Photoinduced processes in chromophore–gold nanoparticle assemblies

Abstract

Development of nanotechnology requires that the interaction between components of nanoscale devices can be studied and understood better. Photoinduced processes between small (2–5 nm in core diameter) gold nanoparticles (GNPs) and chromophores, including porphyrin, fullerene, and phthalocyanine, were studied. Two methods were selected for controlled assembly of chromophores and gold particles at close distances: thin films and covalent attachment, which yields chromophore-functionalized particles. Time-resolved spectroscopic and photoelectrical measurements carried out further confirmed the known strong effect of GNPs on photoexcited chromophores that leads to fast photoinduced processes. When GNPs are combined with suitable chromophores, the particles can act as electron donors or acceptors. GNPs are efficient energy acceptors, and some indications of their ability to act as energy donors were obtained. The participation of the GNPs in photoinduced charge transfer in addition to energy-transfer processes makes them attractive components for photoactive devices.