This paper compares the capability of dynamic light scattering (DLS) analysis and atomic force microscopy (AFM) for characterizing size of various nanoparticles in the size range 15-40 nm. Polyelectrolyte-protected gold nanoparticles have been obtained by heating different polyethylenimine containing polyelectrolyte/HAuCl₄ aqueous solutions. Experimental data indicate that different initial molar ratios of polyelectrolyte to gold allow to control the size of well-stabilized gold nanoparticles. The average AFM size of gold nanoparticles is 18.4+/- 2.6 nm and is slightly lower than that obtained using DLS (22.0 +/-3.5 nm).Comparison of experimental data from DLS and AFM demonstrates good correlation in measurements of size and its distribution using both methods. Measurement of changes in nanoparticles’ size during their functionalization is relatively easy using either of these methods.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/12095 must be provided.

1. The influence of the tannic and gallic acid on the size and monodispersity of synthesized gold and silver nanoparticles