Formation of uniform size ultra-fine metal particles using reverse micelles and self-organization of two-dimensional arrays

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1. Formation of uniform size ultra-fine particlesFormation of uniform size ultra-fine particles was achieved using reverse micelles composed of di-dodecyldimethylammonium bromide (DDAB). The size of ultra-fine particles can be controlled by changing the concentration of metal ions which were solubilized into the water pool of the reverse micelles. DDAB reverse micellar system was superior than the reverse micellar system composed of di-oleylphosphate system for the formation of uniform size ultra-fine particles.2. Two-dimensional array of ultra-fine particlesThe effect of surface modification of fine particles on π-A relationship was measured using silica particles. Uniform dispersion of silica particles was achieved by spreading silica particles dissolved in chloroform, and two-dimensional array of silica particles on the hydrophobized glass plate was attained when the surface pressure exceeded the pressure corresponding to the closed pack state. Two-dimensional array of nano-size gold particles was achieved by the following method. The TEM mesh was brought parallel to the surface of the trough by hand. The surface of the TEM mesh was briefly contacted with the particle layer on the trough and lifted off. We could get two-dimensional array of gold particles in a wide range area.3. Nano-wires and network structure formation of gold particlesNano-wires and network structure composed of these nanowires were successfully synthesized by controlling the concentration of reducing agent in the formation process of nano-size gold particles in the aqueous phase. The network structure covered two-dimensional space uniformly.