Silver nanoparticles were prepared by pulsed wire discharge (PWD) using silver wire in deionized water at various relative energy (K) from 10 to 98, which is ratio of the charged energy of the capacitor in the electrical circuit to the vaporization energy of the wire. From energy deposition calculated by the measured voltage and current waveforms, deposited energy of the wire was increased with increasing K. From X-ray diffraction (XRD) analysis, prepared nanoparticles were phase identified as silver. From transmission electron microscopy observations, the shape of prepared silver nanoparticles were spherical and the median particle diameter (D 50 ) and the geometric standard deviation (σ g ) were calculated from the particle distribution. D 50 was decreased from 34 to 19 nm with increasing K. The particle size in prepared by PWD in liquid media can be controlled by K.
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 Kα 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.
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