The dispersions of silver nanoparticles display intense
colors due to the plasmon resonance absorption. The surface
of a metal is like a plasma, having free electrons in the
conduction band and positively charged nuclei. Surface
Synthesis of silver nanoparticles by chemical
reduction method and their antibacterial activity
Maribel G. Guzmán, Jean Dille, Stephan Godet
I
International Journal of Chemical and Biomolecular Engineering 2:3 2009
104
Plasmon resonance is a collective excitation of the electrons in
the conduction band; near the surface of the nanoparticles.
Electrons are limited to specific vibrations modes by the
particle’s size and shape. Therefore, metallic nanoparticles
have characteristic optical absorption spectrums in the UV-Vis
region