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

Emilia Tomaszewska ,  Jaroslaw Grobelny ,  Grzegorz Celichowski 

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

Abstract
Metal particles in the nanometer size range have gained considerable interest in recent years. Nanoparticles possess unique optical, electrical, and mechanical properties, which are strongly dependent on the size and shape of the particle. Antibacterial properties of gold and silver nanoparticles have potential applications in the pharmaceutical and cosmetic industries and also for the diagnostics of the biological probes.

Tannic and gallic acids posses antibacterial activity, in this way they increase bioactivity of Au and Ag nanoparticles. These acids act as reducing and stabilizing agents, which ensures high monodispersity of colloids.

We describe a simple method to synthesize silver and gold nanoparticles by chemical reduction. Soluble metal salts (AgNO3, HAuCl4) were used in the particle synthesis. Sodium citrate, tannic and gallic acids were used as reducing and stabilizing agents. The resultant nanoproducts were characterized by Dynamic Light Scattering (DLS) and Atomic Force Microscopy (AFM). We report the preparation of silver nanoparticles in the range of
4–50 nm and gold nanoparticles in the range from 10nm to 100 nm. Synthesized nanoparticles are very stable and monodisperse. Tannic and gallic acids were found to be excellent additives to control the nanoparticles sizes.

This work was partially supported by MNiSW grant nr N N507 350435.

This work was partially supported by grant from Iceland, Liechtenstein
and Norway through the EEA Financial Mechanism and Foundation for
Polish Science - Homing Program.

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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium F, by Emilia Tomaszewska
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-25 18:09
Revised:   2009-06-30 20:37
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