Article
Chemistry, Analytical
Shixiang Ma, Yachao Liu, Hongwu Tian, Lianbo Guo, Daming Dong
Summary: Laser-induced breakdown spectroscopy (LIBS) is widely used as a micro-damage detection technique, but it often leads to sample destruction due to high-energy ablation. Resonant LIBS (RLIBS) is an improved LIBS method that allows minimally destructive elemental analysis. This study investigates four different excitation modes of RLIBS using lead (Pb), indium (In), and silicon (Si) as examples. The results show that RLIBS with ground-state atom excitation (RLIBS-G) achieves better spectral intensity and higher detection sensitivity and accuracy for trace element analysis in copper alloys.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Chemistry, Physical
Hanqing Dong, Hongwei Xie, Yanan Xu, Qiushi Song, Zhiqiang Ning, Huayi Yin
Summary: In this study, B-doped silicon flakes with high-rate performance were fabricated as anode materials for lithium-ion batteries. The layered structure of the material shortens the diffusion pathways of lithium ions, and the B doping and layered structure contribute to increased conductivity and lattice expansion. The B-doped silicon flakes electrode exhibits high specific capacity and good cycling stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Miaomiao Cao, Wanbao Wu, Ruitian Guo, Yihong Liang, Guangxing Pan, Hao Wu, Xiangli Liu, Jiaheng Zhang
Summary: Carbon-encapsulated NiCo-NiCo2O4 nanoparticles (NC-NCO@C) nanotubes were prepared by a one-step molten salt method, which showed excellent lithium storage performance and stability as anode materials for lithium-ion batteries. The construction of ternary complexes of NC, NCO, and carbon effectively reduced volume change, increased electrical conductivity, and improved cycling stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Chemical
Denghui Chen, Qiushi Song, Hongwei Xie, Zhiqiang Ning, Qian Xu
Summary: A simple method of synthesizing carbon powder through electro-oxidization of solid CaC2 particles in molten salt was proposed. The electro-oxidization process was considered thermodynamically and dynamically. The carbon powder was characterized and evaluated for Li storage performance in a half-cell configuration. Highly disordered carbon powder was obtained at a cell voltage above 0.5 V. At 2.0 V, the prepared carbon powder consisted of thin carbon flakes with a specific surface area of 720.8 m(2)·g(-1). The carbon powder exhibited an initial reversible capacity of 932 mAh·g(-1) at 100 mA·g(-1) and a capacity of 869 mAh·g(-1) after 200 cycles. The carbon powder showed good rate performance (397 mAh·g(-1) at 1000 mA·g(-1)), making it attractive for anode materials.
Article
Chemistry, Analytical
Ashwin Kumar Myakalwar, Claudio Sandoval, Benjamin Sepulveda, Rodrigo Fuentes, Roberto Parra, Eduardo Balladares, Alejandro Vasquez, Daniel Sbarbaro, Jorge Yanez
Summary: This research demonstrates the suitability of stand-off LIBS for real time monitoring of desulfurization in molten copper, and reports for the first time the real-time determination of sulfur concentration in the ppm range using low sensitive lines from the NIR region, which were validated by DOAS.
ANALYTICA CHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Fatme Trad, Alaa E. Giba, Xavier Devaux, Mathieu Stoffel, Denis Zhigunov, Alexandre Bouche, Sebastien Geiskopf, Remi Demoulin, Philippe Pareige, Etienne Talbot, Michel Vergnat, Herve Rinnert
Summary: This study investigates the influence of phosphorous atoms on the phase separation and optical properties of silicon nanocrystals. It is found that phosphorus incorporation modifies the growth mechanism of Si-NCs, promoting phase separation and leading to nanocrystal formation at lower annealing temperatures. The presence of phosphorus also affects the size and emission wavelength of Si-NCs, and low phosphorus content can significantly improve photoluminescence intensity.
Review
Geochemistry & Geophysics
Ashwin Kumar Myakalwar, Claudio Sandoval, Marizu Velasquez, Daniel Sbarbaro, Benjamin Sepulveda, Jorge Yanez
Summary: The review article discusses the latest advancements in monitoring molten phases in metallurgical processes using LIBS, covering modern experimental arrangements, patents, industrial applications, and the importance of temperature, pressure, and atmospheric composition in melting processes. It also highlights the need for development and limitations, as well as the use of machine learning and data processing techniques to enhance the effectiveness of LIBS systems.
