and strain all have a promotional effect on SiC anodic oxidation. The relationship between strain on the SiC surface and anodic oxidation rate was quantitatively studied by a strain-controllable anodic oxidation device, showing that both compressive and tensile strains increase the anodic oxidation rate of SiC. The study is expected to guide the improvement of ECMP efficiency and contribute to its practical application.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Nian Liu, Hideaki Yamada, Naoya Yoshitaka, Kentaro Sugimoto, Rongyan Sun, Kentaro Kawai, Kenta Arima, Kazuya Yamamura
Summary: The study found that mechanical polishing resulted in surface and subsurface damage on mosaic single-crystal diamond, while plasma-assisted polishing successfully removed such damage. These differences were observed through various measurements like scanning white-light interferometer, scanning cathodoluminescence, and MicroRaman spectroscopy.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Electrochemistry
Xiaozhe Yang, Xu Yang, Haiyang Gu, Kentaro Kawai, Kenta Arima, Kazuya Yamamura
Summary: Slurryless electrochemical mechanical polishing is effective for polishing SiC wafers, but the charge utilization efficiency needs to be controlled within a certain range to avoid significant reduction in material removal rate.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Engineering, Multidisciplinary
Rongyan Sun, Atsunori Nozoe, Junji Nagahashi, Kenta Arima, Kentaro Kawai, Kazuya Yamamura
Summary: The self-sharpening of fixed abrasive grinding stones has limitations. A novel dress-free dry polishing process combining plasma-assisted polishing and plasma-assisted dressing has been proposed for high integrity polishing with constant exposure of new abrasives and increased material removal rate (MRR).
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Xu Yang, Xiaozhe Yang, Kentaro Kawai, Kenta Arima, Kazuya Yamamura
Summary: The study proposes a three-step silicon carbide wafer manufacturing process using slurryless electrochemical mechanical polishing, which can rapidly transform an unprocessed SiC wafer to an atomically smooth surface, thereby reducing the cost and manpower required during SiC wafer manufacturing.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Ceramics
Xiaozhe Yang, Xu Yang, Haiyang Gu, Kentaro Kawai, Kenta Arima, Kazuya Yamamura
Summary: This paper proposes a slurryless, highly efficient polishing method called ultrasonic vibration assisted electrochemical mechanical polishing (UAECMP) for achieving subnanometer surface roughness on 4H-SiC wafers. The performance of UAECMP was evaluated and compared to ordinary electrochemical mechanical polishing and mechanical polishing. The results showed that UAECMP achieved a significantly higher material removal rate and that ultrasonic vibration played a crucial role in increasing the anodic oxidation rate. However, increasing the ultrasonic vibration amplitude also led to an increase in surface roughness, suggesting the need for a combined UAECMP and ECMP process.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Nian Liu, Kentaro Sugimoto, Naoya Yoshitaka, Hideaki Yamada, Rongyan Sun, Kentaro Kawai, Kenta Arima, Kazuya Yamamura
Summary: This study systematically investigates the effects of polishing pressure and sliding speed in plasma-assisted polishing (PAP) on single crystal diamond (SCD) substrates. The results show that low polishing pressures lead to a smooth atomic-scale surface, while high pressures result in a rough surface with grooves. Furthermore, the sliding speed has minimal effect on the surface quality parameter.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ayumi Ogasawara, Kentaro Kawai, Kazuya Yamamura, Kenta Arima
Summary: In the field of fuel cells, understanding the catalytic activity of nanocarbons or graphene-based materials for oxygen reduction reaction (ORR) at a microscopic level is crucial. This study presents a novel concept to achieve this understanding through a different approach than conventional electrochemical measurements. The experimental results demonstrate that nanocarbon materials can lead to etched hollows on single-crystalline Ge substrate, and the histogram analysis of these hollows provides quantitative comparison of the catalytic activities of different nanocarbon materials.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Akihito Okamoto, Haruki Bai, Shintaro Toda, Maowei Huang, Hirotake Kajii, Kentaro Kawai, Hirohiko Murakami
Summary: The effect of ZnSe thickness on the properties of green-emitting InP/ZnSe/ZnS QDs was investigated. It was found that an optimum thickness of 1.2 nm for the ZnSe intermediate shell resulted in the narrowest full width at half maximum (FWHM) and highest photoluminescence quantum yield (PLQY). Excessive or insufficient ZnSe thickness broadened FWHM and decreased PLQY.
Article
Biochemical Research Methods
Jiandong Yang, Satoshi Imamura, Yoshikazu Hirai, Toshiyuki Tsuchiya, Osamu Tabata, Ken-ichiro Kamei
Summary: This study presents a gut-liver-axis microphysiological system (GLA-MPS) that integrates individual cell-culture chambers with perfusion flows and a circulation channel via a porous membrane. The system successfully applies physiologically relevant fluid shear stress to gut and liver cells, resulting in high cell survival rates and enhanced expression of functional proteins. The GLA-MPS also allows for the modeling of inflammatory bowel disease through the application of lipopolysaccharide. This advanced in vitro model has significant implications for studying the physiological and pathological roles of the gut-liver-axis and related disease modeling.
Article
Nanoscience & Nanotechnology
Heeyuen Koh, Jae Gyung Lee, Jae Young Lee, Ryan Kim, Osamu Tabata, Jin-Woo Kim, DO-Nyun Kim
Summary: Structural DNA nanotechnology enables the design of nanoscale structures with desired shape and properties through evolved design strategies and computational tools, allowing for fine control over both shape and physicochemical properties of the structure.
IEEE OPEN JOURNAL OF NANOTECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Junhuan Li, Shaoxian Li, Tomoki Higashi, Kentaro Kawai, Kouji Inagaki, Kazuya Yamamura, Kenta Arima
Summary: The study observed a quadrangle lattice resembling a rectangle on a graphene nanosheet on graphite, possibly originating from the unique structure and electron distribution of AGNRs. Wrinkles and adsorbates in graphene play a role similar to an armchair edge, affecting electronic structures.
