Electronic states of metal nanoparticles investigated by far infrared spectroscopy

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The most important result of this project is the successful synthesis of monodispersed nanoparticles of platinum, palladium, and gold. For organic lgands which stabilizes metal nanoparticles, we used PAA or PVP for PT and Pd, while DT was useful for gold systems.Particularly, we have succeeded in fabricating two-dimensional monolayers of gold nanoparticles forming a hexagonal lattice. Furthermore, two-dimensional superlattice and three-dimensional aggregates were successfully constructed with use of interligand bridging by Fe^2 ions. We have also obtained important information on magnetic and spectroscopic properties. We found several series of absorption peaks in the far infrared spectra, which are not assigned to the absorption of Organic ligands. These peaks are most likely attributed to the transitions between quantized electronic levels in nanoparticles. A quantitative analysis based on the Woods-Saxon potential is underway,