Article
Chemistry, Multidisciplinary
Sagnik Das, Uttam Kumar Ghorai, Rajib Dey, Chandan Kumar Ghosh, Mrinal Pal
Summary: This paper reports the successful tuning of defect-mediated blue phosphorescence of ZnO nanopowders by annealing at different temperatures, resulting in changes in intensity, shade, and color temperature. Multiple characterization techniques were used to examine the microstructural, compositional, and band-structure details, and optical properties of the samples were studied through PL and tau-PL spectroscopy.
Article
Materials Science, Multidisciplinary
Lionel Desgranges, Aurelien Canizares, Patrick Simon
Summary: This study measured the Raman spectrum of a He-implanted UO2 sample at different temperatures and identified two annealing steps corresponding to known annealing temperatures. The results are discussed to determine the possible defects responsible for the Raman defect peaks.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Chemistry, Physical
Xinyuan Dong, Diyuan Zheng, Jing Lu, Yiru Niu, Hui Wang
Summary: The study demonstrates selectively enhanced violet and near-infrared effects in ZnO/Si homo-heterostructure, with sensitivity controlled by manipulating annealing temperature. The increase in optical response time of the annealed sample by about 25 times is attributed to defect ionization in the ZnO layer and resistivity change after annealing.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Saptarshi Ghosh Dastider, Abhishek Ramachandra Panigrahi, Arup Banerjee, Krishna Kanta Haldar, Alessandro Fortunelli, Krishnakanta Mondal
Summary: In this study, density functional theory based methods are used to investigate the structure and stoichiometry of ZnO clusters in the ZnO/Cu/Al2O3 catalyst for methanol synthesis. It is found that the stability of ZnO clusters increases with water concentration, with a morphological transition from planar to 3D configurations. These clusters have weak interaction with CO(2) and water is predicted to block the active center. The Cu(111) surface plays an important role in enhancing CO2 adsorption on the ZnO/Cu(111) systems.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Masamichi Akazawa, Shunta Murai, Tetsu Kachi
Summary: The encapsulant-dependent effects of long-term low-temperature annealing on defects in Mg-ion-implanted GaN were investigated. Different cap layers led to different capacitance-voltage characteristics, suggesting the presence of interstitial Ga defects.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Physics, Applied
Xinghua Liu, Fang-Fang Ren, Zhengpeng Wang, Xinyu Sun, Qunsi Yang, Yiwang Wang, Jiandong Ye, Xiufang Chen, Wei-Zong Xu, Dong Zhou, Xiangang Xu, Rong Zhang, Hai Lu
Summary: By studying the optical emission spectra of defects, the thermally-driven defect dynamic reaction in ion implanted 4H-SiC has been investigated. The conversion from silicon vacancies (V-Si) to carbon antisite-vacancy pairs (C-Si-V-C) has been observed upon annealing, which provides guidance for defect engineering in SiC.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Qian Li, Heng Yuan, Mengdi Zhang, Weiqing Yan, Bin Liao, Xu Zhang, Minju Ying
Summary: The annealing effect on Er-implanted ZnO films under different conditions were systematically studied, showing that vacuum annealing significantly enhances the magnetization of the films and is correlated with an increase in oxygen vacancy concentration. The research provides clear evidence of the relationship between the enhancement of ferromagnetism and the increase of oxygen vacancies in Er-doped ZnO.
