Crystalline Evaluation of Size-Controlled Silicon and Silicon Oxide Nanoparticles Produced by Solution Plasma Discharge

Abstract

Li-ion batteries using Si particles as anode materials have attracted attention because of their extremely high theoretical capacities. However, they experience extensive volume expansion during lithiation in the process of charging, dramatically affecting the battery lifetime. To mitigate these expansion effects and improve the capacity, Si nanoparticles and occasionally SiO x particles have been effective. Therefore, the production of Si nanoparticles is necessary. For these purposes, the solution plasma discharge method was applied. We improved previous work on the plasma discharge method by adjusting the electrolyte medium conditions via controlling the pH, solution conductivity, electrolyte concentration, and voltage, successfully generating Si nanoparticles with diameters of <10 nm and SiO x particles of <50 nm in diameter. These crystalline Si and amorphous SiO x particles were characterized using microscopy and spectroscopy. [

Review of “12th Japanese-Polish Joint Seminar on Micro and Nano Analysis (August 29–September 1, 2018)”

“…Conventional electron microscopy techniques, such as bright-and dark-field TEM and high-resolution TEM observations, are still useful for analyzing the materials, and several researchers reported the results of the structural characterization of metals, 3,5,8) semiconductors, 4) and composite materials 7,9) in the seminar. Electron diffraction can provide scattering information over a wide range of the reciprocal lattice space, due to the short wavelength of highenergy electrons.…”

Upconversion Luminescence Properties of Gd₂O₃: Er³⁺ Nanospheres and Gd₂O₃: Er³⁺@Silica Nanocomposites

“…The synthesis method, preparation condition for the wet chemical reaction and the critical heating treatment regime greatly affect the quality and behavior of the nanophosphors. 1,10,27) For the case of Gd 2 O 3 : Er 3+ the apropos annealing temperature is 650°C or higher. The integration of material composition, surface treatment and heat treatment of a nano phosphor to toward developing an application is essential.…”

“…evaluate of size, shape and multilayered structure of nanostructured spheres. 27) In the field of Rare Earth (nano), the oxide is as potential antibacterial materials when used in a suitable polymer reported. 28) The splitting of the spectrum of Gd 2 O 3 : Yb 3+ , Er 3+ nanospheres indicates the poly-nanocrystalline nature of nanospheres product at several hundred nm, and it is also related to the crystal symmetry features.…”