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 grant from Iceland, Liechtenstein
and Norway through the EEA Financial Mechanism and Foundation for
Polish Science - Homing Program.

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1. DLS and AFM in measuring of gold nanoparicles.