Nanocrystals (50-250 nm) of a Palladium complex within a polyisobutylmethacrylate matrix were prepared by a phase separation method. In these dispersions, a light-induced birefringence with n < 10-3 was induced, without the application of an electric field. This effect was related to the photoconducting properties of the dispersion. Evidence for charge photogeneration without any applied field was obtained. The photorefractive behaviour of the material confirmed that the nanocrystals reorientation is a consequence of photoconducting properties. A lightgenerated electric field E < 3 V/¼m was estimated. These results illustrate the potential of materials with a nano-crystalline dispersion morphology as light-responsive media.
Light-induced reorientation and birefringence in polymeric dispersions of nano-sized crystals
Termine R;Ghedini M;Golemme A
2008
Abstract
Nanocrystals (50-250 nm) of a Palladium complex within a polyisobutylmethacrylate matrix were prepared by a phase separation method. In these dispersions, a light-induced birefringence with n < 10-3 was induced, without the application of an electric field. This effect was related to the photoconducting properties of the dispersion. Evidence for charge photogeneration without any applied field was obtained. The photorefractive behaviour of the material confirmed that the nanocrystals reorientation is a consequence of photoconducting properties. A lightgenerated electric field E < 3 V/¼m was estimated. These results illustrate the potential of materials with a nano-crystalline dispersion morphology as light-responsive media.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
