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Facile one-pot synthesis of polytypic (wurtzite–chalcopyrite) CuGaS2

Vahidshad, Y ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1007/s00339-016-9637-2
  3. Publisher: Springer Verlag , 2016
  4. Abstract:
  5. Abstract: In this investigation, monodisperse CuGaS2 nanoparticles intended for use as visible-light-absorbing materials were synthesized using a facile one-step heating method that involved dissolving the precursors copper chloride, gallium acetylacetonate, and thiourea in a solvent consisting of either oleylamine alone or a combination of oleylamine, oleic acid, and 1-octadecene. The shapes of the resulting nanoparticles were either elongated, polygonal, or a mixture of both, depending on whether the crystal structure of the nanoparticles was predominantly wurtzite, predominantly chalcopyrite, or a more balanced mixture of both wurtzite and chalcopyrite (i.e., the nanoparticles were polytypic: both wurtzite and chalcopyrite phases were present). The crystal structure of the synthesized nanoparticles was found to be influenced by the temperature and the solvent applied during synthesis. X-ray diffraction data for the nanoparticles indicated that applying a temperature of 270 °C or using oleylamine, oleic acid solvent, and 1-octadecene during synthesis tended to yield a chalcopyrite phase, whereas applying a somewhat lower temperature (210 °C) or using oleylamine alone during synthesis tended to result in a wurtzite phase. The chemical states of the compounds obtained at different temperatures and using various solvents, as well as their crystal structures, morphologies, and optical properties were characterized via X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, ultraviolet–visible spectroscopy, and photoluminescence. Graphical abstract: Optical absorbance spectrum (red line) and photoluminescence spectrum (black line) of a CuGaS2 solid solution, and applications of this material in optoelectronics (photos below the spectra)[Figure not available: see fulltext.] © 2016, Springer-Verlag Berlin Heidelberg
  6. Keywords:
  7. Chemical compounds ; Chlorine compounds ; Copper compounds ; Crystal structure ; High resolution transmission electron microscopy ; Mixtures ; Nanoparticles ; Oleic acid ; Optical properties ; Photoluminescence ; Photoluminescence spectroscopy ; Plasma diagnostics ; Solvents ; Synthesis (chemical) ; Transmission electron microscopy ; X ray diffraction ; Zinc sulfide ; Absorbing materials ; Gallium acetylacetonate ; Lower temperatures ; One-pot synthesis ; Optical absorbance ; Photoluminescence spectrum ; Visible spectroscopy ; X-ray diffraction data ; X ray photoelectron spectroscopy
  8. Source: Applied Physics A: Materials Science and Processing ; Volume 122, Issue 3 , 2016 , Pages 1-10 ; 09478396 (ISSN)
  9. URL: https://link.springer.com/article/10.1007%2Fs00339-016-9637-2