Article
Multidisciplinary Sciences
Yue-Hui Li, Rui-Shi Qi, Ruo-Chen Shi, Jian-Nan Hu, Zhe-Tong Liu, Yuan-Wei Sun, Ming-Qiang Li, Ning Li, Can-Li Song, Lai Wang, Zhi-Biao Hao, Yi Luo, Qi-Kun Xue, Xu-Cun Ma, Peng Gao
Summary: This study investigates the interface thermal conductance of nitride-based high-power devices using atomically resolved vibrational electron energy-loss spectroscopy, and observes different interface phonon modes and their contributions to thermal conductance.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
Shin Horiuchi, Yida Liu, Takeshi Hanada, Haruhisa Akiyama
Summary: A simple steam treatment can enhance the bonding strength between aluminum substrate and epoxy adhesives by inducing diffusion of adhesive molecules into nanopores of the aluminum surface and forming weak acid-base interactions.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Yida Liu, Yuri Shigemoto, Takeshi Hanada, Takayuki Miyamae, Kazunori Kawasaki, Shin Horiuchi
Summary: Blending a small amount of maleic anhydride-grafted PP (PPgMA) with isotactic polypropylene (iPP) significantly improves the adhesive strength in direct melt bonding to aluminum. However, the effectiveness of PPgMA is limited and peaks at around 20 wt% PPgMA. The formation of a low-molecular-weight layer with low crystallinity at the interfacial region appears to be responsible for the enhanced adhesion strength.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Multidisciplinary Sciences
Wenjian Chen, Hippolyte Hirwa, Joerg Ohland, Teoman Taskesen, Ulf Mikolajczak, Devendra Pareek, Juergen Parisi, Levent Guetay
Summary: By depositing thin diffusion barrier layers of silicon oxynitride (SiOxNy) on Mo layers before growing CZTSe absorbers, the thicknesses of MoSe2 layers can be controlled, resulting in a reduction in thickness. CZTSe solar cells grown on Mo/SiOxNy back contacts exhibit deteriorated energy conversion efficiency as the SiOxNy layers become thicker, while those grown on Mo/SiOxNy/Mo back contacts maintain efficiencies at around 11% with thin 10 nm SiOxNy layers.
Article
Chemistry, Physical
Yi-Che Chen, Yu-Cheng Chang, Alexandre Gloter, Pei-Kai Hsu, Jenn-Ming Song, Shih-Yun Chen
Summary: The photocatalytic performance of new TiO2/CeO2 composites was enhanced compared to bare TiO2 and CeO2 nanoparticles. Tuning the TiO2 shell deposition extended the absorption range to visible light and prolonged the lifetime of photo-induced electron-hole pairs, resulting in a significant enhancement in the degradation rate of methylene blue under both UV and visible light conditions. The strong interface interaction and modification of Ce3+ and Ti3+ content near the interface in the core-shell structure contribute to the improved photocatalytic efficiency.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Piu Rajak, Regina Ciancio, Antonio Caretta, Simone Laterza, Richa Bhardwaj, Matteo Jugovac, Marco Malvestuto, Paolo Moras, Roberto Flammini
Summary: We conducted a study on the sub-nanometer interlayer of crystalline silicon nitride at the Ni/Si interface, examining its role as a barrier against atom diffusion using transmission electron microscopy measurements and energy dispersive X-ray analysis. The results revealed that discontinuous silicide areas can be formed just below the nitride layer, with composition matching that of the nickel disilicide. This reaction between nickel and silicon is believed to be caused by thermal strain experienced by the interface during the deposition of nickel at low temperature.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Chao Yang, Roberto A. Ortiz, Yi Wang, Wilfried Sigle, Hongguang Wang, Eva Benckiser, Bernhard Keimer, Peter A. van Aken
Summary: The polarity of the interface plays a crucial role in the physical properties of oxide heterointerfaces, as it can lead to specific modifications of the electronic and atomic structure. The recently discovered superconducting nickelate films in the NdNiO2/SrTiO3 interface may have important reconstruction effects, as bulk superconductivity has not been observed. Through four-dimensional scanning transmission electron microscopy and electron energy-loss spectroscopy, the effects of oxygen distribution, polyhedral distortion, elemental intermixing, and dimensionality in NdNiO2/SrTiO3 superlattices on SrTiO3 (001) substrates were studied. The results provide insights into the understanding of reconstructions at NdNiO2/SrTiO3 polar interfaces.
