EFFECT OF AGING PERIOD ON THE STRUCTURAL CHARACTERIZATION OF FRESH AND THERMALLY-ANNEALED CdS NANOPARTICLES

摘要

Different samples of CdS nanoparticles capped by cetyltrimethyl ammonium bromide (CTAB) have been prepared under two different aging conditions before filtration via coprecipitation method. A blue shift in the band gap has been observed in the UV-Visible absorption spectra indicating the formation of nanoparticles of size about 8 nm for the samples prepared. Transmission electron micrographs prove the previous result. The nature, thermal-induced phases (RT : 350°C) and their structure as well as surface stability have been investigated using FT-IR, Raman scattering, DSC, XRD and heat stage X-ray diffraction (HSXRD). Analysis of the obtained data reveals that 5 days aging period greatly enhances the stability of the structure of the CdS nanoparticles as well as its surface stability