Metal nanoparticles show unique properties that are different from those of bulk metals. These properties are dependent on their shapes and sizes. We prepare nanoparticles with various shapes and ones with narrow size distributions. Fluorescence intensities are enhanced at the acuate front ends of nanoparticles and/or at the gaps between nanoparticles. The protective agents of nanoparticles, such as ligands, polymers and surfactants, are exchanged for fluorophores easily to adsorb the surfaces of nanoparticles.
The photoinduced reactions on the micellar and vesicular systems and the properties of the micellar and vesicular systems are studied.