Article
Physics, Applied
Takanori Asano, Manabu Tezura, Masumi Saitoh, Hiroki Tanaka, Jun Kikkawa, Koji Kimoto
Summary: We observed the nanoscale distribution of subgap excitations induced by Ga-ion beam processing in beta-Si3N4 using electron energy-loss spectroscopy. By combining crystallinity, composition, and bandgap measurements, we found that defects excited at different energy levels exhibit different dependence trends with respect to crystallinity. This proposed technique can effectively distinguish between various amorphous materials.
APPLIED PHYSICS EXPRESS
(2022)
Article
Chemistry, Physical
Amalia Navarro, Elisa Garcia-Tabares, Quentin M. Ramasse, Pablo Cano, Ignacio Rey-Stolle, Beatriz Galiana
Summary: Integration of GaP layers on silicon substrates using AsH3 pre-exposure followed by a PH3-based GaP epitaxial growth allows the development of very promising processes for the photovoltaic industry. However, many of the growth routines using this approach suffer from reproducibility issues, leading to poor quality layers. This lack of knowledge on the mechanisms behind the formation of common planar defects and their dynamics hinders the successful transfer of the method to new epitaxial systems.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
C. H. Ortiz, S. S. Sanchez, J. C. Caicedo, H. D. Colorado, W. Aperador
Summary: This study investigates the corrosive wear behavior of (Si3N4 and Al2O3) individual layers and the [Si3N4/Al2O3]n heterostructure as a function of the bilayers number. The research provides a comprehensive analysis of the structural, chemical, and surface properties that influence the corrosion response of these coatings. The results indicate that the heterostructure exhibits superior properties compared to the individual coatings, and the properties improve as the bilayers number increases. The [Si3N4/Al2O3] heterostructure formed by 70 bilayers demonstrates the best combination of properties for highly corrosive environments.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Bernat Mundet, Claribel Dominguez, Jennifer Fowlie, Marta Gibert, Jean-Marc Triscone, Duncan T. L. Alexander
Summary: In this study, nanoscale mapping of the distinct electronic phases characterizing the metal-insulator transition displayed by rare-earth nickelate compounds was achieved using scanning transmission electron microscopy in combination with electron energy-loss spectroscopy. The evolution of fine structures at O K and Ni L edges across different NdNiO3/SmNiO3 superlattices was tracked, revealing electronic states and spatial configurations of metallic/insulating regions. The width of metallic/insulating boundaries at the NdNiO3/SmNiO3 interfaces was estimated to be approximately four unit cells.
Article
Chemistry, Multidisciplinary
Giovanni Borgh, Corrado Bongiorno, Salvatore Cosentino, Antonino La Magna, Salvatore Patane, Silvia Scalese, Antonio Terrasi, Giacomo Torrisi, Rosaria A. Puglisi
Summary: The study investigates the growth of AZO on silicon nanowires (SiNWs) and examines its morphological evolution. It is found that AZO initially forms crystalline nano-islands and later coalesces into a conformal polycrystalline shell on the substrate. The deposition process of AZO leads to the growth of a polycrystalline matrix between SiNWs, resulting in the formation of hook-shaped SiNWs covered by AZO.
Article
Materials Science, Multidisciplinary
Ke Ran, Fanlin Zeng, Liudmila Fischer, Stefan Baumann, Wilhelm A. Meulenberg, Kerstin Neuhaus, Joachim Mayer
Summary: This study characterized the newly formed phase inside dual-phase oxygen transport membranes (DP-OTMs) using advanced transmission electron microscopy techniques. The results showed that the newly formed phase is primarily surrounded by the existing phase, reducing non-solute segregation at grain boundaries. The study also observed the crystal structure of interfaces between the two phases.
Article
Engineering, Manufacturing
Meng Li, Hai-Lu Huang, Jia-Min Wu, Ya-Ru Wu, Zhang-Ao Shi, Jing-Xian Zhang, Yu-Sheng Shi
Summary: In this study, Si3N4 ceramics were successfully fabricated by DLP technology using Si3N4 powder coated with Al2O3-Y2O3 sintering additives. The research systematically studied the effects of the coating amount of sintering additives on the properties of the ceramics. The results provide an experimental basis for DLP forming Si3N4 and other non-oxide ceramics.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Ceramics
Zhengdao Liu, Zongwei Tong, Sheng Yue, Xiaolei Li, Huiming Ji
Summary: By designing and preparing a Si3N4/BAS coating with a heterogeneous-layer structure, the issue of stress cracks caused by sintering mismatch was effectively solved, improving the stability and performance of porous Si3N4 ceramics coatings.
CERAMICS INTERNATIONAL
(2021)
