Article
Chemistry, Physical
Patrick Philipp, Gregoire Defoort, Alan Bahm, Tom Wirtz
Summary: The study investigates the potential of ultra-low energy ion beam processes and highlights the importance of considering deposition of residual gas molecules in the instrument chamber. Ion-induced sputtering and deposition may compete depending on ion energy and irradiation density, with the quality of vacuum significantly impacting the process.
APPLIED SURFACE SCIENCE
(2023)
Article
Physics, Condensed Matter
J. Seo, D. A. Pearson, R. M. Bradley, J-S Kim
Summary: The nanoscale patterns produced by bombardment of the (100) surface of silicon with a 2 keV Kr ion beam are investigated both experimentally and theoretically. The experimental results show that the observed patterns depend sensitively on the angle of incidence Theta, and five distinct morphologies are observed for Theta values between 74 degrees and 85 degrees. Simulation results indicate that the inclusion of a linearly dispersive term and a conserved Kuramoto-Sivashinsky nonlinearity can reproduce the triangular nanostructures observed in experiments, while the Harrison-Pearson-Bradley equation can generate ridges traversed by ripples. The simulations of the anisotropic Edwards-Wilkinson equation match the experimental results for Theta = 85 degrees. However, explanation for the other two patterns observed in experiments remains a challenge for future theoretical work.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Engineering, Electrical & Electronic
G. Pfusterschmied, F. Triendl, M. Schneider, U. Schmid
Summary: This paper investigates the impact of plasma power and plasma exposure time on the characteristics of silicon carbide Schottky diodes. The results show that optimizing plasma power can effectively tune the SBH of the diodes. Ion bombardment can increase the SBH, but similar results can be achieved by optimizing the plasma power. Additionally, using ion bombardment can improve the homogeneity of SBH on wafer level.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Automation & Control Systems
Paulo M. B. Esteves, Moritz Wiessner, Joao V. M. R. Costa, Maria Sikora, Konrad Wegener
Summary: Through single discharge experiments and ellipsoidal equation analysis, the dimensions and aspect ratio of craters in wire electrical discharge machining can be obtained, indicating that the shape of the craters is influenced by the energy level and has a preferential growth direction along the wire length.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Physical
X. G. Song, W. L. Zhou, S. P. Hu, D. Y. Lin, W. Fu, Y. Y. Song, W. M. Long
Summary: This study investigates in detail the microstructure and properties of the 1060Al surface after bombardment with different doses of Ar ion, as well as the evolution rule of the quality of subsequent solid-state diffusion bonded joints. The results show that at an appropriate ion bombardment dose (2 x 1018ion/cm), the oxide layer can be completely removed, the surface roughness is reduced, and crystal defects beneficial for diffusion bonding are formed near the surface. Well-bonded joints with high bonding ratio and shear strength can be obtained even at lower process parameters.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Ziying He, Zhexi Xiao, Hongjie Yue, Yaxin Jiang, Mingyu Zhao, Yukang Zhu, Chunhui Yu, Zhenxing Zhu, Feng Lu, Hairong Jiang, Chenxi Zhang, Fei Wei
Summary: Silicon-based anodes with single-walled carbon nanotubes (SWCNTs) network exhibit higher initial discharge capacity, higher initial Coulombic efficiency, exceptional cyclic stability, and higher lithium-ion diffusion coefficient compared to those with multiwalled carbon nanotubes (MWCNTs) network. The underlying mechanism behind this difference is elucidated through in situ Raman spectroscopy and theoretical analysis. It is determined that the more flexible SWCNTs and their stronger van der Waals forces enable better contact between SiOx@C and SWCNTs under large stress during cycling.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Grzegorz Gawlik, Pawel Ciepielewski, Ewa Dumiszewska, Anna Piatkowska, Pawel Dabrowski, Jacek M. Baranowski
Summary: This study investigates the mechanism of CVD graphene adhesion to a SiO2 substrate under 100 keV He+ ion bombardment. It is found that the process not only creates defects in the graphene lattice, but also induces dangling bonds in the glass substrate, leading to a strong increase in the adhesion of graphene to the substrate. The results show that the formation of covalent bonds between graphene and the substrate is responsible for this increased adhesion. Surface Enhanced Raman Spectroscopy (SERS) measurements confirm the formation of covalent C-O bonds, indicated by the presence of a carbonate CO3 complex line at 1078 cm(-1). Furthermore, there is a significant enhancement in the scratch resistance of ion implanted graphene on the SiO2 substrate when there is overlapping of defect areas.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Lionel Simonot, Florian Chabanais, Sophie Rousselet, Frederic Pailloux, Sophie Camelio, David Babonneau