Article
Materials Science, Multidisciplinary
P. P. Liu, S. N. Jiang, Y. F. Du, Q. Zhan, H. F. Zhao, W. T. Han, X. O. Yi, S. Ohnuki, F. R. Wan
Summary: The research indicates that hydrogen atoms play a significant role in affecting the migration mechanism of point defects, contributing to the irradiation resistance of nuclear materials. The migration energies of vacancies and interstitials in vanadium were found to be approximately 1.5eV and 0.3eV respectively, based on experimental data. Additionally, the study also examines the surface effect on measuring migration energy and the interaction between hydrogen and point defects.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Electrical & Electronic
Jingmin Wu, Zhi He, Zhiyu Guo, Run Tian, Fengxuan Wang, Min Liu, Xiang Yang, Zhongchao Fan, Fuhua Yang
Summary: Pulsed laser annealing (PLA) was used to activate phosphorous-implanted C-face SiC and repair lattice damage, resulting in electrical activation and lattice defect recovery. The structural transformation from amorphous 4H-SiC to crystalline structure was observed through transmission electron microscopy (TEM) analysis. Defect evolution was further investigated using TEM images and diffraction patterns.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Emi Kano, Ritsuo Otsuki, Koki Kobayashi, Keita Kataoka, Kacper Sierakowski, Michal Bockowski, Masahiro Nagao, Tetsuo Narita, Tetsu Kachi, Nobuyuki Ikarashi
Summary: Transmission electron microscopy is used to observe dislocation loops in Mg-ion-implanted GaN during annealing. The diffusion of native defects is slowed down at higher pressure during annealing. Secondary ion mass spectrometry shows that annealing at higher pressure retards the migration of Mg and increases its concentration in the ion-implanted region. These findings provide a design principle for the annealing process to activate ion-implanted Mg in GaN.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Abdallah Reza, Guanze He, Cody A. Dennett, Hongbing Yu, Kenichiro Mizohata, Felix Hofmann
Summary: Tungsten is a promising candidate material for plasma-facing armour components in future fusion reactors. However, its normally excellent thermal transport properties can be degraded by irradiation. The study shows that thermal diffusivity in tungsten can recover between 450 K and 650 K, but remains reduced after annealing at higher doses. Thermal diffusivity provides an efficient tool for assessing total defect content in tungsten.
Article
Biochemistry & Molecular Biology
Nikolaos A. Papanikolaou, Marios Nikolaidis, Grigorios D. Amoutzias, Ariadni Fouza, Maria Papaioannou, Akhilesh Pandey, Athanasios G. Papavassiliou
Summary: This study reveals for the first time the global changes in arginine protein mono- or dimethylation in proliferating myoblasts and differentiated myocytes, identifying differentially methylated protein families, enriched protein domains, and novel short linear motifs. These findings may be crucial for understanding the links between differentiation and cancer growth.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Jiao Xu, Zixuan Shang, Zhipeng Hou, Xiaolei Wang
Summary: This study conducted a comparative investigation on the crucial roles of oxygen vacancies and interface roughness in non-volatile ZnO memristors, which is important for the development of neural networks based on non-volatile memory.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Santosh V. Mohite, Shinik Kim, Jiyoung Bae, Hee J. Jeong, Tae Woong Kim, Jihoon Choi, Yeonho Kim
Summary: This study focuses on the surface defects of ZnO nanoparticles and their interaction with plasmonic gold nanoparticles (NPs) for efficient H-2 production. It is found that the creation of surface oxygen vacancy (V-o) defects on ZnO NPs allows for the diffusion of single Au atoms and the formation of Au NPs through in situ photodeposition. The formation of a heterojunction between ZnO and plasmonic Au NPs leads to enhanced photoelectron lifetimes and donor charge density, resulting in significantly higher H-2 production rates compared to pristine V-o-ZnO. Additionally, the Au/Vo-Au:ZnO-4 heterojunction exhibits visible light activity by generating hot carries through induced surface plasmonic effects.
