Formation of ZnSe and US quantum dots via laser ablation in liquids

Formation of nanoparticles of both ZnSe and US under ablation of corresponding bulk semiconductors in liquid environment (diethyleneglycol, ethanol, etc.) using radiation of a Cu vapor laser is reported. X-ray diffraction (XRD), resonance Raman scattering (RRS), and transmission electron microscopy (TEM) confirm that the nanoparticles are crystalline and have average size of ca 10-20 nm. RRS of nanoparticles are characterized by several peaks multiple to frequency of corresponding phonon (LO replicas). (C) 2002 Elsevier Science B.V. All rights reserved.