DLS and AFM in measuring of gold nanoparicles.

Grzegorz Celichowski ,  Michal Cichomski ,  Jaroslaw Grobelny 

University of Łódź, Department of Chemical Technology and Environmental Protection, Pomorska 163, Łódź 90-236, Poland

Abstract

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.

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Presentation: Poster at E-MRS Fall Meeting 2007, Acta Materialia Gold Medal Workshop, by Grzegorz Celichowski
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-28 14:32
Revised:   2009-06-07 00:44
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