Article
Materials Science, Multidisciplinary
Gerard Colston, Oliver Newell, Stephen D. Rhead, Vishal A. Shah, Maksym Myronov
Summary: The alloy silicon carbon (Si1-yCy) has various strain engineering applications, and increasing the strain in the alloy can lead to benefits in device applications. Micro-X-ray diffraction techniques were used to investigate the strain state and crystalline tilt of suspended Si1-yCy epilayers, revealing an increase in in-plane tensile strain of the alloy. This strain increase was found to be caused by slight tilts at the edges of the membranes, indicating potential for external strain enhancement.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Ceramics
Jiajun Hu, Jing Qin, Ziyi Zhou, Zhongqi Shi, Kang Peng, Kai Gao, Hongyan Xia
Summary: Due to its high chemical stability, thermal stability and appropriate band gap, boron phosphide (BP) shows great potential in the field of photoelectrochemistry. However, the current methods for synthesizing BP have issues such as long synthesis period, low yield and purity, which hinders its application. Therefore, finding a highly efficient and low-cost methodology is essential. In this study, a controllable molten salt method was used to synthesize BP, and the NaCl/KCl/LiCl eutectic molten salt was found to be the most effective in accelerating the formation and growth of BP at lower temperature. The maximum yield of BP in NaCl/KCl/LiCl salt could reach 71%. Additionally, the process and mechanism of BP formation were studied, and the synthesized BP showed good photocurrent response in photoelectrochemistry testing.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Cheng-Kai Xu, Guan-Wen Yang, Chenjie Lu, Guang-Peng Wu
Summary: This work reported a silicon-centered two-component catalyst that exhibits higher activity than its one-component analogue in the ring-opening polymerization of propylene oxide. The silicon atom in the catalyst shows appropriate electron density and a larger intramolecular cavity, leading to a better intramolecular synergic effect. A unique two-pathway initiation mode was proposed to explain the exceptional catalytic performance of the binary system.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Shuangxi Jing, Juanxiu Xiao, Yijun Shen, Biao Hong, Dong Gu, Wei Xiao
Summary: In this study, a template-free and one-step preparation method for silicon nanotubes (Si-NT) from electrochemical reduction of silica in molten salts was reported. The construction of Si-based nanotubes using silicate mediation offers a versatile and energy-efficient approach for the preparation of Si-based materials. Application of Si-NT-based electrodes in lithium-ion batteries showed excellent initial Coulombic efficiency and high reversible capacity.
Article
Materials Science, Ceramics
Jinguang Yang, Ping Wu, Li Wang, Shiping Zhang, Dan Yan, Ya-nan Li
Summary: The melt of silicon hinders nitridation in the direct nitridation of silicon. Therefore, a method to nitride molten silicon without agglomeration was proposed. The nitridation of molten silicon was found to be faster than the nitridation of solid silicon, resulting in micron clusters composed of submicron grains with high alpha-Si3N4 content.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Review
Chemistry, Multidisciplinary
Sai Krishna Padamata, Gudrun Saevarsdottir
Summary: Electrochemically produced Si in molten salts is suitable for manufacturing electronic and photovoltaic devices. The structure and morphology of Si deposits are influenced by factors such as electrolyte composition, current densities, precursors, temperature, and electrodeposition duration. To achieve Si electrodeposition, a less corrosive electrolyte that can dissolve Si species and is easily soluble in water is required. This review provides a brief analysis of Si production by electrolysis in molten salts.
FRONTIERS IN CHEMISTRY
(2023)
Article
Physics, Applied
Zidong Cai, Xuelin Yang, Zhaohua Shen, Cheng Ma, Zhenghao Chen, Danshuo Liu, Fujun Xu, Ning Tang, Xinqiang Wang, Weikun Ge, Bo Shen
Summary: A carbon-regulated Si substrate can reduce the RF loss of GaN-based HEMT buffer stacks by suppressing the formation of parasitic conductive channel. By combining the substrate engineering with low-temperature growth, the RF loss of the buffer stacks can be reduced to 0.13 dB/mm at 10 GHz without degrading the crystal quality. This work demonstrates the potential for fabricating high-quality and low-loss GaN-on-Si RF devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Bishnu P. Thapaliya, Alexander S. Ivanov, Hsin-Yun Chao, Meghan Lamm, Miaofang Chi, Harry M. Meyer III, Xiao-Guang Sun, Tolga Aytug, Sheng Dai, Shannon M. Mahurin
Summary: The efficient conversion of CO2 into value-added graphite is a potential strategy to mitigate climate effects caused by CO2 emissions. In this study, CO2 was electrochemically converted into highly crystalline nano-graphite with controlled microstructure in a carbonate molten salt at 780 degrees C. The CO2-converted graphite exhibited high reversible capacity, long cycle life, and excellent rate capability when used as an anode material for LIBs.
Article
Spectroscopy
Piyali Deb Barman, Ashok Kumar Maurya, Subhendu Ghosh, Ankit Roy, Mukul Madaan
Summary: In X-ray spectroscopic studies, K beta 1,3 lines have been used to examine the chemical states of 3d transition metals, but are not suitable for characterizing iron oxides. Instead, FeL-lines, which involve the valence shell 3d electrons, were inspected and found to provide information on the chemical states of iron. The study established a linear relationship between the chemical shift of FeL beta 1 line and spin multiplicity, allowing for the speciation of iron.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2024)
