Article
Chemistry, Physical
Vivek, Munish Sharma, Raman Sharma
Summary: Plumbene, a newly discovered 2D material, shows promising potential for hydrogen storage due to its controllable hydrogen adsorption and desorption processes on the surface. By decorating with hydrogen on one or both sides, different hydrogen gravimetric densities can be achieved, while the applied electric field can effectively modulate the strength of hydrogen adsorption.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Environmental Sciences
Xiuwei Ma, Linjun Yang, Yong Hou, Lei Zhou
Summary: The adsorption/desorption behaviors of semi-volatile organic compounds in vapor phase by activated carbon were studied through experiments and density functional theory calculation. Increasing temperature inhibited the adsorption of SVOCs on AC, and the strong interaction between SVOCs and active sites affected the desorption temperature.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
Yoshitsugu Kojima, Masakuni Yamaguchi, Haruo Sawa, Katsuhide Kikuchi, Noriyuki Hiramitsu, Masahiko Kimbara, Haruyuki Nakanishi, Yasuhiro Takahashi
Summary: The capacitances of porous carbon anodes were determined using a Ni(OH)(2) cathode. The capacitances were found to be 300-700 F g(-1), which is over 3 times higher than those of carbon anodes prepared by electrical double layer formation, indicating the larger capacitances achieved through protium H adsorption in the presence of highly concentrated KOH solution.
CHEMICAL COMMUNICATIONS
(2022)
Article
Engineering, Chemical
Levie Mweene, Govinda Prasad Khanal, Rudolph J. Kashinga
Summary: Experimental and theoretical analysis showed that using xanthan gum as a selective depressant can effectively separate chalcopyrite from biotite. The adsorption of xanthan gum on chalcopyrite and biotite is pH-dependent, with a chemisorption process observed on both minerals. Analysis using QTAIM and NCI tools indicated that the adsorption of xanthan gum is governed by weak, partial covalent hydrogen bonding and other non-covalent interactions on both chalcopyrite and biotite.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Jen-Chuan Tung, Tsung-Che Li, Yen-Jui Teseng, Po-Liang Liu
Summary: This paper details the growth mechanism of (100)-, (110)-, and (111)-oriented nitrogen-doped diamond films through first-principles density-functional calculations. Nitrogen substitution was found to be beneficial for hydrogen abstraction and subsequent adsorption of methyl molecules, with the (111) orientation surface showing the best performance.
APPLIED SCIENCES-BASEL
(2021)
Article
Crystallography
Evgeny Vasilev, Dmitry Zedgenizov, Dmitry Zamyatin, Igor Klepikov, Anton Antonov
Summary: This study analyzed zonal and sectorial heterogeneities in natural diamonds using CL microscopy, revealing that the relative brightness of growth sectors depends on the nature of defects and imaging methods. The differences between SS-CL and SEM-CL images are attributed to luminescence kinetics and detector sensitivity. Additionally, it was found that hydrogen atoms around lattice defects in diamonds can impact defect transformation kinetics.
Article
Chemistry, Physical
Ying Guo, Jianwen Liu, Qi Yang, Pongtanawat Khemthong, Zhaodong Huang, Yuwei Zhao, Ze Chen, Binbin Dong, Xian-Zhu Fu, Jing-Li Luo, Chunyi Zhi
Summary: The high electron density of acetylene linkages in hydrogen substituted graphdiyne (HsGDY) can regulate nitrogen adsorption and NH3 desorption on active Pd sites, leading to impressive electrocatalytic NRR performance. The optimized Pd/HsGDY shows ultrahigh Faraday efficiency and NH3 yield, favoring a selectively facilitated electrosynthesis of NH3.
