Article
Physics, Multidisciplinary
Saqib Shahzad, Khurram Iqbal, Zaheer Uddin
Summary: Cobalt-silicon based carbon composites have gained attention as alternatives to conventional materials in the automotive and aerospace industries. A reactive melt infiltration process is used to achieve high reinforcement volume fraction and controlled shaping, with a mathematical model analyzing the infiltration dynamics using reaction-formed Co-Si alloy/C composite.
Article
Materials Science, Multidisciplinary
A. A. Serdobintsev, V. V. Galushka, L. D. Volkovoynova, I. O. Kozhevnikov, E. S. Prikhozhdenko, D. I. Artyukhov, N. V. Gorshkov, A. M. Pavlov, A. V. Starodubov
Summary: This study reports on the effects of aluminum and silicon segregation in mu m-thick magnetron co-deposited Si-Al films. It was found that an increase in aluminum content leads to the segregation of a separate crystalline phase, accompanied by the emergence of the c-Si phase. Silicon crystallization process is controlled by the redistribution of components in the film, which can be attributed to aluminum-induced crystallization process. The redistribution of aluminum and silicon phases in the amorphous matrix can be utilized to customize the electrophysical properties of the resulting coatings for applications in mm-band RF devices.
Article
Chemistry, Multidisciplinary
Rex C. Handford, Trisha T. Nguyen, Simon J. Teat, R. David Britt, T. Don Tilley
Summary: The synthesis of bimetallic molecular silicide complexes through Si-H bond activations in SiH4 at metal centers has been reported. Different Co complexes led to different reactions with SiH4, resulting in the formation of silicide complexes as products. The [BP2tBuPz] ligand has a significant effect on the Co-Si bonding and can facilitate the functionalization of the mu-silicon atom in a molecular silicide.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Applied
M. Pinzon, A. Romero, A. de Lucas-Consuegra, A. R. de la Osa, P. Sanchez
Summary: Cobalt catalysts supported using β-SiC are efficient for low-temperature hydrogen production from ammonia decomposition. The addition of small amounts of potassium metal significantly enhances catalytic activity, while excess potassium leads to blockage of active sites and decreased hydrogen production.
Article
Materials Science, Multidisciplinary
Jonathan Apell, Robert Wonneberger, Hartmut Stoeckerc, Pauline Meye, Katharina Freiberg, Martin Seyring, Stephanie Lippmann, Andreas Undisz
Summary: The effect of Co vs. Fe content on early stages of oxidation in air was studied in Co-Cr-Fe-Mn-Ni-Si complex concentrated alloys (CCAs). A higher Co content decreased the phase fraction of protective corundum-type oxide and hindered the formation of Cr-rich corundum-type oxide.
Article
Biochemistry & Molecular Biology
Changjian Zhou, Rong Sun, Yuting Zhang, Biao Xiong, Hui Dai, Yong Dai
Summary: A stable, earth-abundant, reusable cobalt-based heterogeneous catalyst has been developed for the oxidative esterification of alcohols, showing good to excellent product yields with broad substrate scope. The catalyst can be easily recycled up to five times without significant loss of efficiency, with the active sites proposed to be Co-N species.
Article
Chemistry, Multidisciplinary
Yeyoung Ha, Maxwell C. Schulze, Sarah Frisco, Stephen E. Trask, Glenn Teeter, Nathan R. Neale, Gabriel M. Veith, Christopher S. Johnson
Summary: In this study, lithium oxide was added to a cathode to compensate for initial lithium loss at the anode, and Co3O4 was introduced to activate the lithium oxide. The additives successfully increased the capacity of the cells using Si anodes.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Dongke Li, Jiaming Chen, Teng Sun, Yangyi Zhang, Jun Xu, Wei Li, Kunji Chen
Summary: Phosphorus/boron co-doping in Si quantum dots/SiO2 multilayers enhances subband light emission, with increasing B co-doping ratio resulting in improved emission intensity nearly two orders of magnitude stronger than solely P-doped samples. This enhancement is attributed to B dopants passivating surface dangling bonds, leading to suppressed phosphorus-related deep level emission and appearance of emission centered around 1400 nm in high B co-doping ratios.
