Synthesis and Study of Optical and Structural Properties of Cadmium Sulphide (CdS)

Abstract

Abstract Cadmium sulphide is semiconductor material with magnetic properties, which is used in many sort of electronic devices. The main properties of this material are its high electrical resistance and insulation . The aim of this study is to prepare and study the optical and synthetic properties of cadmium sulphide.four samples of cadmium sulphide with preparation by different molar ( Cd 0.01 S 0.99 / Cd 0.17 S 0.83 / Cd 0.125 S 0.75 and Cd 0.33 S 0.67 ) . Four samples of Cadmium sulphide were prepared using Sol-gel technique. The reason of using this technique is for its purification of fluids being the starting material of the process; it can produce materials with high purity. The optical properties were studied by UV spectrometer. The absorption of the sample from Cadmium sulphide was rapid increased of the a absorption at wavelengths (373 n) crospanding photon energy 3.32 eV, the value of absorption coefficient (α) = 1.554x10 3 cm -1 for all samples in the U.V region(373nm) , this means that the transition must corresponding to a direct electronic transition. The extinction coefficient value (K) at 373 nm for each sample Cd 0.33 S 0.67 is 4.566x10 -5 while for Cd 0.01 S 0.99 sample at the some wavelength equal 2.575 x10 -5 . The infrared spectra of synthesized Cd x S 1-x nano samples powders were recorded by mattson Fourier Transform Infrared Spectrophotometer in the range of 400 to 4000 , the band around 1375 cm −1 is associated with the O-H bending vibration ,and band around 1639 cm −1 .