title: Impact of in situ preparation of CdS filled PVP nano-composite.
abstract: 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, 6.72 Å 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.
authors.affiliation: Spectroscopy Department, Physics Division, National Research Center, 12311 Giza, Egypt. Electronic address: a.m_abdelghany@yahoo.com.
authors.forename: A M
authors.initials: AM
authors.lastname: Abdelghany
authors.affiliation: Physics Department, Faculty of Science, Mansoura University, 35516 Mansoura, Egypt.
authors.forename: E M
authors.initials: EM
authors.lastname: Abdelrazek
authors.affiliation: Physics Department, Faculty of Science, Mansoura University, 35516 Mansoura, Egypt.
authors.forename: D S
authors.initials: DS
authors.lastname: Rashad
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D011232:Chemical Precipitation; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles; D010100:Oxygen / Q000737:chemistry; D010316:Particle Size; D011108:Polymers / Q000737:chemistry; D011205:Povidone / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013440:Sulfides / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D019187:Cadmium Compounds; D011108:Polymers; D013440:Sulfides; C034939:cadmium sulfide; D011205:Povidone; D010100:Oxygen
keywords: CdS nano-particles; DFT; FTIR; PVP; UV/Vis