Impact of in situ preparation of CdS filled PVP nano-composite

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2014-09, Vol.130, p.302-308
• Main Authors: Abdelghany, A.M., Abdelrazek, E.M., Rashad, D.S.
• Format: Article
• Language: English
• Subjects: CdS nano-particles; DFT; FTIR; PVP; UV/Vis
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2014.04.049

[Display omitted] •CdS/PVP nanocomposites were prepared by in situ wet chemical precipitation method.•Combined FTIR/DFT study was used to approve the complexation process.•XRD results indicate that CdS were formed with hexagonal phase in the polymeric matrix.•UV–Vis spectra reveal that nano-composite films show quantum confinement effect. Cadmium sulfide nanoparticles filled polyvinyl pyrrolidone (PVP) were prepared by in situ wet chemical precipitation technique. X-ray diffraction (XRD), Fourier transforms infrared spectra (FTIR), transmission electron microscopy (TEM) and ultraviolet–visible (UV/Vis) were used to characterize the prepared nano-composites. Density Function Theory (DFT) was used to approve the complexation process. XRD results indicate appearance of two peaks at about 28.1°, 27.4° corresponds to (101) and (002) planes which suggest hexagonal phase of CdS with lattice constants of 4.14, 6.72Å in the polymeric matrix. UV/Vis spectra reveal that nano-composite films show quantum confinement effect. The absorption showed a shift toward the shorter wavelength (blue shift) with decrease in the concentration of Cd+ ions. Optical band gap and particle size were calculated and is in agreement with the results obtained from TEM data. Transmission electron microscopy shows that the prepared CdS nanoparticles were dispersed and nearly uniform in diameter within the polymeric matrix.