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International Journal of Analytical Chemistry
Volume 2014, Article ID 832657, 6 pages
http://dx.doi.org/10.1155/2014/832657
Research Article

Analysis of the Evolution of Tannic Acid Stabilized Gold Nanoparticles Using Mie Theory

1Physics Department, University of Abou Bekr Belkaid, 13000 Tlemcen, Algeria
2Chemistry Department, University of Abou Bekr Belkaid, 13000 Tlemcen, Algeria
3Materials Science and Engineering Department, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15243, USA

Received 8 September 2014; Accepted 10 November 2014; Published 23 November 2014

Academic Editor: Jiu-Ju Feng

Copyright © 2014 Assia Rachida Senoudi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Spherical gold nanoparticles (GNPs) have been synthesized in aqueous solutions using sodium citrate (SC) and tannic acid (TA) as reducing and stabilizing agents. Upon addition of TA and compared to the GNP TA-free aqueous solutions, a reduction of the GNPs size and consequently a dramatic change of their optical properties have been observed and quantitatively analyzed using Mie theory. An increase in the concentration of TA reveals a modification of the colloidal solution refractive index that is evidenced by the shift in the peak position of the localized surface plasmon resonance (LSPR) band. The variations of the peak absorbance with the TA concentration are examined in the low and high concentration regimes.