ABSTRACT

When light interacts with plasmonic nanoparticles, their free

electrons are driven by the alternating electric field and collectively

oscillate at a resonant frequency leading to a phenomenon known

as surface plasmon resonance. The frequency and amplitude of the

resonance are sensitive to particle size and shape, which determine

how the free electrons are polarized and distributed on the surface.

As a consequence, control of the size and shape of plasmonic

nanoparticles represents the most powerful means to tailor and

finely tune their optical properties. In this chapter, a few among the

most important techniques enabling size/shape-controlled growth

of metal nanoparticles will be reviewed. Some examples of post-

synthesis nanoparticle purification and surface modification toward

plasmonic applications will also be provided.