Abstract
Polyol method is a type of soft chemical method employed to prepare stable fine transition metals (TMs), without using any sophisticated instruments in a normal clean room environment. In the present work, pure nano-sized copper powder was prepared by reduction of copper (II) chloride dehydrate with sodium hydroxide in the glycerol environment at reaction temperature of 160°C for 17min. The Field Emission Scanning Electron Microscopy (FESEM) observation of synthesized copper powder showed the particle dimensions varying from 70 to 400nm. The Energy Dispersive Spectroscopy (EDS) and X-ray Diffraction (XRD) analysis supported the 98.46% purity of synthesized copper powder. The Rietveld analysis confirmed the cubic structure for synthesized copper with cell parameter: a=3.63Å. Whereas the Ultraviolet–Visible Spectroscopy (UV–Vis) revealed damping of surface plasmon resonance due to inactive chloride monolayer at the particle surface. This copper powder heat-treated in carbon environment showed the presence of copper oxalate phase using XRD analysis, noted from the peaks at 36.2° and 46.4° for (120) and (200) planes, respectively; and Fourier Transform Infra Red (FTIR) Spectroscopy backed the presence of copper oxide (Cu2O).
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