Effect of Cu doping on the optical property of green synthesised l -cystein-capped CdSe quantum dots

Oluwatobi Samuel Oluwafemi, Sundararajan Parani, Thabang Calvin Lebepe, Rodney Maluleke

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In the present study, the synthesis of water-soluble copper-doped CdSe nanoparticles (NPs) via a low cost, facile, and environmentally benign method is reported. Simple reagents such as selenium powder, cadmium chloride, and copper sulphate were used as selenium, cadmium, and copper precursor, respectively, while l-cysteine was used as a capping ligand without the use of an additional stabiliser. The as-synthesised copper-doped CdSe NPs were characterised using ultraviolet (UV-Vis) absorption and photoluminescence (PL) spectroscopy, Fourier-transform infrared spectroscopy, and transmission electron microscopy. By varying the dopant concentration, the temporal evolution of the optical properties and the shape of the nanocrystals were investigated. The observation and the results showed that the colour of the solution changed rapidly from orange to black, and the PL shifted to a longer wavelength at the high dopant concentration. The micrographic images revealed that the as-synthesised materials are small and could be used for bio labelling.

Original languageEnglish
Pages (from-to)805-810
Number of pages6
JournalGreen Processing and Synthesis
Issue number1
Publication statusPublished - 1 Jan 2021


  • copper
  • doping
  • green synthesis
  • photoluminescence
  • quantum dots

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Chemical Engineering
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Industrial and Manufacturing Engineering
  • Health, Toxicology and Mutagenesis


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