Article
Chemistry, Physical
Jan Zawala, Jonas Miguet, Preetika Rastogi, Omer Atasi, Mariusz Borkowski, Benoit Scheid, Gerald G. Fuller
Summary: This study provides the first quantitative proof of the influence of dynamic adsorption layers on the drainage dynamics of single foam films formed under dynamic conditions. By measuring the drainage dynamics of single foam films formed by air bubbles colliding against the interface between n-octanol solutions and air, it was found that the morphology of the single film during drainage is closely related to the state of the dynamic adsorption layer during the rising and bouncing steps of the bubble. It is demonstrated that the lifetime of surface bubbles is intimately related to the history of their formation.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Mechanical
M. Nowak, K. Mulewska, A. Azarov, L. Kurpaska, A. Ustrzycka
Summary: This study presents a novel peridynamic constitutive relations for predicting plastic deformation and damage evolution in irradiated materials. The plastic behavior of the material, where radiation induced defects contribute to peridynamic porosity, is described by the Gurson-Tvergaard-Needleman (GTN) yield criterion with irradiation hardening. The physical relevance of coupling the porosity with the nonlinear irradiation hardening is discussed, and the expressions for the yield function, kinetics of porosity evolution, irradiation hardening, and plastic flow rule are derived.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Physical
A. Mackova, A. Jagerova, O. Lalik, R. Miksova, D. Poustka, J. Mistrik, V Holy, J. D. Schutter, U. Kentsch, P. Marvan, A. Azarov, A. Galeckas
Summary: ZnO nanopillars were implanted with Au-400 keV and Ag-252 keV ions at different fluences. The presence of Ag and Au in the ZnO nanopillar layers was confirmed by Rutherford Back-Scattering spectrometry (RBS), which matched well with theoretical calculations. Ion implantation resulted in a reduction in the thickness of the ZnO nanopillar layer. Spectroscopic Ellipsometry (SE) showed a decrease in refractive index in the nanopillar parts with embedded Au and Ag ions. XRD revealed a decrease in vertical domain size due to radiation damage from Au ions. Optical activity in the nanopillars was observed using SE and diffuse reflectance spectroscopy (DRS) in the presence of Au and Ag nanoparticles. PL features linked to ZnO deep level emission were enhanced due to plasmonic interaction with metal nanoparticles created by Ag and Au implantation. Photocatalytic activity was more influenced by the nanoparticles in the layer rather than surface morphology. Dual implantation with Ag and Au ions resulted in enhanced optical activity without significant morphology deterioration compared to solely Au-ion implanted nanopillars.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Tianxiang Lin, Si-Hua Li, Lok-Ping Ho, Andrej Kuznetsov, Ho Nam Lee, Tony Chau, Francis Chi-Chung Ling
Summary: The fabrication of SiC junction barrier Schottky diodes involves Al ion implantation for p-type doping. By using a new fabrication method, it has been found that low temperature annealing followed by thermal oxidation can solve the trade-off between high Al acceptor activation and low residual concentration of carbon vacancies. This results in the suppression of carbon vacancies and a significant reduction in the reverse leakage current.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Instruments & Instrumentation
T. A. O. Jafer, T. T. Thabethe, O. S. Odutemowo, S. A. Adeojo, H. A. A. Abdelbagi, J. B. Malherbe
Summary: Glassy carbon samples were implanted with ruthenium ions and investigated using XRD, Raman spectroscopy, AFM, and SIMS to study the microstructural changes and diffusion behavior of ruthenium. The results showed that ion implantation caused amorphization and increased tensile stress in the implanted region. Annealing led to recrystallization and a change from tensile to compressive stress. SIMS results indicated the aggregation and segregation of ruthenium atoms at different temperatures, which affected the surface roughness observed by AFM.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Physics, Applied
Alexander Azarov, Ji-Hyeon Park, Dae-Woo Jeon, Andrej Kuznetsov
Summary: The migration properties of intrinsic defects in alpha-Ga2O3 were investigated by introducing lattice disorder through ion irradiation and monitoring its evolution with respect to ion dose, flux, and temperature. The results showed a significantly high mobility of intrinsic defects in alpha-Ga2O3, as evidenced by the presence of two distinct disordered regions near the surface and in the bulk, instead of the expected Gaussian shape. Furthermore, the accumulation of disorder was found to be highly sensitive to ion flux and temperature, indicating a dose-rate effect.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
A. Y. Polyakov, A. I. Kochkova, A. Azarov, V. Venkatachalapathy, A. V. Miakonkikh, A. A. Vasilev, A. V. Chernykh, I. V. Shchemerov, A. A. Romanov, A. Kuznetsov, S. J. Pearton
