, Volume 52, Issue 9, pp 2709-2714
Date: 05 Aug 2009

Controllable synthesis of metal particles by a direct current electrochemical approach

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Shapes of copper and silver particles were successfully controlled by using a very simple, effective direct-current electrochemical approach without introducing any additives or templates. A diverse range of shapes and also different inner structures were thus accessible. The products prepared at relatively high potentials have flowerlike morphologies and exhibit flakes as building blocks. The uniformly thick flakes intersect mutually, have smooth surfaces and outwardly wavy edges. The particle diameter and the flake density can be easily controlled by changing potential and/or deposition time. With a decrease of potential, the particles’ shapes changed from flower to bud, to sphere and to octahedron. Surface plasmon resonance (SPR) properties of the supported metal particles were investigated by UV-Vis diffuse reflectance spectra (UV-Vis DRS) and surface enhanced Raman scattering (SERS). It was found that the copper octahedra exhibited three characteristic bands, and SERS effect increases with the number of flakes within individual particles. Based on the experimental results, the mechanism for direct-current electrochemical growth of metal nanostructures was discussed.