Abstract
Highly monodispersed Ag nanoparticles (NPs) were prepared by a sonochemical method, in which Ag + in an ethanol solution of AgNO 3 was reduced by ultrasound irradiation in the presence of benzyl mercaptan without the additional step of introducing other reducing reagents or protective reagents. In addition to the stabilizing effect, benzyl mercaptan remarkably enhanced the reduction rate, probably due to the thermal decomposition that occurs at the interfacial region between cavitation bubbles and bulk solution and provides reducing radicals. More importantly, the size of Ag NPs can be controlled by simply tuning the initial molar ratio of benzyl mercaptan to Ag, which was confirmed by transmission electron microscopy and ultraviolet-visible absorption spectrometry, as well as X-ray diffraction.
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