Structural, optical and thermal properties of silver colloidal nanoparticles

¹ Young Researchers Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Islamic Republic of Iran
² Department of Physics, Faculty of Science, Urmia University, Urmia, Islamic Republic of Iran

^a e-mail: shahram22s2000@yahoo.com

Received: 4 August 2011
Revised: 28 December 2011
Accepted: 19 March 2012
Published online: 9 May 2012

Abstract

In this paper, colloidal silver nanoparticles were prepared by chemical reduction of AgNO₃ and pure Sn in a new and simple method. The type of crystallite lattice and the size of nanopowders were estimated by X-Ray Diffraction (XRD) analysis. The geometric, heterogeneous and mixing structure of synthesized nanopowders were studied by Scanning Electron Microscopy (SEM). Optical properties such as plasmon absorption and frequency of soluble colloidal nanopowders in two solutions of distilled water and oil were investigated by UV-Visible spectroscopy, which was developed to calculate the absorbance spectra of nanoparticles solution containing a size distribution of particles using the Mie theory. Dipole and quadrupole plasmons related to molecular structure of water and oil were found by absorbance spectra. Also, Differential Scanning Calorimetry (DSC) analysis was used for determining the thermal behavior, endothermic and exothermic peaks of Ag nanopowder.