Article
Chemistry, Multidisciplinary
Zhisheng Peng, Ya Deng, Haonan Wei, Kang Peng, Hui Liu, Jiyou Jin, Zhongpu Wang, Weiguo Chu, Jian Zhang, Yong Jun Li, Zheng Liu, Lianfeng Sun
Summary: This study introduces a novel nanostructure made of seamless junctions between semiconducting single-walled carbon nanotubes and partially unzipped segments, functioning as a nonvolatile memory at room temperature. The device displays electrical hysteresis and can be modulated by external magnetic fields, with the mechanism attributed to magnetic moments at the partially unzipped SWNT. This smaller size and high working temperature of the SWNT may lead to the development of molecular nanomagnets for practical nonvolatile memory applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ruijing Wang, Yuting Jing, Peng Sun, Xuefeng Wang
Summary: In this study, the substrate effect of electrocatalyst on the hydrogen evolution reaction was examined using multiwall carbon nanotubes with different unzipped extent. It was found that partially unzipped MWCNT played a crucial role in achieving high catalytic performance, leading to a lower overpotential and Tafel slope in sulfuric acid.
Article
Chemistry, Multidisciplinary
Wujun Ma, Wanfei Li, Min Li, Qinghui Mao, Zhenghui Pan, Jing Hu, Xin Li, Meifang Zhu, Yuegang Zhang
Summary: A partially unzipped carbon nanotube/reduction graphene oxide hybrid fiber with less dead volume and a well-ordered porous structure was successfully fabricated via wet spinning and chemical reduction. The spinning solution with low viscosity and high concentration ensured smooth spinning and reduced dead volume derived from isolated pores.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Thermodynamics
Shubham P. Chitriv, Ketaki Dharmadhikari, A. Nithin, Akshay S. Archak, R. P. Vijayakumar, Glen Cletus Dsouza
Summary: This study synthesized PCM composites with UMCNOs and PEG through melt mixing method, and investigated the effects of UMCNOs loading on their properties. The results showed that the addition of UMCNOs can significantly enhance the thermal conductivity and thermal energy storage and release rates of the PCM composites, with negligible impact on phase change properties. This suggests great prospects for latent heat energy storage applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Multidisciplinary Sciences
Andoni Ugartemendia, Aran Garcia-Lekue, Elisa Jimenez-Izal
Summary: Recently, silicon atoms have been successfully doped into the edges of single-layer graphene through scanning transmission electron microscopy. In this study, density functional theory is used to model and characterize silicon-doped zigzag-type graphene edges inspired by experiments. The thermodynamic stability is evaluated, and the electronic and magnetic properties of the most relevant edge configurations are revealed. Importantly, it is shown that silicon doping of graphene edges can reverse the spin orientation on adjacent carbon atoms, leading to novel magnetic properties with potential applications in spintronics.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Girish Rughoobur, Lay Jain, Akintunde Akinwande
Summary: Experimental demonstration of electron transmission through suspended graphene layers with significant increase in current, possibly due to generation of secondary electrons by primary electrons. Monolayer graphene shows highest output current at approximately 90 eV, up to 1.7 times the incident current, offering potential for low-voltage field emission electron sources in less stringent vacuum environments.
Article
Chemistry, Multidisciplinary
Kenan Elibol, Peter A. van Aken
Summary: We report the adjustment of charge-transfer-plasmon (CTP) resonances in aluminum bowties on graphene through controlled nanofabrication and focused electron-beam irradiation. The CTP resonances show different frequency shifts and decay behaviors with changes in the junction width and electron-beam irradiation, revealing the tunability and sensitivity of the resonances.
Article
Multidisciplinary Sciences
Dongxin Liu, Satori Kowashi, Takayuki Nakamuro, Dominik Lungerich, Kaoru Yamanouchi, Koji Harano, Eiichi Nakamura
Summary: There is increasing attention to the chemical applications of transmission electron microscopy, but it is often hindered by radiation damage. This study focuses on the radiolysis damage in organic matter and aims to provide fundamental information on the product structure, electron energy influence, and reaction kinetics. By studying the [2 + 2] dimerization of a van der Waals dimer [60]fullerene in a carbon nanotube, the researchers identify five reaction pathways that serve as mechanistic models of radiolysis damage. The results highlight the importance of variable-temperature and variable-voltage kinetic analysis in understanding radiation damage mechanisms.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Hao-Chin Huang, Kai-Yuan Hsiao, Yu-Han Tseng, Yan-De Chen, Ming-Yen Lu
Summary: In this study, an in situ transmission electron microscopy (TEM) heating system was used to investigate the morphological changes of cubic Ag nanoparticles (NPs) and Ag-based core-shell structures induced by sublimation, as well as the influence of shell coverage on thermal stability. It was found that large Ag NPs (>50 nm) showed a three-stage sublimation-induced morphological change, while small Ag NPs (<30 nm) showed a uniform sublimation. The sublimation process of core-shell NPs started at stage II, and the thermal stability was enhanced by carbon shell passivation.
Article
Chemistry, Multidisciplinary
Shuang Zhang, Xue Tian, Ying Zheng, Yongcheng Zhang, Wanneng Ye
Summary: In this study, the evolution behavior and growth mechanism of PbO nanoparticles in a Sm-doped PMN-PT matrix were observed using transmission electron microscopy. It was found that PbO nanodroplets first separated from the matrix, then coalesced into solid phase PbO nanoparticles, and finally formed heterojunctions with the matrix. This research provides a deep understanding of the role of excess PbO in the synthesis of lead-based piezoelectric materials.
