Synthesis and Characterization of Size Tuned CdS Quantum Dots

Jyotsna Chauhan; Varsha Rani Mehto; Deepika Soni

Abstract

CdS nanoparticles are synthesized using chemical precipitation at room temperature. Cadmium sulfide is one of the most promising materials for solar cells and of great interest for their practical applications in up to electronics and photonics. The optical properties get modified due to the confinement of charge carrier within the nanoparticles. The physical and chemical properties of these nanoparticles are found to be size dependent. The crystallite sizes of cadmium sulfide crystals were estimated from the peaks of XRD. The optical properties of the samples were estimated by UV visible spectroscopy. The functional groups present in the synthesized CdS materials are identified by FTIR analysis. XRD is used to carry out the structural characterization of the nanoparticles. The coloration of the nanoparticles is directly linked to the band gap. The color of the emitted light depends on the size of the quantum dots, the larger the quantum dots size, the redder the light. Keywords: XRD, FTIR, UV, chemical precipitation method