Preparation and Process Clarification of Metal Nanoplate by Pulse Wire Discharged Method in Liquid Media

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The synthesis of triangular silver nanoplates on various substrates was studied in this work. A silver nanocolloid/solution was prepared by a pulsed wire discharged (PWD) method in deionized water with various wire diameters and relative energies ($K$), where $K$ is defined as the ratio of the charged energy of the capacitor to the vaporization energy of the wire. The effect of the substrate dipping time in the silver colloid/solution on silver nanoplate growth was investigated. The formation of the silver nanoplate has been analyzed using X-ray diffraction (XRD) with Cu K$\alpha$ radiation and scanning electron microscopy (SEM). The results indicated that silver nanoplates were formed on Cu, W, Ni, and Si substrates but not on SiO2 substrates with increasing $K$. The size or number of silver nanoplates increased rapidly on Si(100) substrates. With increasing substrate dipping time, the size or the number of triangular silver nanoplates linearly increased. It was concluded that the ionization of silver atoms in the discharge and the reduction of silver ions on the substrates are possible mechanisms behind the formation of silver nanoplates on substrates.
2011-01-25