Article
Engineering, Environmental
Li Tan, Jiangen Wang, Bihai Cai, Chengyin Wang, Zhimin Ao, Shaobin Wang
Summary: Disc-like nitrogen-rich porous carbon materials (HAT-Xs) were synthesized with different C/N ratios by controlling the synthesis temperature. Among them, HAT-650 synthesized at 650 degrees Celsius exhibited the highest adsorption capacity and excellent reusability for ethyl acetate, making it a promising adsorbent for industrial applications.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Energy & Fuels
Hamid Sharifigaliuk, Syed Mohammad Mahmood, Reza Rezaee, Funsho Ayobami Afolabi, Izhar Ul Haq
Summary: The pore characteristics of shale and clay samples were analyzed, and the effect of shale particle size on methane sorption capacity and diffusion was investigated.
Article
Physics, Applied
L. Mehmel, R. Issaoui, O. Brinza, A. Tallaire, V. Mille, J. Delchevalrie, S. Saada, J. C. Arnault, F. Benedic, J. Achard
Summary: By employing a growth strategy based on micrometric laser-pierced hole arrays, the dislocation density in heteroepitaxial chemical vapor deposition diamond can be significantly reduced, reaching an average value equivalent to that typically measured for commercial type Ib single crystal diamonds.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Environmental
Yingshu Liu, Xiaoyong Wu, Xiong Yang, Haiyang Tao, Jinjuan Li, Chuanzhao Zhang, Ralph T. Yang, Ziyi Li
Summary: This study successfully improved the NOx adsorption performance of Cu-ZSM-5 zeolites using a simple and rapid modification method, while reducing the cost of desorption energy. The researchers found that under wet gas stream conditions, the properly-loaded IM sample exhibited significant NO2 desorption characteristics. The study also revealed the advantages of the optimized IM sample in terms of diverse adsorbate states and competitiveness towards water, indicating the potential of the IM method as a sorbent improvement strategy in practical applications.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Yangyu Liu, Arman Peyravi, Xiongbo Dong, Zaher Hashisho, Shuilin Zheng, Xiao Chen, Du Gao, Yongxing Hao, Yuping Tong, Jiuyue Wang
Summary: This study evaluated the adsorption of volatile organic compounds (VOCs) on three different adsorbents and found that the adsorption capacity was influenced by pore size, surface area, and polarity. Palygorskite showed the highest adsorption capacity due to its small total pore volume and large micropore volume. The study also constructed pore models and analyzed the adsorption heat, concentration distribution, and interaction energy, revealing that smaller pores result in higher VOC concentration.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Chemical
Levie Mweene, Govinda Prasad Khanal, Claude Nambaje
Summary: The surface chemical properties of quartz containing iron species and pyrite in the presence of sodium alginate (ALG) as well as bulk solution studies of Fe were investigated experimentally and theoretically. Results show that the adsorption of ALG onto pyrite and quartz containing iron species decreased with increasing pH, and the interactions in the complexes were partially covalent in nature.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Bocheng Qiu, Pan Huang, Cheng Lian, Yingxin Ma, Mingyang Xing, Honglai Liu, Jinlong Zhang
Summary: The incorporation of nickel dopants into few-layer ZnIn2S4 nanosheets enhances electronic conductivity and improves hydrogen adsorption and desorption abilities, resulting in long-lived photo-excited electrons and enhanced photocatalytic hydrogen evolution performance.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Haiyang Tao, Yingshu Liu, Jinjuan Li, Chuanzhao Zhang, Chunyu Zhao, Xiong Yang, Ralph T. Yang, Ziyi Li
Summary: Adsorption is a promising technology for deep purification of nitrogen oxides (NOx) from flue gases and simultaneously recycling NO2. This study conducted experimental evaluations on practical NOx sorption performances on series of zeolites, revealing the impact of zeolite typological structure, compensating cation, and SiO2/Al2O3 ratio on purification efficacy and regenerability. The findings provide insights into the relationships between NOx adsorption performances and zeolite properties.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Applied
Tamotsu Okamoto, Tomoya Igari, Takahiro Fukui, Ryuto Tozawa, Yasuhito Gotoh, Nobuhiro Sato, Yasuki Okuno, Tomohiro Kobayashi, Mitsuru Imaizumi, Masafumi Akiyoshi