Article
Chemistry, Physical
A. S. Grenadyorov, A. A. Solovyev, E. V. Yakovlev, I. A. Glukhov, V. O. Semin, N. A. Popova, A. V. Solovyov
Summary: This paper focuses on the creation of a Ti-based surface alloy on AISI 316L austenite steel specimens through Ti film deposition using magnetron sputtering and low-energy high-current electron beam irradiation. The surface alloy consists of several sublayers with different structures and phase compositions. The formation of the Ti-based surface alloy increases the polar component of the free surface energy from 3.2% to 34.5% on the AISI 316L austenite steel surface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Zheng Liu, Hitomi Nakamura, Tomoko Akai
Summary: This paper presents an in situ TEM/STEM investigation on the transformation process of YAG:Ce phosphors, revealing the dissolution of nanocrystalline CeO2 particles and formation of YAlO3 and YAG:Ce crystalline particles at different temperatures. The study also confirms that doped Ce atoms occupy the same atomic sites as Y atoms, and the obtained YAG:Ce phosphor exhibits efficient luminescent properties.
Review
Chemistry, Multidisciplinary
Peter Tieu, Xingxu Yan, Mingjie Xu, Phillip Christopher, Xiaoqing Pan
Summary: The development of single atom catalysts (SACs) with carefully controlled properties has been driven by the need for atom efficient catalysts. Advances in transmission electron microscopy (TEM) techniques, including aberration correction, spectroscopy, and in situ/operando observation, have enabled researchers to study SACs at an atomic scale, providing crucial information about their location, characteristics, and stability.
Article
Chemistry, Analytical
Li-Ling Hung
Summary: Wireless sensor networks (WSNs) have wide applicability in daily life services, but limited energy is a critical issue. Recent studies have focused on wireless rechargeable sensor networks, where static rechargeable sensors or mobile chargers are used to replenish energy. However, for partially rechargeable environments, improving recharge efficiency and extending the lifetime of WSNs pose considerable challenges. In this paper, a flexible charging protocol is proposed that allows energy transmission from certain supply regions to other regions in a mobile sensor network (MSN). Evaluation results show that the proposed protocol is more efficient than other charging protocols in several situations.
Article
Chemistry, Physical
Zonglin Li, Mingxin Xie, Guozheng Nie, Junhui Wang, Lujun Huang
Summary: In this study, we developed an optical biosensor based on an all-dielectric metasurface with broken symmetry. The biosensor exhibited excellent performance, thanks to the high-Q quasi-bound states in the continuum (qBICs) and the efficient field confinement. It has potential applications in extreme biochemical sensing, such as COVID-19 detection at ultralow concentrations.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Geochemistry & Geophysics
A. K. Fedorenko, E. I. Kryuchkov, O. K. Cheremnykh, Yu. O. Klymenko, Yu. M. Yampolski
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
(2018)
Article
Physics, Condensed Matter
Yu. O. Klymenko, O. Shevtsov
EUROPEAN PHYSICAL JOURNAL B
(2009)
Article
Physics, Condensed Matter
Yu. O. Klymenko, O. Shevtsov
EUROPEAN PHYSICAL JOURNAL B
(2009)
Article
Physics, Applied
Yu. O. Klymenko
LOW TEMPERATURE PHYSICS
(2011)
Article
Physics, Condensed Matter
Yuriy Klymenko, Lyuba Malysheva, Alexander Onipko
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2008)
Article
Geochemistry & Geophysics
A. K. Fedorenko, E. I. Kryuchkov, O. K. Cheremnykh, A. D. Voitsekhovska, Yu. G. Rapoport, Yu. O. Klymenko
Summary: A simple method using VLF radio signal amplitudes for determining AGW characteristics in the lower ionosphere has been proposed and verified. AGW properties, including neutral density fluctuation and vertical displacement of atmospheric gas, were successfully estimated for relatively short radio paths. The results are consistent with AGW theory in the Earth atmosphere.
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
(2021)
Article
Astronomy & Astrophysics
Yu. O. Klymenko, A. K. Fedorenko, E. I. Kryuchkov, O. K. Cheremnykh, A. D. Voitsekhovska, Yu. O. Selivanov, I. T. Zhuk
Summary: A method for identifying acoustic-gravity waves (AGWs) in the atmosphere based on satellite measurement data has been proposed. By analyzing the polarization relations between wave parameters and using phase shifts, different wave types and vertical motion directions can be determined. Additionally, the spectral characteristics of the waves can be identified based on phase shifts between velocity fluctuations and thermodynamic parameters. Verification of the method showed that AGWs in the thermosphere align with the gravitational branch of acoustic-gravity waves, and evanescent waves were not observed in the satellite orbits considered.
KINEMATICS AND PHYSICS OF CELESTIAL BODIES
(2021)
Proceedings Paper
Nanoscience & Nanotechnology
L. Dekhtyaruk, A. P. Kharchenko, Yu O. Klymenko, Yu O. Shkurdoda, Yu M. Shabelnyk, O. Bezdidko, A. M. Chornous
PROCEEDINGS OF THE 2020 IEEE 10TH INTERNATIONAL CONFERENCE ON NANOMATERIALS: APPLICATIONS & PROPERTIES (NAP-2020)
(2020)
Article
Physics, Multidisciplinary
YO Klymenko, OK Cheremnykh, I Kremenetsky
Article
Chemistry, Physical
L Malysheva, Y Klymenko, A Onipko, R Valiokas, B Liedberg
CHEMICAL PHYSICS LETTERS
(2003)
Article
Physics, Applied
YO Klymenko
LOW TEMPERATURE PHYSICS
(2002)
Article
Materials Science, Multidisciplinary
A Onipko, Y Klymenko, L Malysheva
Article
Materials Science, Multidisciplinary
AI Onipko, KF Berggren, YO Klymenko, LI Malysheva, JJWM Rosink, LJ Geerligs, E van der Drift, S Radelaar
