The optical properties of supported Au nanoparticles with sizes of 1.3 nm, 1.6 nm, 2.5 nm, and 2.9 nm were studies by cavity ring-down spectroscopy in the photon energy range between 1.8-3.0 eV. The obtained results show the possibility to obtain optical information of nanoassembled materials with high sensitivity. The exptl. findings are compared to calcns. using Mie-Drude theory. Whereas the broadening of the surface plasmon resonance with decreasing size is well described by this model, the obsd. blue-shift of the surface plasmon resonance contradicts the predictions of the Mie-Drude theory. The latter effect can be explained by the presence of a skin region with decreased polarizability typical for coinage metal particles. Furthermore, it is found that the supported Au nanoparticles are robust under ambient conditions, an important issue when using these materials for optical applications. [on SciFinder(R)]     «

The optical properties of supported Au nanoparticles with sizes of 1.3 nm, 1.6 nm, 2.5 nm, and 2.9 nm were studies by cavity ring-down spectroscopy in the photon energy range between 1.8-3.0 eV. The obtained results show the possibility to obtain optical information of nanoassembled materials with high sensitivity. The exptl. findings are compared to calcns. using Mie-Drude theory. Whereas the broadening of the surface plasmon resonance with decreasing size is well described by this model, the o...     »