Article Abstract:
Experiments using high-resolution size exclusion chromatography (HRSEC), dynamic light scattering, and transmission electron microscopy are conducted to investigate the effects of aging of Au nanoclusters in the presence of surfactant ligands. It is observed that contrary to the expectation that aging in solution will always broaden the size dispersion and increase the average size (Ostwald ripening), a narrowing of the size dispersion and change in average size can occur with time under ambient conditions.
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Article Abstract:
Gold nanostructured films of various thicknesses are deposited over regular arrays of polystyrene nanospheres in order to evaluate their potential as surface-enhanced Raman spectroscopy (SERS)-active substrates. The large tunability of surface plasmon excitation combined with the advantage of relatively high exhibited average enhancement factor values obtained under near-infrared excitation has recommended these substrates as very good candidates for biological relevant molecules.
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Article Abstract:
Gold nanoparticles are readily oxidized by Au(III) in the presence of cetyl-trimethylammonium bromide (CTAB). It can be concluded that the mechanism of oxidation depends on whether the oxidant is attached to CTAB micelles.
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