Summary: In this study, a compact and radiation-tolerant radiation dosimeter without bias voltage application using CdTe solar cells was proposed for severe radiation environment near a nuclear reactor pressure vessel. The CdTe solar cells showed sufficient tolerance against gamma-ray exposure up to 3 MGy and linearly increased current density with increasing gamma-ray intensity. By stacking and parallel connecting CdTe solar cells, gamma-ray sensitivity was successfully improved, enabling high responsivity and low noise detection even under high flux neutron environments.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Tsunashi Shimizu, Toru Akiyama, Kohji Nakamura, Tomonori Ito, Hiroyuki Kageshima, Masashi Uematsu, Kenji Shiraishi
Summary: Theoretical investigation shows that on the Si-face, NO molecule reacts with the C-C single bond, while on the C-face it reacts with the C=C double bond. The annealing process of NO is crucial for reducing carbon-related defects at the 4H-SiC/SiO2 interface.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Kohei Yata, Hiroyuki Kageshima
Summary: The stability and diffusion barrier height of the O vacancy in Si oxide increase as the oxide is compressed. The diffusion barrier height is determined by the Si-Si distance of the O vacancy. The strain can affect the reliability of the oxide film.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Shengnan Wang, Jack Crowther, Hiroyuki Kageshima, Hiroki Hibino, Yoshitaka Taniyasu
Summary: Chemical vapor deposition growth of hBN/graphene bilayers with high-purity moiré phase and interlayer angles under 0.5 degrees has been demonstrated, leading to enhanced carrier mobility. This approach may contribute to the large-scale fabrication of high-quality van der Waals heterostructures.
Article
Chemistry, Multidisciplinary
Jianbo Liang, Ayaka Kobayashi, Yasuo Shimizu, Yutaka Ohno, Seong-Woo Kim, Koji Koyama, Makoto Kasu, Yasuyoshi Nagai, Naoteru Shigekawa
Summary: The direct integration of GaN and diamond for high-power devices faces challenges due to mismatch in lattice and thermal-expansion coefficients. A successful fabrication of GaN/diamond heterointerface was achieved using a surface activated bonding method at room temperature. An intermediate layer composed of amorphous carbon and diamond is formed at the interface, with Ga and N atoms diffusing during the bonding process and transitioning to diamond after annealing.
ADVANCED MATERIALS
(2021)
Article
Physics, Applied
Hiroyuki Kageshima, Shengnan Wang, Hiroki Hibino
Summary: The role of edge termination in the growth direction selectivity of graphene heterostructures with hexagonal boron nitride has been theoretically studied. Different edge terminations lead to lateral and vertical growth of the heterostructures. The mechanisms behind these different edge terminations are discussed based on H adsorption kinetics.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Applied
Shogo Mizuno, Akio Ohta, Toshiaki Suzuki, Hiroyuki Kageshima, Junji Yuhara, Hiroki Hibino
Summary: The vibrational properties of different Ge phases formed on Ag(111) thin films by the Ge segregation method were investigated using in situ Raman spectroscopy. As the segregation temperature is increased, the striped phase, the less-ordered phase, and the long-range ordered phase appear in that order. The germanene Raman peaks shift to higher wavenumbers with the segregation temperature, which could be due to the reduction of tensile strain in germanene.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Applied
Sayleap Sdoeung, Kohei Sasaki, Katsumi Kawasaki, Jun Hirabayashi, Akito Kuramata, Makoto Kasu
Summary: The surface defects induced by probe attachment play a crucial role in causing reverse leakage current in β-Ga2O3 SBDs, which is essential for the commercialization of power devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Toru Akiyama, Tsunashi Shimizu, Tomonori Ito, Hiroyuki Kageshima, Kenta Chokawa, Kenji Shiraishi
Summary: Theoretical investigations based on ab initio calculations reveal that N atoms incorporation at the 4H-SiC/SiO2 interface is significantly influenced by the plane orientation, with Si-face interface showing higher incorporation energy. The competition between N-incorporation and N-2 desorption plays a crucial role in understanding the atom-scale mechanism.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Toru Akiyama, Tsunashi Shimizu, Tomonori Ito, Hiroyuki Kageshima, Kenji Shiraishi
Summary: Ab initio calculations were used to investigate the reactions of N2O and NH3 molecules at the interface between 4H-SiC and SiO2 during post oxidation annealing (POA). It was found that the reaction of N2O molecule resulted in the desorption of carbon oxide molecules in addition to Si-N bond formation, while the reaction of NH3 molecule led to various atomic configurations depending on the plane orientation. The energy barriers for the N2O and NH3 reactions were higher than that of the NO reaction due to different atomic configurations at the transition state structure.
