An additive-free electrochemical route to rapid synthesis of large-area copper nano-octahedra on gold film substrates |
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Authors: | SC Tang XK Meng S Vongehr |
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Institution: | National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, 22nd Hankou Road, Nanjing, Jiangsu 210093, PR China |
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Abstract: | We report the first fabrication of large-area Cu nano-octahedra with well-defined shape, good monodispersity and uniform distribution on a gold film substrate (GFS) by a very simple, rapid and cost-effective low-potential electrodeposition (LPED) technique. Different from general surfactant-assisted electrochemical approaches, LPED is an additive-free strategy that exploits the subtle surface energy differences among various crystallographic planes of metals themselves. The size of the octahedra depends on deposition time and is adjustable over a wide range. The shape evolution is found to be remarkably different from that of octahedral particles formed in solution. A formation mechanism is proposed for the unique evolution of Cu octahedra as resulting from the anisotropic growth under appropriate applied potentials. |
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