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Structural, compositional and optical characterization of water soluble CdS nanoparticles synthesized by ultrasonic irradiation

Y. A. KALANDARAGH1,2,* , M. B. MURADOV1, R. K. MAMEDOV1, M. BEHBOUDNIA2, A. KHODAYARI3

Affiliation

  1. Department of Physics, Nanocenter, Baku State University, Z. Khalilov 23, Az1148,Baku, Azerbaijan
  2. Department of Physics, The University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran
  3. Department of Chemistry, The University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran

Abstract

Nanostructure CdS particles have been successfully prepared by chemical reaction of cadmium acetate (C4H6CdO4.2H2O) as a Cd2+ ion source and thiourea (H2NCSNH2) as a S2- ion source in aqueous media with inducement ultrasonic irradiation at room temperature and normal laboratory conditions. This simple and one step preparation can be considered as a green synthesis. The obtained particles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and UV-Vis spectrophotometer. XRD pattern reveals that the CdS nanoparticles formed are highly pure and are crystalline in nature with cubic structure. SEM images shows that the product consists of spherical nanocrystallites of about 20nm which aggregated in the form of polydispersive. Energy dispersive X-ray analysis (EDAX) shows that the proportion of cadmium to sulfur is neatr to Cd:S=1:1, showing that the product is almost stoichiometric. Optical measurements indicate a direct band gap of about 4.69 eV. There was observed a blue shift of about 2.29 eV, in comparison to its bulk value due to quantum confinement effects of electrons and holes.

Keywords

CdS, Nanostructure, XRD, EDAX, UV-Vis spectrometry, SEM, Quantum confinement effect.

Citation

Y. A. KALANDARAGH, M. B. MURADOV, R. K. MAMEDOV, M. BEHBOUDNIA, A. KHODAYARI, Structural, compositional and optical characterization of water soluble CdS nanoparticles synthesized by ultrasonic irradiation, Optoelectronics and Advanced Materials - Rapid Communications, 2, 1, January 2008, pp.42-45 (2008).

Submitted at: Dec. 18, 2007

Accepted at: Jan. 16, 2008