Laser-assisted synthesis of superparamagnetic Fe at the rate of Au core-shell nanoparticles

Article Abstract:

A novel method combining wet chemistry for synthesis of a Fe core, 532 nm laser irradiation of Fe nanoparticles and Au powder in liquid medium for deposition of an Au shell, and sequential magnetic extraction/acid washing for purification was developed to fabricate oxidation-resistant Fe at the rate of Au magnetic core shell nanoparticles. The surface plasmon resonance of the Fe at the rate of Au nanoparticles was red shifted and much broadened as compared with that of pure colloidal nano-gold, which was predominantly a shell-thickness effect.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Gold, Chemical synthesis, Chemical properties, Nanoparticles

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Variations of the geometries and band gaps of single-walled carbon nanotubes and the effect of charge injection

Article Abstract:

The geometries of neutral and charged carbon single-walled nanotubes (SWNTs) are calculated using density functional theory. Different zigzag nanotubes with n=3i, 3i+1 and 3i+2 show different dimensional changes upon the injection of small charge (0.01 e per carbon atom), and the dimensional changes approach that of graphite when the tube diameter increases.

Carbon, Density functionals, Density functional theory, Nanotubes, Atomic properties

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Synthesis of metal alloy nanoparticles in solution by laser irradiation of a metal powder suspension

Article Abstract:

Laser radiation can be used to prepare alloyed metal nanoparticles from suspensions of micrometer-sized metal powder mixtures. This is demonstrated by using UV-vis absorption spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and modelization.

Nonferrous Metal (except Copper and Aluminum) Rolling, Drawing, Extruding, and Alloying, Primary metal products, not elsewhere classified, Metal Powders & Paste, Laser beams, Metal powders, Optical properties, X-ray spectroscopy, Metal powder products

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