Photoinduced thermal copper reduction onto gold nanocrystals under potentiostatic control

Article Abstract:

The photoreduction of adsorbed copper ions onto Au nanoparticles, on an indium tin oxide (ITO) electrode in an aqueous electrochemical cell, is studied as a function of applied voltage and laser intensity. The numerical simulation of the Butler-Volmer kinetic equation has predicted several orders of magnitude increase in current for a temperature rise of a few Kelvin, which is sufficient to cause measurable difference in the surface properties of gold nanoparticles and facilitate the deposition of copper.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Primary copper, Gold, Secondary nonferrous metals, Analysis, Copper, Thermal properties, Chemical reaction, Rate of, Chemical kinetics, Copper (Metal), Chemical properties

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Correlation between spin-orbital coupling and the superparamagnetic properties in magnetite and cobalt ferrite spinel nanocrystals

Article Abstract:

The superparamagneic properties of CoFe2O4 and Fe3O4 nanocrystals were systematically investigated. The effect of much stronger spin-orbital coupling at [Co.sup.2+] lattice sites leads to a higher magnetic anisotropy and results in discrepancy of superparamagentic properties between CoFe2O4 and Fe3O4 nanocrystals indicating that it is possible to control the superparamagentic properties through magnetic coupling at the atomic level in spinel ferrite nanocrystals.

Science & research, Research, Nanotechnology, Magnetic properties, Magnetite, Ferrites (Magnetic materials)

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