Article
Physics, Multidisciplinary
Tatsuru Yamada, Keisuke Ochiai, Hirofumi Kinoshita, Shunsuke Sakuragi, Motohiro Suzuki, Hitoshi Osawa, Hiroyuki Kageshima, Tetsuya Sato
Summary: Ferromagnetism was observed in an ultrathin Pt(100) film deposited on a SrTiO3(100) substrate. The ferromagnetism periodically changes with the film thickness, and the orbital magnetic moment of pure Pt is smaller than that of the Pt/ferromagnetic multilayer system.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Applied
Motoki Ohi, Fumiya Fukunaga, Hayate Murakami, Hiroyuki Kageshima, Yasuhide Ohno, Masao Nagase
Summary: In this study, stacked graphene diodes were fabricated via direct bonding using single-crystal graphene on a SiC substrate. Switching and S-shaped negative resistance were observed in the electrical properties of the junction. The high-resistance state switched to the low-resistance state after applying a maximum junction voltage of around 10 V.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Hiroyuki Kageshima, Shengnan Wang, Hiroki Hibino
Summary: The origin of growth direction difference in graphene/hexagonal boron nitride (hBN) heterostructures during chemical vapor deposition (CVD) is theoretically studied. The study focuses on the energy gain with H termination of the bare hBN N edge on the Cu(111) surface compared to the bare graphene edge. The results indicate that the van der Waals correction method greatly affects the differences observed, and the most reliable method supports the speculation that the edge termination of existing islands automatically changes depending on whether it is graphene or hBN.
E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Hiroyuki Kageshima, Toru Akiyama, Kenji Shiraishi
Summary: Using first-principles calculation, the study explores the diffusion path of Si emission from the interface into the Si oxide surface during the Si oxidation process, assuming Si emission primarily consists of SiO interstitial diffusion. The diffusion path was successfully found and the energy profile of the diffusion path can be evaluated. Only three elementary processes were considered, namely O vacancy transfer, coordination number conversion of Si, and ACBD bond order conversion. The results confirm that SiO interstitial moves in the oxide by kicking neighboring Si and O, while absorbed Si and O become part of the oxide and kicked-out Si and O become new SiO interstitials. Comparisons with similar diffusion path in bulk SiO2 crystal showed that the Si oxide layer is relatively flexible, the oxide surface is much more flexible, and the oxide layer near the interface is less flexible due to the rigid Si substrate. These findings indicate the fair assumption of Si emission and the inevitable SiO interstitial diffusion in the oxide film to reduce the impact of volume expansion at the interface.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Physics, Multidisciplinary
Masahiro Hori, Jinya Kume, Manjakavahoaka Razanoelina, Hiroyuki Kageshima, Yukinori Ono
Summary: Recent observations of macroscopic quantum condensation using electron-hole (e-h) bilayers have sparked research into their application in electronics. However, attempts to observe condensation in silicon, the major material in electronics, have been hindered by a lack of technology to form closely-packed and uniform bilayers. In this study, the authors propose a method that utilizes the transient response of carriers to a rapid gate-voltage change, enabling the self-organized formation of bilayers at the metal-oxide-semiconductor interface with an e-h distance as small as the exciton Bohr radius. The findings suggest that the e-h system changes its configuration depending on carrier density, which could lead to the development of low-power cryogenic silicon metal-oxide-semiconductor devices.
COMMUNICATIONS PHYSICS
(2023)