Summary: Ion beam fabrication of metastable polymorphs of Ga2O3, assisted by the controllable accumulation of the disorder in the lattice, is explored for its alternative approach to conventional deposition techniques. In this study, two strategies - ion implantation of silicon donors and plasma treatment with hydrogen - are investigated for tuning the electron concentration in the ion beam created metastable kappa-polymorph. The results show that silicon doping did not change the high resistive state, while hydrogen plasma treatment converted the ion beam fabricated kappa-polymorph to n-type conductivity.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
A. Y. Polyakov, A. Kuznetsov, A. Azarov, A. V. Miakonkikh, A. V. Chernykh, A. A. Vasilev, I. V. Shchemerov, A. I. Kochkova, N. R. Matros, S. J. Pearton
Summary: Defects in lightly Sn-doped (2 x 10(16) cm(-3)) (010)-oriented bulk beta-Ga2O3 before and after Au ion implantation and hydrogen plasma treatment were studied. Au implantation introduced defects that depleted carriers and created electron traps and deep acceptors with energy levels similar to deep traps in beta-Ga2O3. Hydrogen plasma treatment enhanced the photocurrent and photo-capacitance and reduced the width of the insulating layer. The results can be explained by hydrogen passivation of Ga vacancies, which returned the region to n-type conductivity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Coatings & Films
Alexander Azarov, Vishnukanthan Venkatachalapathy, In-Hwan Lee, Andrej Kuznetsov
Summary: Gallium oxide (Ga2O3) shows complex behavior under ion irradiation, with both functional properties and polymorphic transformations affected by ion-induced disorder. Minimizing lattice disorder can be achieved through postirradiation anneals or through implants at elevated temperatures to prevent disorder accumulation. In this study, both approaches were used to minimize radiation disorder in monoclinic beta-Ga2O3, with implants at 300℃ effectively suppressing defect formation while postirradiation anneals above 900℃ were necessary to achieve similar crystalline quality in samples implanted at room temperature.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Editorial Material
Materials Science, Multidisciplinary
Andrej Kuznetsov, Wisanu Pecharapa
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
E. Wyszkowska, C. Mieszczynski, L. Kurpaska, A. Azarov, W. Chrominski, I Jozwik, A. Esfandiarpour, A. Kosinska, D. Kalita, R. Diduszko, J. Jagielski, S. T. Nori, M. Alava
Summary: The radiation resistance of NixFe1-x single crystals was studied by irradiating them with Ni-58 ions and analyzing the resulting damage. It was found that the addition of iron reduced the formation of damage and increased the hardness of the alloy. Simulations showed that the presence of FeNi3 (L1(2)) phase contributed to the high hardness of the Ni0.62Fe0.38 alloy.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Instruments & Instrumentation
Cyprian Mieszczynski, Przemyslaw Jozwik, Kazimierz Skrobas, Kamila Stefanska-Skrobas, Renata Ratajczak, Jacek Jagielski, Frederico Garrido, Edyta Wyszkowska, Alexander Azarov, Katharina Lorenz, Eduardo Alves
Summary: In this work, the unique capability of the new version of the McChasy code (called McChasy2) to simulate experimental energy spectra delivered by Rutherford Backscattering Spectrometry in channeling direction (RBS/C) using large atomic structures (ca. 108 atoms) is presented. The focus is on the simulations of extended structural defects (edge dislocations and loops) formed inside nickel-based single-crystal alloys, which are widely studied and promising materials for high-temperature applications.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Multidisciplinary Sciences
Rui Zhu, Huili Liang, Shangfeng Liu, Ye Yuan, Xinqiang Wang, Francis Chi-Chung Ling, Andrej Kuznetsov, Guangyu Zhang, Zengxia Mei
Summary: In this study, a new optoelectronic memory based on a photosensitive dielectric (PSD) architecture was proposed. Data writing and erasing were achieved by optical pulse, reducing the programming voltage and optical power density. This discovery provides a brand new direction for low energy consumption non-volatile optoelectronic memories.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Samriti, Marina Rumyantseva, Shuhui Sun, Andrej Kuznetsov, Jai Prakash
Summary: This paper discusses the research on the detection and removal of air pollutants using novel multifunctional nanomaterials. These emerging nano materials have high stability, sensitivity down to parts per-billion level, and excellent removal efficiency for air pollutants. The focus is on their specific strategies and recent highlights in environmental and health monitoring. The challenges and future prospects are also discussed.
CURRENT OPINION IN ENVIRONMENTAL SCIENCE & HEALTH
(2023)
Article
Chemistry, Multidisciplinary
E. Wyszkowska, C. Mieszczynski, L. Kurpaska, A. Azarov, I. Jozwik, A. Kosinska, W. Chrominski, R. Diduszko, W. Y. Huo, I. Cieslik, J. Jagielski
Summary: Radiation-induced heterogeneous damage is the main cause of failures in nuclear power reactors, but single crystal materials without grain boundaries show promise in overcoming this issue. By fine-tuning the composition, heterogeneous damage in NixFe1-x single crystal alloys can be further overcome.