Synthesis of CdS Nanocrystals Using Polymer Metal Complex as a Single Source Precursor and their Physicochemical Properties

Abstract

Polymeric ligand (TSCF) have been synthesized via polycondansation of thiosemicarbazide with formaldehyde and its polymer metal complex [TSCF-Cd (II)] has been prepared with Cd (II) ion. Two different batches of CdS chalcogenide, semiconductor nanocrystals have been synthesized by hydrothermal treatment of TSCF-Cd (II)] using a glass Q tube reactor at 200 °C and 250 °C, and marked as (CdS)1and (CdS)2respectively. The resultant nanocrystals were characterized by a variety of methods for thier physochemcial properties. The TEM micrographs showed well-defined, close to hexagonal particles, and the lattice fringes in the HRTEM images confirmed their crystalline nature. The sizes of (CdS)1and (CdS)2were 40 and 50 nm respectively but their morphologies were similar. The optical band gap energies (2.52 eV/ 2.48 eV) and photoluminescence peaks (532/534 nm) of the synthesized CdS nanocrystals suggest that they can be promising photocatalysts. The conductivities and the dielectric constants of the CdS nanocrystals were also studied and the activation energy value of (CdS)1and (CdS)2nanocrystals were found to be 0.64 eV and 0.70 eV.