Synthesis, structural, optical, morphological and elemental characterization of CTAB capped CdS quantum dots by facile chemical precipitation technique

Abstract

In the present work, we report synthesis of CTAB capped cadmium sulphide quantum dots (CdS QDs) employing facile chemical precipitation technique in non aqueous medium at room temperature. Cadmium nitrate tetra hydrate and sodium sulphide flakes and cetyltrimethyl ammonium bromide (CTAB) was used as a precursors and capping agent respectively. The Powder X-Ray Diffraction (PXRD) confirms the hexagonal wurtzite structure and Field Emission Scanning Electron Microscopy (FESEM) shows the nanocrystalline nature. FESEM images showed a distribution of spherical particles with the diameter of 5.6–7.8 nm with the mean diameter of 7.1 nm. The change in band gap with size-quantization was investigated by reflectance UV spectroscopy. The functional groups were analyzed by the Fourier Transform Infrared Spectroscopy (FTIR) and elemental composition of the synthesized sample was determined by the EDX analysis.