Effect of Concentration on Synthesis of Organic Passivated Cu2-xS Nanoparticles from N-Pyrrolidine Dithiocarbamate Molecular Precursor

K. Mnqiwu, T. Xaba*, M.J. Moloto, K.P. Mubiayi and T.P. Mofokeng

Department of Chemistry, Vaal University of Technology, Private Bag X021, Vanderbijlpark, 1900, South Africa

*Corresponding author: Fax: +27 86 6906606; Tel: +27 16 9509820; E-mail: thokozanix@vut.ac.za

Abstract

The synthesis of copper sulfide nanocrystals from bis(N-pyrrolidinedithiocarbamato) Cu(II) single molecule precursors have been achieved. Fourier-transform infrared (FTIR) spectroscopy, elemental analysis and thermogravimetric analysis (TGA) were used to characterize the prepared complex. Nanomaterials were further confirmed by optical properties and X-ray diffraction (XRD) confirmed that the final TGA product was CuS. The absorption spectra of copper sulfide nanoparticles showed a parabolic curve which is a characteristic of CuS covellite structure. The formation of hexagonal CuS covellite phase was investigated by XRD pattern. The TEM images showed that nanoparticles capped with tri-n-octylphosphine oxide (TOPO) were better passivated than those capped with hexadecylamine.

Keywords

Dithiocarbamate complex, N-Pyrrolidine dithiocarbamate, Copper sulfide, Nanoparticles, Tri-octylphosphine oxide.

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