Article
Chemistry, Physical
Niko Heikkinen, Laura Keskivali, Patrik Eskelinen, Matti Reinikainen, Matti Putkonen
Summary: ALD was used to prepare a thin alumina layer on Fischer-Tropsch catalysts, leading to increased activity without significant loss of selectivity. The stabilization of cobalt particles and nanoscale porosity of the overcoating were key factors in enhancing activity. Thermal annealing was essential in preparing the ALD overcoated catalyst.
Article
Materials Science, Multidisciplinary
Ronja Anton, Steffen Huning, Nadine Laska, Matthias Weber, Steven Schellert, Bronislava Gorr, Hans-Jurgen Christ, Uwe Schulz
Summary: In order to improve the oxidation resistance of Mo-Si-B alloys at high temperatures, a dual layer system was designed with a graded Mo-Si interlayer and a Si oxidation protective top layer to enhance adhesion. Long-term isothermal oxidation tests were conducted to study the chemical reactions and evolution of thermally grown SiO2 between the layers and substrate.
Article
Materials Science, Multidisciplinary
Junhee Lee, Honghyuk Kim, Lakshay Gautam, Manijeh Razeghi
Summary: A highly conductive gallium oxide doped with silicon and indium was grown on a c-plane sapphire substrate using MOCVD. The material exhibited high electron hall mobility and carrier concentration when doped with silicon, but was highly resistive without silicon doping. Indium was found to play a role in passivating electron trapping defect levels in the material.
Article
Materials Science, Ceramics
Giovanni Bianchi, Antonio Di Mauro, Luca Ferrari, Sandro Gianella, Alberto Ortona
Summary: This study investigates the production and oxidation behavior of SiC coated Si-SiC tetrakaidekahedron periodic structures at 1500 degrees C. C-SiC lattices were fabricated using 3D printing of polymer templates followed by replica technique and pyrolysis. Submicron SiC particles were successfully deposited onto the C-SiC structures through electrophoretic deposition (EPD) by optimizing voltage, frequency, and duty cycle. Different coating thicknesses were achieved by varying the deposition time. The coated samples were then infiltrated with molten silicon, oxidized at 1500 degrees C, and characterized.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Yuanyuan Han, Haoyu Fu, Guihuan Chen, Xiaoshan Wang, Yue Zhao, Xiang Sui, Zhiqiang Zhao, Xiancheng Sang, Qinghao Li, Qiang Li
Summary: A Si/Si-Co multilayer film was successfully fabricated by alternating magnetron sputtering, achieving both metal doping and surface coating. The film improved the stability and electron conduction of the Si anode, leading to high initial coulombic efficiency and capacity retention.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Michael Oehme, Mathias Kaschel, Steffen Epple, Maurice Wanitzek, Zili Yu, Daniel Schwarz, Ann-Christin Kollner, Joachim N. Burghartz, Jorg Schulze
Summary: This paper presents a near-infrared Ge-on-Si camera with backside illumination, showcasing high fill-factor and linear photocurrent characteristics. By operating the Ge-on-Si detectors under zero bias, dark current is minimized and high signal-to-noise ratio and optical responsivity are achieved.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Huan Ruan, Lifeng Zhang, Shuai Li, Kai Wang, Wenhuan Huang, Shouwu Guo
Summary: This study investigates Si-based anode materials for lithium-ion batteries, and presents a Si/CoMo@NCP anode material that addresses the issues of low conductivity and volume expansion of Si. The Si/CoMo@NCP anode exhibits high capacity, stability, and rate performance, attributed to the encapsulation of NCP, doped nitrogen, and metallic cobalt.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
