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Retraction published on 14 December 2018, see Nanomaterials 2018, 8(12), 1047.
Open AccessArticle

Synthesis, Optical and Structural Properties of Copper Sulfide Nanocrystals from Single Molecule Precursors

Department of Chemistry, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
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Author to whom correspondence should be addressed.
Academic Editors: Shirley Chiang and Thomas Nann
Nanomaterials 2017, 7(2), 32; https://doi.org/10.3390/nano7020032
Received: 5 August 2016 / Revised: 18 October 2016 / Accepted: 30 November 2016 / Published: 4 February 2017
We report the synthesis and structural studies of copper sulfide nanocrystals from copper (II) dithiocarbamate single molecule precursors. The precursors were thermolysed in hexadecylamine (HDA) to prepare HDA-capped CuS nanocrystals. The optical properties of the nanocrystals studied using UV–visible and photoluminescence spectroscopy showed absorption band edges at 287 nm that are blue shifted, and the photoluminescence spectra show emission curves that are red-shifted with respect to the absorption band edges. These shifts are as a result of the small crystallite sizes of the nanoparticles leading to quantum size effects. The structural studies were carried out using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and atomic force microscopy. The XRD patterns indicates that the CuS nanocrystals are in hexagonal covellite crystalline phases with estimated particles sizes of 17.3–18.6 nm. The TEM images showed particles with almost spherical or rod shapes, with average crystallite sizes of 3–9.8 nm. SEM images showed morphology with ball-like microspheres on the surfaces, and EDS spectra confirmed the presence of CuS nanoparticles. View Full-Text
Keywords: CuS; dithiocarbamate; nanoparticles; electron microscopy; atomic force microscopy (AFM) CuS; dithiocarbamate; nanoparticles; electron microscopy; atomic force microscopy (AFM)
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Ajibade, P.A.; Botha, N.L. Synthesis, Optical and Structural Properties of Copper Sulfide Nanocrystals from Single Molecule Precursors. Nanomaterials 2017, 7, 32.

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