摘要
Silver colloids have been prapared by laser-induced reduction of silver nitrate.The.properties of the colloids were studied with transmission electron microscopy,visible-ultraviolet absorption and Raman spectroscopy.We Rnd that the growth of the silver grains is dependent on the laser illumination time.Two characteristic absorption bands of the colloids are located near 390 and 560nm,respectively.Not only are the silver colloids much cleaner than those prepared by chemical reduction methods,but also surface enhanced Raman scattering active.The method may be of interests for ultrafine particle studies as well.
