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Aqueous synthesis of CdO nanoparticles under ultrasonic waves and evaluation of their structural, morphological and optical properties

N. S. JAVAN1,* , Y. AZIZIAN-KALANDARAGH2, A. KHODAYARI3

Affiliation

  1. Physics Department, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran
  2. Department of Physics, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran
  3. Department of Chemistry, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran

Abstract

Cd(OH)2 nanocrystals were prepared by inducement of ultrasonic waves using aqueous solutions of cadmium acetate and sodium hydroxide in presence of 5 mmol 3-Mercaptopropionic acid (3-MPA) as a capping agent. After thermal treatment at 250 oC during 1 hour, Cd(OH)2 nanocrystals transforms to CdO regime. The X-ray diffraction (XRD) studies display that the products are well crystallized in the form of cubic structure. Scanning electron microscope (SEM) images reveal that the product consisting of sphere nanocrystallites of about 30-50nm diameter, which aggregated in the form of polydispersive clusters. Optical measurements indicate a direct band gap of about 3.4 eV. There was observed a blue shift of about 1.1 eV, in comparison to its bulk value due to quantum confinement effects of electrons and holes..

Keywords

CdO nanoparticles, Ultrasonic waves, Quantum confinement effects, X-ray diffraction.

Citation

N. S. JAVAN, Y. AZIZIAN-KALANDARAGH, A. KHODAYARI, Aqueous synthesis of CdO nanoparticles under ultrasonic waves and evaluation of their structural, morphological and optical properties, Optoelectronics and Advanced Materials - Rapid Communications, 7, 9-10, September-October 2013, pp.639-642 (2013).

Submitted at: Dec. 25, 2012

Accepted at: Sept. 18, 2013