| Abstract
| - CS2-stabilized silver nanoparticles of ∼6 nm in diameter are prepared in aqueous solution via chemicalreduction of Ag+ ions by KBH4 in the presence of CS2. The product is proven to be Ag by X-ray powderdiffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electron diffraction (ED) patterns. In theUV−visible spectra, an intense surface plasmon is built up at 350−500 nm, and it is centered at 395 nmafter the reduction of Ag+ ions. This can be assigned to a reaction product of Ag with CS2 because of thestrong affinity of S on the surface of Ag particles. The silver nanoparticles in the presence of CS2 remainstable for months at room temperature. It is also found that the absorption band in the range 300−350nm increases, is centered at 325 nm, and depends on the concentration of CS2, which maybe a derivative(CS or CnSm of CS2). Again the catalytic reduction of a dye, 2,7-dichlorofluorescein (DCF), in the presenceof CS2-stabilized silver particles is investigated.
|
