Abstract
Abstract 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.
Highlights
In the present study, the synthesis of watersoluble copper-doped CdSe nanoparticles (NPs) via a low cost, facile, and environmentally benign method is reported
The same trend was observed in the PL spectra, where the QDs synthesised at pH value of 11 showed the highest intensity and narrow emission, with the peak centred at 435 nm
We have reported the synthesis of Cu-doped NPs via a facile, “green”, and environmentally benign method using L-cysteine as a capping agent
Summary
Abstract: In the present study, the synthesis of watersoluble 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. L-Cysteine is an essential amino acid naturally found in the human body and available in the pharmaceutical market as a dietary supplement It is a biocompatible and environmentally suitable material for green synthesis [11,12]. The resultant particles were dissolved in water to give a solution of nanocrystallite for further characterisations
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