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Preparation and characterization of CdSe nanoparticles stabilized by PVA using sonochemistry method
|Yashar Azizian kalandaragh 1, Mustafa B. Muradov 1, Rasim K. Mamedov 1, Ali Khodayari|
1. Baku State University (BSU), Z.Khalilov str.23, Baku, Azerbaijan
Semiconductor CdSe nanoparticles were prepared using cadmium acetate (C4H6CdO4.2H2O) as a Cd2+ ion source and Sodiumselenosulfate (Na2SSeO3) as a Se2- ion source by inducement ultrasonic irradiation at room temperature (27°C) and normal laboratory conditions and ambient pressure. Polyvinyl alcohol (PVA) was used as a matrix and stabilizer. The obtained particles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and UV-Vis spectrophotometer. SEM images show that the CdSe nanoparticles formed uniformally in polymer matrix; consist of spherical nanocrystallites aggregated in the form of polydispersive nanoclusters of about 100nm in dimension. The nanoparticles in PVA polymer matrix prepared by ultrasonic waves were more monodispersed than prepared particles in aqueous media by other methods in the same technology conditions. XRD pattern of as-prepared nanoparticles show that the nanoparticles are pure and crystalline in nature. From UV-Vis absorption spectra a great blue shift of about 3eV in band gap was observed due to quantum confinement effect. Elemental analysis of as-prepared samples from EDAX show that the atomic percent of Cd to Se was 50 to 50, are exactly stoichiometric. The size of particles from observed SEM images and calculated from XRD pattern and UV-Vis absorption spectra confirm each other.
Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Yashar Azizian kalandaragh
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-18 19:18 Revised: 2009-06-07 00:44