Green synthesis of CdSe nanoparticles at room temperature and its characterisation

L-Cysteine stabilised semiconductor CdSe nanoparticles were synthesised in aqueous medium by simple greener wet chemical method at room temperature from CdCl₂.21/2H₂O and Na₂SeO₃.5H₂O and elemental selenium precursors for a short duration. The synthesised CdSe nanoparticles were characterised by powder X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV-visible, transmission electron microscopy (TEM) and selected area electron diffraction (SAED) techniques. The powder XRD pattern and SAED pattern were in good agreement with each other and conform to the formation of single-phase CdSe nanoparticles. The FTIR studies reveal the capping effect of L-Cysteine in the formation of CdSe nanoparticles. The absorption maxima in UV-visible spectra clearly indicate the size quantisation effect and TEM image reveals that the size of the CdSe is about 10 nm.