Abstract(s) :

(Anglais) Controlling intrinsic optical properties by film thickness Nano-objects and more particularly metal nanoparticles (NPs) play a central role in the development of nanotechnology-based optical devices. The collective oscillations of their conduction electrons are at the origin of energy absorption: this is the so-called "Localized Surface Plasmon Resonance" (LSPR). Gold NPs and silver NPs can be synthetized in a polymer matrix (PVA) to produce nanocomposites absorbing in the visible range. Surprisingly, coating of the solid substrate by the same AgNO3/PVA solution at increasing dilutions leads to a red-shift of the surface plasmon resonance peak, clearly suggesting changes in the structural parameters of the so-synthesized nanoparticles.