Summary: Metal nanostructures on a dielectric substrate exhibit unique plasmonic properties dependent on their morphologies. Modifications induced by ultra-low-energy ion-beam bombardment near sputtering threshold allow for controlled changes to the structures and optical properties. The preferential sputtering of smaller particles and erosion of larger ones can tune the plasmonic dichroism of self-organized assemblies, leading to the formation of isolated tiny particles with desired properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Coatings & Films
Joseph R. R. Vella, David B. B. Graves
Summary: Classical molecular dynamics simulations were used to simulate silicon-chlorine-argon (Si-Cl 2-Ar) atomic layer etching (ALE). The simulations provided a detailed understanding of the near-surface region during ALE processing. The presence of Ar+ ions resulted in a mixed amorphous region and deviated from the ideal ALE picture. The Si etch yield and etch product distribution showed significant changes depending on the Ar+ ion fluence. Atomic Cl and silicon chlorides were the major etch products initially, but decayed quickly. The yield of atomic Si remained relatively constant with varying Ar+ ion fluence. A new schematic of Si-Cl 2-Ar ALE was presented to highlight the complex behavior observed in the MD simulations.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Astronomy & Astrophysics
A. P. Crosta, E. A. Silber, R. M. C. Lopes, B. C. Johnson, E. Bjonnes, M. J. Malaska, S. D. Vance, C. Sotin, A. Solomonidou, J. M. Soderblom
Summary: Titan is a unique world in the solar system, with its combination of ocean, ice, and organic features. The potential for biosignatures on its surface, in impact melt deposits, and in cryovolcanic flows makes it a prime target for astrobiological research. Impact craters play a crucial role in facilitating the exchange of materials between Titan's surface and subsurface water ocean.
Article
Geochemistry & Geophysics
Yiran Wang, Bo Wu, Haiou Xue, Xiaoming Li, Jun Ma
Summary: This study introduces a machine-learning approach for automatic crater detection and a method for extracting 3D morphometric information of craters. These approaches were applied to create a global crater dataset containing approximately 1.32 million craters with diameters of 1 km or larger, which were verified against previously published catalogs. This comprehensive crater catalog provides valuable data for various lunar scientific studies.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Environmental Sciences
Caio Vidaurre Nassif Villaca, Alvaro Penteado Crosta, Carlos Henrique Grohmann
Summary: This study conducted a morphometric analysis of impact craters on Pluto using a digital elevation model, finding variations in crater depth and morphology across different terrains possibly due to the presence of volatile ices.
Article
Electrochemistry
R. A. Dressler, J. R. Dahn
Summary: SiOx is a silicon-based anode material for Li-ion batteries with adjustable oxygen content synthesized by roller milling under oxygen flow. A simple 4-step procedure using KOH solution, aluminized pouch bags, and gas quantification measurements is presented for quick and inexpensive oxygen content determination. This method serves as a substitute to traditional gas fusion analysis.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Engineering, Mechanical
Philip A. S. Gores, John G. Spray
Summary: In this study, the results of eleven unconfined hypervelocity experiments were reported, focusing on the impact of a 316 stainless steel projectile with an anorthosite rock target. The experiments showed that the mass loss of the anorthosite, as well as the shape and depth of the resulting craters, were influenced by the impact energy and velocity. The use of 3-D laser scanning and mathematical fits helped analyze and predict the crater shapes. The findings suggested that the shape of the craters generated by hypervelocity impact could be best described using the hyperbolic form.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Leh-Ping Chang, Jian-Jie Wang, Fan-Yi Ouyang
Summary: This study focuses on introducing high-density nanotwinned structure into Ag films with strong (111) surface orientation. Different substrate biases were applied during the deposition process to optimize the nanostructure and properties of the films. By increasing the applied substrate bias, the formation of undesirable transition region can be suppressed. The nanotwinned (111) Ag film with moderate substrate bias shows low resistivity and high hardness.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
