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788 results on '"Chu, Sheng-Yuan"'

13. Ligand-assisted reprecipitation synthesis of highly luminescent and stable CsPbBr3@SiO2 nanoparticles with formation kinetics analysis.

Author

Huang, Chien-Hao and Chu, Sheng-Yuan

Subjects
*PRECIPITATION (Chemistry), *NANOPARTICLES, *QUANTUM dots, *PHOTOLUMINESCENCE measurement, *WRAPPING materials, *LUMINESCENCE spectroscopy
Abstract

Cesium lead bromide (CsPbBr3) perovskite nanocrystals are becoming a popular alternative to chalcogenide quantum dots because of their bright green fluorescence and high color purity. However, owing to the poor stability caused by their highly ionic nature and the dynamic binding of long-chain capping ligands, their practical applications are limited. Although (3-aminopropyl)triethoxysilane (APTES) is a frequently used insulating material for wrapping CsPbBr3 nanocrystals, it often causes surface etching. To address this issue, we introduced oleic acid into the anti-solvent toluene to inhibit the etching effect of APTES using a modified room-temperature ligand-assisted reprecipitation process. We utilized in situ time-dependent photoluminescence measurements to study the formation kinetics of CsPbBr3 nanocrystals and determine the optimal ligands ratio. This innovative approach enables precise control over CsPbBr3@SiO2 nanoparticles synthesis, yielding uniformly shaped nanocrystals with a silica shell, a consistent size around 10.17 ± 1.6 nm, and enhanced photoluminescence quantum yields ranging from 90% and 100%. The photoluminescence lifetimes of our CsPbBr3@SiO2 nanoparticles were significantly prolonged owing to a reduction in non-radiative recombination. This boosts their stability in thermal and polar solvent environments, making them superior candidates for use in photonic devices. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Study of the Rolling Effect on MoS 2 –Carbon Fiber Density and Its Consequences for the Functionality of Li-Ion Batteries.

Author

Wu, Tai-Yu, Li, Xiao-Ru, Chen, Bo-Chun, Wang, Li-Wen, Wang, Jia-Hao, Chu, Sheng-Yuan, and Chang, Chia-Chin

Subjects
LITHIUM-ion batteries, COPPER foil, SOLID-phase synthesis, FIBERS, MOLYBDENUM disulfide, THICK films
Abstract

In this study, an electrode slurry composed of molybdenum disulfide (MoS2) and vapor-grown carbon fiber (VGCF) prepared through a solid-phase synthesis method was blade-coated onto copper foil to form a thick film as the anode for lithium-ion batteries. In previously reported work, MoS2-based lithium-ion batteries have experienced gradual deformation, fracture, and pulverization of electrode materials during the charge and discharge cycling process. This leads to an unstable electrode structure and rapid decline in battery capacity. Furthermore, MoS2 nanosheets tend to aggregate over charge and discharge cycles, which diminishes the surface activity of the material and results in poor electrochemical performance. In this study, we altered the density of the MoS2–carbon fiber/Cu foil anode electrode by rolling. Three different densities of electrode sheets were obtained through varying rolling repetitions. Our study shows the best electrochemical performance was achieved at a material density of 2.2 g/cm3, maintaining a capacity of 427 mAh/g even after 80 cycles. [ABSTRACT FROM AUTHOR]

Published
2024
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