Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Wire-like Bundle Arrays of Copper Hydroxide Prepared by the Electrochemical Anodization of Cu Foil

  • La, Duc-Duong (Department of Applied Chemistry, and Graduate School of Bio-Nano Engineering, Hanyang University) ;
  • Park, Sung-Yeol (Department of Applied Chemistry, and Graduate School of Bio-Nano Engineering, Hanyang University) ;
  • Choi, Young-Wook (Process Materials Research Institute, Cheil Industries Inc.) ;
  • Kim, Yong-Shin (Department of Applied Chemistry, and Graduate School of Bio-Nano Engineering, Hanyang University)
  • Received : 2009.08.05
  • Accepted : 2010.06.23
  • Published : 2010.08.20
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Abstract

Nanostructured copper compounds were grown by electrochemical anodization of copper foil in aqueous NaOH under varying conditions including electrolyte concentration, reaction temperature, current density, and reaction time. Their morphology and atomic composition were investigated by using SEM, TEM, XRD, EDS and XPS. At the conditions ([NaOH] = 1 M, $20^{\circ}C$, $2\;mA\;cm^{-2}$), wire-like orthorhombic $Cu(OH)_2$ nanobundles with an average width of 100 - 300 nm and length of $10\;{\mu}m$ were synthesized with the preferential [100] growth direction. Furthermore, when the concentration decreased to 0.5 M NaOH, the 1D nanobundle structure became narrower and longer without any change in compositions or crystalline structure. Side reaction pathways appeared to compete with the 1D nanostructure formation channels: the formation of CuO nanoleaves at $50^{\circ}C$ via the sequential dehydration of $Cu(OH)_2$, CuO/$Cu_2O$ aggregates in 4 M NaOH, and $Cu_2O$ nanoparticles and CuO nanosheets at lower current density.

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