Synthesis, Modification and Optical Characterization of Co-Cr Layered Double Hydroxide

 Cobalt and chromium based layered double hydroxides (LDHs) have been successfully synthesized by the co-precipitation method at a constant pH of 10. The intercalation of stearic acid (C18H36O2) into CoCr-LDH and preparation of their polymer nanocomposites using two different methods were studied in the paper. The obtained samples were characterized before and after modification by X-ray diffractometry (XRD) and Ultraviolet visible (UV-Vis) spectroscopy. It has been shown that different reaction temperature profoundly affects the band-gaps of inorganic and composite structures.Three optical band gap values (Eg1, Eg2 and Eg3) for the samples obtained before and after modification. Two optical band gap values were estimated in polymer/LDH nanocomposites. The high-value band gaps for CoCr-LDH(100°C)- NBR and CoCr-LDH(100°C)-SA- NBR were determined to be 5.9 eV and 5.7 eV, respectively. The low-value band gaps for CoCr-LDH(100°C)-NBR and CoCr-LDH(100°C)-SA- NBR were determined to be 4.1 eV and 3.25 eV, respectively

Effect of sonication time on the synthesis of the CdS nanoparticle based multiwall carbon nanotube - maleic anhydride-1-octene nanocomposites

Effect of sonication time on the synthesis of the CdS nanoparticles within the matrix obtained through the covalent functionalization of multiwall carbon nanotube (MWCNT) with maleic anhydride (MA) - 1-octene copolymer was investigated. Cadmium chloride and thiourea were used as the raw materials. MWCNTs used for the matrix were synthesized by Catalytic Chemical Vapor Deposition using Fe-Co/Al2O3 as the catalyst. The obtained nanostructures were characterized by FTIR, XRD, Raman spectroscopy, TEM, SEM, TG and UV-Vis spectroscopy. Electrophysical properties of the polymer nanocomposites obtained using different periods of time for sonication were comparably investigated. The average CdS particle diameter was between 3.9-7.9nm as confirmed independently by TEM and XRD. UV-Vis spectroscopy revealed that the obtained nanostructures are appropriate base materials for making optical devices

Effect of sonication time on the synthesis of the CdS nanoparticle based multiwall carbon nanotube – maleic anhydride – 1-octene nanocomposites

ABSTRACTEffect of sonication time on the synthesis of the CdS nanoparticles within the matrix obtained through the covalent functionalization of multiwall carbon nanotube (MWCNT) with maleic anhydride (MA) ? 1-octene copolymer was investigated. Cadmium chloride and thiourea were used as the raw materials. MWCNTs used for the matrix were synthesized by Catalytic Chemical Vapor Deposition using Fe-Co/Al2O3 as the catalyst. The obtained nanostructures were characterized by FTIR, XRD, Raman spectroscopy, TEM, SEM, TG and UV-Vis spectroscopy. Electrophysical properties of the polymer nanocomposites obtained using different periods of time for sonication were comparably investigated. The average CdS particle diameter was between 3.9?7.9 nm as confirmed independently by TEM and XRD. UV-Vis spectroscopy revealed that the obtained nanostructures are appropriate base materials for making optical devices